UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D
                                 (Rule 13d-101)
  Information to be Included in Statements Filed Pursuant to Rule 13d-1(a) and
               Amendments Thereto Filed Pursuant to Rule 13d-2(a)

                    Under the Securities Exchange Act of 1934
                               (Amendment No. 4)*

                         THE HOUSTON EXPLORATION COMPANY
--------------------------------------------------------------------------------
                                (Name of Issuer)

                     Common Stock, par value $ .01 per share
--------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                    44212010
--------------------------------------------------------------------------------
                                 (CUSIP Number)

                               John J. Bishar, Jr.
--------------------------------------------------------------------------------
                     Senior Vice President & General Counsel
                               KeySpan Corporation
                              One MetroTech Center
                            Brooklyn, New York 11201
                                 (718) 403-1000
                                 With a copy to:

                              William R. Dougherty
                         Simpson Thacher & Bartlett LLP
                              425 Lexington Avenue
                            New York, New York 10017
                                 (212) 455-2000
--------------------------------------------------------------------------------
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                  June 2, 2004
--------------------------------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)

     If the filing  person has  previously  filed a statement on Schedule 13G to
report the  acquisition  that is the subject of this Schedule 13D, and is filing
this schedule because of ss.ss.240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check
the following box. |_|

          Note:  Schedules filed in paper format shall include a signed original
     and five copies of the schedule,  including all exhibits.  See ss.240.13d-7
     for other parties to whom copies are to be sent.

          *The  remainder of this cover page shall be filled out for a reporting
     person's  initial  filing on this form with respect to the subject class of
     securities,  and for any subsequent amendment containing  information which
     would alter disclosures provided in a prior cover page.

     The  information  required on the remainder of this cover page shall not be
deemed to be "filed"  for the purpose of Section 18 of the  Securities  Exchange
Act of 1934 ("Act") or otherwise  subject to the  liabilities of that section of
the Act but shall be subject to all other  provisions of the Act  (however,  see
the Notes).




                                                    Page     2        of       8

--------- ----------------------------------------------------------------------
   1      NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON KeySpan Corporation
          I.R.S. Identification No. 11-3431358
--------- ----------------------------------------------------------------------
   2.     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                (a)

                                                                           (b)
--------- ----------------------------------------------------------------------
   3      SEC USE ONLY
--------- ----------------------------------------------------------------------
   4.     SOURCES OF FUNDS*

          Not Applicable
--------- ----------------------------------------------------------------------
   5.     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
          ITEMS 2(d) or 2(e)
--------- ----------------------------------------------------------------------
   6.     CITIZENSHIP OR PLACE OF ORGANIZATION

          New York
--------- ----------------------------------------------------------------------
 NUMBER OF SHARES      7.     SOLE VOTING POWER

BENEFICIALLY OWNED

 BY EACH REPORTING

      PERSON                  6,580,392 (indirectly through KeySpan Energy
                              Corporation and THEC Holdings Corp.)

       WITH
                     -------- --------------------------------------------------
                       8.     SHARED VOTING POWER



                     -------- --------------------------------------------------
                       9.     SOLE DISPOSITIVE POWER


                              6,580,392 (indirectly through KeySpan Energy
                              Corporation and THEC Holdings Corp.)
                     -------- --------------------------------------------------
                       10.    SHARED DISPOSITIVE POWER




-------------------- -------- --------------------------------------------------
  11.     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON


            6,580,392 (indirectly through KeySpan Energy Corporation
            and THEC Holdings Corp.)
--------- ----------------------------------------------------------------------
  12.     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*


--------- ----------------------------------------------------------------------
  13.     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)


                                                          24%
--------- ----------------------------------------------------------------------
  14.     TYPE OF REPORTING PERSON*


                                                          HC
--------- ----------------------------------------------------------------------



                                                               Page   3   of   8


--------- ----------------------------------------------------------------------
   1      NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
          KeySpan Energy Corporation
          I.R.S. Identification No. 11-3344628
--------- ----------------------------------------------------------------------
   2.     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*               (a)

                                                                          (b)
--------- ----------------------------------------------------------------------
   3      SEC USE ONLY
--------- ----------------------------------------------------------------------
   4.     SOURCES OF FUNDS*

          Not Applicable
--------- ----------------------------------------------------------------------
   5.     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
          ITEMS 2(d) or 2(e)
--------- ----------------------------------------------------------------------
   6.     CITIZENSHIP OR PLACE OF ORGANIZATION

          New York
-------------------- -------- --------------------------------------------------
 NUMBER OF SHARES      7.     SOLE VOTING POWER

BENEFICIALLY OWNED

 BY EACH REPORTING

      PERSON                  6,580,392 (indirectly through THEC Holdings Corp.)

       WITH
                     -------- --------------------------------------------------
                       8.     SHARED VOTING POWER



                     -------- --------------------------------------------------
                       9.     SOLE DISPOSITIVE POWER


                              6,580,392 (indirectly through THEC Holdings Corp.)
                     -------- --------------------------------------------------
                       10.    SHARED DISPOSITIVE POWER




--------- ----------------------------------------------------------------------
  11.     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON


                         6,580,392 (indirectly through THEC Holdings Corp.)
--------- ----------------------------------------------------------------------
  12.     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*


--------- ----------------------------------------------------------------------
  13.     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)


                                                          24%
--------- ----------------------------------------------------------------------
  14.     TYPE OF REPORTING PERSON*


                                                          CO
--------- ----------------------------------------------------------------------









                                                               Page   4   of   8


--------- ----------------------------------------------------------------------
   1      NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
          THEC Holdings Corp.
          I.R.S. Identification No. 76-0489610
--------- ----------------------------------------------------------------------
   2.     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*             (a)

                                                                        (b)
--------- ----------------------------------------------------------------------
   3      SEC USE ONLY
--------- ----------------------------------------------------------------------
   4.     SOURCES OF FUNDS*

          Not Applicable
--------- ----------------------------------------------------------------------
   5.     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
          ITEMS 2(d) or 2(e)
--------- ----------------------------------------------------------------------
   6.     CITIZENSHIP OR PLACE OF ORGANIZATION

          Delaware
--------- ----------------------------------------------------------------------
 NUMBER OF SHARES      7.     SOLE VOTING POWER

BENEFICIALLY OWNED

 BY EACH REPORTING

      PERSON                                       6,580,392

       WITH
                     -------- --------------------------------------------------
                       8. SHARED VOTING POWER



                     -------- --------------------------------------------------
                       9. SOLE DISPOSITIVE POWER


                                                    6,580,392
                     -------- --------------------------------------------------
                       10. SHARED DISPOSITIVE POWER




--------- ----------------------------------------------------------------------
  11.     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON


                                             6,580,392
--------- ----------------------------------------------------------------------
  12.     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*


--------- ----------------------------------------------------------------------
  13.     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)


                                              24%
--------- ----------------------------------------------------------------------
  14. TYPE OF REPORTING PERSON*


                                              CO
--------- ----------------------------------------------------------------------






                                                               Page   5   of   8


Item 1.  Security and Issuer

         Item 1 is hereby amended and restated as follows:

     This  Amendment  No. 4 (the  "Amendment")  to Schedule  13D relating to the
Common  Stock,  par value $0.01 per share (the "Common  Stock"),  of The Houston
Exploration  Company, a Delaware  corporation (the "Issuer") is filed by KeySpan
Corporation  (f/k/a  BL  Holding  Corp.),  a New York  corporation  ("KeySpan"),
KeySpan Energy Corporation,  a New York corporation  ("KEC"),  and THEC Holdings
Corp.,  a Delaware  corporation  ("THEC"  and,  together  with  KeySpan and KEC,
"Reporting  Persons"),  to further  amend the Schedule  13D that was  previously
filed on October 8, 1997 and amended by Amendment No. 1 thereto,  filed on April
7, 2000,  Amendment  No. 2 thereto,  filed on March 3, 2003 and  Amendment No. 3
thereto,  filed on May 24, 2004.  Unless  otherwise  indicated,  all capitalized
terms used but not defined in this  Amendment have the same meaning as set forth
in the Schedule 13D as previously  amended.  The principal  executive offices of
the Issuer are located at 1100 Louisiana, Suite 2000, Houston, Texas 77002-5219.

Item 4.  Purpose of Transaction

         Item 4 is hereby amended and restated as follows:

     On June 2, 2004,  KeySpan  successfully  completed an exchange  transaction
with the Issuer valued at $449 million,  which reduced THEC's ownership interest
in the Issuer from approximately 55% to 24%.

     Under the terms of the  transaction,  THEC exchanged  10,800,000  shares of
Common Stock for all of the stock of Seneca-Upshur  Petroleum, Inc ("Seneca"), a
wholly owned subsidiary of the Issuer.  In connection with the transaction,  the
Issuer  retired  4.6 million  shares and issued 6.2  million  shares in a public
offering.

     Based on the Issuer's  announced  offering  price of $48.00 per share,  the
shares of Common Stock  exchanged in the  transaction  were valued at $41.57 per
share.  Seneca's assets consist of Appalachian Basin producing properties valued
at $60.0 million and $389.0 million in cash. At December 31, 2003, the producing
properties  had proved  reserves  of 50.5  billion  cubic  feet of  natural  gas
equivalent (Bcfe), or approximately 7% of Issuer's total proved reserves.

     KeySpan  now owns  6,580,392  shares,  or  approximately  24%,  of Issuer's
outstanding  Common Stock. In addition,  KeySpan reduced its  representation  on
Issuer's Board of Directors to two directors  from five and the Chief  Executive
Officer of KeySpan no longer serves as Chairman of the Board of Directors of the
Issuer.

     In addition,  KeySpan  entered into an underwriting  agreement  pursuant to
which it agreed, among other things, not to transfer,  without the prior written
consent of the  underwriters  and subject to certain  exceptions,  any shares of
Common  Stock during the period  ending 90 days after May 26, 2004,  the date of
the  prospectus  supplement  relating to the offering of shares of Common Stock.
Under the terms of the  Distribution  Agreement  (as defined  below),  THEC also
agreed that,  for a period of three years,  it would not increase its  ownership
interest in the Issuer above 24% of the Issuer's issued and  outstanding  Common
Stock.

     The preceding  summary of the  transactions  is not intended to be complete
and  is  qualified  in  its  entirety  by  reference  to the  full  text  of the
Distribution Agreement, by and among the Issuer, Seneca, THEC and KeySpan, dated
as of June 2, 2004, a copy of which is filed as Exhibit 10 hereto,  and which is
incorporated herein by reference.

     KeySpan,  KEC and THEC intend to review the performance of their investment
in the Issuer from time to time.  Depending on various  factors,  including  the
business,  prospects  and  financial  position  of the  Issuer,  the current and



                                                               Page   6   of   8



anticipated  future  price levels of the Common  Stock,  the  conditions  in the
securities markets and general economic and industry conditions,  as well as the
benefits of diversification and the other investment  opportunities available to
them,  KeySpan,  KEC and THEC will  take  such  actions  with  respect  to their
investment in the Issuer as they deem appropriate in light of the  circumstances
existing from time to time.  Subject to the terms of the agreements entered into
in connection with the  transactions as described above,  KeySpan,  KEC and THEC
may  purchase  additional  equity in the Issuer or may dispose of some or all of
their holdings in the open market,  in public offerings,  in private  negotiated
transactions or in other transactions, including derivative transactions.

     Other than as described above, none of KeySpan,  KEC and THEC has any plans
or proposals  that relate to or would result in any of the actions  described in
subparagraphs (a) through (j) of Item 4 of Schedule 13D (although  KeySpan,  KEC
and THEC reserve the right to develop such plans).

Item 5.  Interest in Securities of the Issuer

         Item 5 is hereby amended and restated as follows:

     (a) As of the date  hereof,  THEC  beneficially  owns,  and KeySpan and KEC
beneficially  own  indirectly  through THEC,  6,580,392  shares of Common Stock,
representing  approximately 24% of the total outstanding  shares of Common Stock
(based on  31,854,155  shares of Common  Stock  outstanding  as  reported in the
Issuer's  Quarterly  Report on Form 10-Q filed with the  Securities and Exchange
Commission on May 7, 2004).

     (b) THEC has, and KeySpan and KEC each have  indirectly  through THEC, sole
power to vote or direct the vote and to dispose  or direct  the  disposition  of
shares of Common Stock owned by it.

     (c) See response to Item 4 above.

     (d) Not applicable.

     (e) Not applicable.

Item 6. Contracts, Arrangements, Understandings or Relationships with Respect to
Securities of the Issuer

         Item 6 is hereby amended and restated as follows:

     As of June 2,  2004,  Robert B.  Catell,  the Chief  Executive  Officer  of
KeySpan and KEC,  who also serves as director to KeySpan and KEC, and Stephen W.
McKessey,  who also serves as a director of KeySpan,  will  continue to serve as
directors of the Issuer. For as long as THEC has the right to appoint members to
the board of the Issuer,  the Issuer has agreed to cause the board to consist at
all times of not more than nine  directors.  At any time THEC and its affiliates
hold at least 10% of the issued and  outstanding  Common Stock,  THEC shall have
the right to designate two members of the slate of directors  being  proposed by
the Issuer to be elected to the board.  At any time THEC and its affiliates hold
Common  Stock  constituting  less than 10% but greater than 5% of the issued and
outstanding Common Stock, THEC shall have the right to appoint one member of the
slate of directors being proposed by the Issuer to be elected to the board. Once
THEC and its affiliates hold Common Stock  constituting 5% or less of the issued
and outstanding Common Stock, THEC will not have the right to appoint members to
any slate of directors being proposed by the Issuer to be elected to the board.

     In addition,  KeySpan  entered into an underwriting  agreement  pursuant to
which it agreed, among other things, not to transfer,  without the prior written
consent of the  underwriters  and subject to certain  exceptions,  any shares of
Common Stock during the period  ending 90 days after the date of the  prospectus
supplement  relating to the offering of shares of Common Stock.  Pursuant to the
Distribution  Agreement,  THEC also agreed that, for a period of three years, it
would  not  increase  its  ownership  interest  in the  Issuer  above 24% of the
Issuer's issued and outstanding Common Stock.


                                                               Page   7   of   8


     Pursuant to the Distribution Agreement,  the Issuer has agreed that for the
period  from June 2, 2004 and ending on August 15,  2004,  the Issuer  will not,
directly  or  indirectly,  offer for sale,  sell,  or issue any shares of Common
Stock (other than Common Stock issued pursuant to employee arrangements or stock
options existing on June 2, 2004).

     THEC and the Issuer  entered  into an  Amended  and  Restated  Registration
Rights  Agreement,   dated  as  of  June  2,  2004,  (the  "Registration  Rights
Agreement") amending and restating the existing registration agreement, dated as
of July 2, 1996. The Registration  Rights Agreement provides that (i) the Issuer
will  use  commercially  reasonable  efforts  to  keep  its  shelf  registration
statement on Form S-3,  effective March 31, 2004 (No.  333-113659)  continuously
effective  until the earlier of (x) the date which is eighteen  months from June
2, 2004 and (y) such date as all  shares  of  Common  Stock  held by THEC may be
immediately  sold under Rule 144 under the  Securities  Act of 1933,  as amended
(the  "Securities  Act")  during  any 90 day  period and (ii) THEC will have the
right to make two demands  ("Demands")  to the Issuer to register  Common  Stock
held by it in a public  offering  pursuant to the Securities Act, so long as the
shares  being  registered  represent  no less  than 10% of the then  issued  and
outstanding Common Stock.  Demand  registrations are subject to the right of the
Issuer to delay the exercise by THEC of the right for a period of up to 180 days
if, in the Issuer's good faith judgment,  that it is in the best interest of the
Issuer to defer the filing. Pursuant to the Registration Rights Agreement,  THEC
also  has  the  right  to  "piggyback"  or  include  its  Common  Stock  in  any
registration of Common Stock made by the Issuer.

     Expenses  incurred in connection with a Demand  registration are to be paid
by THEC. The Issuer agreed to indemnify THEC, its officers,  directors,  agents,
any  underwriter,  and each person  controlling  any of the  foregoing,  against
certain liabilities under the Securities Act or the securities laws of any state
or  country  in  which  securities  of  the  Issuer  are  sold  pursuant  to the
Registration Rights Agreement.

     The Distribution  Agreement and the Registration Rights Agreement are filed
as exhibits hereto and are hereby incorporated by reference into this Item 6.

     Except as described in this Schedule 13D, or in the exhibits  hereto,  none
of KeySpan,  KEC or THEC, nor, to the best knowledge and belief of KeySpan,  KEC
and THEC, any of their respective directors or executive officers, is a party to
any other contract,  arrangement,  understanding or relationship with respect to
any  securities  of the Issuer,  except that Mr.  Cattel and Mr.  McKessey  have
interests in stock  options  granted by the Issuer for  compensation  related to
their service as directors of the Issuer.  Mr.  McKessey also receives an annual
retainer  and meeting  fees  associated  with his  services as a director of the
Issuer.

Item 7. Material to Be Filed as Exhibits

         Item 7 is hereby amended by adding the following text:

          9.   Joint Filing  Agreement,  dated June 3, 2004 among the  Reporting
               Persons  relating to the filing of a joint  statement on Schedule
               13D.

          10.  Distribution  Agreement,  dated as of June 2, 2004,  by and among
               The Houston Exploration Company,  Seneca-Upshur Petroleum,  Inc.,
               THEC Holding Corp, and KeySpan Corporation

          11.  Amended and Restated  Registration Rights Agreement,  dated as of
               June 2, 2004 by and among The  Houston  Exploration  Company  and
               THEC Holdings Corp.





                                                               Page   8   of   8



                                    Signature

     After  reasonable  inquiry and to the best of our knowledge  and belief,  I
certify that the information  set forth in this statement is true,  complete and
correct.

         Date: June 4, 2004



                     KEYSPAN CORPORATION

                     By:    /s/Michael J. Taunton
                     Name:  Michael J. Taunton
                     Title: Senior Vice President and Treasurer



                     KEYSPAN ENERGY CORPORATION

                     By:    /s/Michael J. Taunton
                     Name:  Michael J. Taunton
                     Title: Senior Vice President and Treasurer



                      THEC HOLDINGS CORP.

                      By:    /s/Saiyed Zain Mirza
                      Name:  Saiyed Zain Mirza
                      Title: Senior Vice President and Chief Financial Officer













                                INDEX OF EXHIBITS

Number        Description

     9    Joint  Filing  Agreement,  dated  June 3,  2004,  among the  Reporting
          Persons relating to the filing of a joint statement on Schedule 13D.

     10   Distribution  Agreement,  dated as of June 2,  2004,  by and among The
          Houston  Exploration  Company,  Seneca-Upshur  Petroleum,  Inc.,  THEC
          Holding Corp, and KeySpan Corporation.

     11   Amended and Restated  Registration Rights Agreement,  dated as of June
          2, 2004 by and among The Houston Exploration Company and THEC Holdings
          Corp.







                                                                       Exhibit 9

                             JOINT FILING AGREEMENT

     In accordance with Rule 13d-1(k)  promulgated under the Securities Exchange
Act of 1934, as amended,  the undersigned  hereby agree to the joint filing with
all  other  Reporting  Persons  (as such term is  defined  in the  Schedule  13D
referred  to below) on behalf of each of them of a  Statement  on  Schedule  13D
(including amendments thereto) with respect to the Common Stock, par value $0.01
per share, of The Houston Exploration Company, a Delaware corporation,  and that
this  Agreement  may be  included  as an  Exhibit  to such  joint  filing.  This
Agreement may be executed in any number of  counterparts,  all of which together
shall constitute one and the same instrument.


     IN WITNESS WHEREOF, the undersigned hereby execute this Agreement as of the
4th day of June 2004.

                     KEYSPAN CORPORATION

                     By:    /s/Michael J. Taunton
                     Name:  Michael J. Taunton
                     Title: Senior Vice President and Treasurer



                     KEYSPAN ENERGY CORPORATION

                     By:    /s/Michael J. Taunton
                     Name:  Michael J. Taunton
                     Title: Senior Vice President and Treasurer



                      THEC HOLDINGS CORP.

                      By:    /s/Saiyed Zain Mirza
                      Name:  Saiyed Zain Mirza
                      Title: Senior Vice President and Chief Financial Officer



                                       




                                                                     Exhibit 10




                             DISTRIBUTION AGREEMENT


                                  by and among


                         THE HOUSTON EXPLORATION COMPANY

                            (a Delaware corporation),



                          SENECA-UPSHUR PETROLEUM, INC.

                         (a West Virginia corporation),



                               THEC HOLDINGS CORP.

                            (a Delaware corporation)



                                       and



                               KEYSPAN CORPORATION

                            (a New York corporation)




                          Effective as of June 2, 2004


--------------------------------------------------------------------------------






                                TABLE OF CONTENTS

                                                                            Page


Article I.            CERTAIN DEFINITIONS AND OTHER MATTERS...................1
   Section 1.1        Certain Definitions.....................................1
   Section 1.2        Terms Defined in Other Sections........................10
   Section 1.3        Interpretation and Rules of Construction...............12

Article II.           DISTRIBUTION OF STOCK; CLOSING.........................12
   Section 2.1        Distribution of Stock..................................12
   Section 2.2        Closing................................................12
   Section 2.3        THX's Deliveries at the Closing........................12
   Section 2.4        THEC's Deliveries at the Closing.......................13

Article III.          REORGANIZATION.........................................13
   Section 3.1        Contribution...........................................13
   Section 3.2        Assets and Liabilities.................................13
   Section 3.3        Assignment of Contracts and Rights.....................15

Article IV.           REPRESENTATIONS AND WARRANTIES OF THX..................16
   Section 4.1        Organization and Qualification.........................16
   Section 4.2        Capitalization.........................................16
   Section 4.3        Authorization..........................................17
   Section 4.4        Consents and Approvals; No Violation...................17
   Section 4.5        Lease Operating Statements.............................17
   Section 4.6        Financial Information; No Undisclosed Liabilities......17
   Section 4.7        Bank Account Information...............................18
   Section 4.8        Litigation.............................................18
   Section 4.9        Licenses; Approvals....................................18
   Section 4.10       Labor Matters..........................................18
   Section 4.11       Compliance with Laws...................................19
   Section 4.12       Insurance..............................................19
   Section 4.13       Contracts..............................................19
   Section 4.14       Environmental Matters..................................19
   Section 4.15       Real Property..........................................20
   Section 4.16       Employee Benefit Plans.................................20
   Section 4.17       Non-Foreign Representation.............................22
   Section 4.18       Reserve Report.........................................22
   Section 4.19       Title..................................................23
   Section 4.20       Sufficiency of Assets..................................23
   Section 4.21       No Sale of EnerVest Assets.............................23
   Section 4.22       Financing..............................................23
   Section 4.23       Condition of Personal Property.........................23
   Section 4.24       Brokerage Fees and Commissions.........................23
   Section 4.25       No Hedges..............................................23
   Section 4.26       Disclaimers............................................23

                                      -i-

                                                                            Page

Article V.            REPRESENTATIONS AND WARRANTIES OF THEC AND KEYSPAN.....24
   Section 5.1        Organization...........................................24
   Section 5.2        Authorization..........................................25
   Section 5.3        Consents and Approvals; No Violation...................25
   Section 5.4        THEC THX Shares........................................25
   Section 5.5        Litigation.............................................25
   Section 5.6        Acquisition of Seneca-Upshur Shares for Investment.....26
   Section 5.7        Acknowledgements.......................................26

Article VI.           COVENANTS AND AGREEMENTS...............................26
   Section 6.1        Employee Matters.......................................26
   Section 6.2        Further Assurances.....................................28
   Section 6.4        Confidentiality; Access to Records.....................29
   Section 6.5        THX Shares Retained by THEC............................30
   Section 6.6        Intercompany Accounts and Bank Debt....................30
   Section 6.7        THX Compliance with Underwriting Agreement.............31
   Section 6.8        Governance.............................................31
   Section 6.9        Issuances of THX Common Stock..........................31
   Section 6.10       Insurance..............................................32

Article VII.          TAX MATTERS............................................32

Article VIII.         CONDITIONS TO CLOSING..................................32
   Section 8.1        Mutual Conditions......................................32
   Section 8.2        Conditions to THEC's and KeySpan's Obligations.........32
   Section 8.3        Conditions to THX's and Seneca-Upshur's Obligations....33

Article IX.           TERMINATION............................................34
   Section 9.1        Termination............................................34
   Section 9.2        Effect of Termination..................................35

Article X.            SURVIVAL OF REPRESENTATIONS AND WARRANTIES;
                        INDEMNIFICATION......................................35
   Section 10.1       Survival of Representations and Warranties.............35
   Section 10.2       Indemnification by THX.................................35
   Section 10.3       Indemnification by THEC and KeySpan....................36
   Section 10.4       Definition of Damage; Determination of
                        Indemnification......................................37
   Section 10.5       Notice.................................................37
   Section 10.6       Third Party Claim......................................38
   Section 10.7       Exclusivity............................................40

Article XI.           MISCELLANEOUS..........................................40
   Section 11.1       Notices................................................40
   Section 11.2       Governing Law; Consent to Jurisdiction.................41
   Section 11.3       Waiver of Jury Trial...................................42

                                      -ii-


                                                                            Page

   Section 11.4       Assignment; Successors and Assigns;
                        No Third Party Rights................................42
   Section 11.5       Counterparts...........................................42
   Section 11.6       Titles and Headings....................................42
   Section 11.7       Entire Agreement.......................................42
   Section 11.8       Amendment and Modification.............................42
   Section 11.9       Publicity; Public Announcements........................43
   Section 11.10      Waiver.................................................43
   Section 11.11      Severability...........................................43
   Section 11.12      No Strict Construction.................................43
   Section 11.13      Knowledge..............................................43
   Section 11.14      Affiliate Status.......................................43
   Section 11.15      No Third Party Beneficiaries...........................43
   Section 11.16      Specific Performance...................................43
   Section 11.17      Expenses...............................................44


EXHIBITS

Exhibit A         Asset Contribution Agreement
Exhibit B         Amended and Restated Registration Rights Agreement
Exhibit C         Tax Matters Agreement
Exhibit D         Transition Services Agreement
Exhibit E         Business Employees
Exhibit F         THX Change-of-Control Plan




















                                     -iii-


                             DISTRIBUTION AGREEMENT

     This DISTRIBUTION  AGREEMENT,  dated as of June 2, 2004 (this "Agreement"),
is entered into by and among THE HOUSTON EXPLORATION COMPANY ("THX"), a Delaware
corporation  having its  principal  place of business at 1100  Louisiana,  Suite
2000, Houston, Texas, 77002, SENECA-UPSHUR PETROLEUM, INC. ("Seneca-Upshur"),  a
West  Virginia  corporation  and a wholly owned  subsidiary  of THX,  having its
principal  place of business at 1100  Louisiana,  Suite  2000,  Houston,  Texas,
77002, THEC HOLDINGS CORP. ("THEC"), a Delaware corporation having its principal
place of business at One Metrotech Center,  Brooklyn,  New York 11201-3850,  and
KEYSPAN CORPORATION  ("KeySpan"),  a New York corporation and the parent company
of THEC,  having  its  principal  place of  business  at One  Metrotech  Center,
Brooklyn, New York 11201-3850.

                              W I T N E S S E T H:

     WHEREAS,  THX operates  (directly and indirectly  through  Seneca-Upshur) a
business  consisting of the exploration  for, and development and production of,
natural  gas in the  states  of West  Virginia,  Pennsylvania  and New York (the
"Business");

     WHEREAS,  KeySpan,  through  THEC,  owns  17,380,392  of  THX's  31,888,945
outstanding shares of common stock;

     WHEREAS,  THX,  THEC  and  KeySpan  intend  that (a) the  Contribution  and
Distribution  qualify  under  Sections  355 and  368 of the  Code  and (b)  this
Agreement constitutes a plan of reorganization as the term is defined in Section
368 of the Code; and

     WHEREAS,  the boards of directors of THX,  THEC and KeySpan  have,  in each
case,  determined  that  it  is  in  the  best  interests  of  their  respective
corporations to enter into this Agreement;

     NOW, THEREFORE,  in consideration of the mutual covenants contained in this
Agreement,  and  intending  to be legally  bound,  the parties  hereto  agree as
follows:

                                   Article I.
                      CERTAIN DEFINITIONS AND OTHER MATTERS

     Section 1.1       Certain Definitions.

     As used in this  Agreement and the schedules  hereto,  the following  terms
have the respective meanings set forth below.

     "Action"  means any  administrative,  regulatory,  judicial or other formal
proceeding  or  investigation  by  or  before  any  Governmental   Authority  or
arbitrator.

     "Affiliate"  means,  with respect to any Person,  any other Person that, at
the relevant time, directly or indirectly,  through one or more  intermediaries,
controls,  is controlled by, or is under common control with,  such Person.  The
term "control"  means the  possession,  directly or indirectly,  of the power to



direct  or cause the  direction  of the  management  and  policies  of a Person,
whether  through the ownership of voting  securities or general  partnership  or
managing member  interests,  by contract or otherwise,  including the ability to
elect the members of the board of directors or other governing body of a Person,
and the terms  "controlled" and  "controlling"  have correlative  meanings.  For
purposes  of  this  Agreement,  THEC  and  KeySpan  shall  be  deemed  not to be
"Affiliates"  of  THX  or  any  of  its  subsidiaries  and  THX  or  any  of its
subsidiaries  shall  be  deemed  not to be an  "Affiliate"  of THEC or  KeySpan;
provided,  however,  that  following  the  Closing,  Seneca-Upshur  shall  be an
"Affiliate" of THEC and KeySpan and shall not be an "Affiliate" of THX.

     "Ancillary Agreements" means the agreements to be entered into by and among
THX and/or its  Affiliates  (other  than  Seneca-Upshur),  on the one hand,  and
Seneca-Upshur,  THEC and/or KeySpan,  on the other hand,  concurrently with this
Agreement,  including,  but not limited to the Tax Matters Agreement,  the Asset
Contribution  Agreement,  the Transition Services Agreement and the Registration
Rights Agreement.

     "Asset Contribution Agreement" means the Asset Contribution Agreement dated
as of June 2, 2004 by and  between  THX and  Seneca-Upshur  with  respect to the
contribution  to  Seneca-Upshur  of the  Contributed  Business  Assets  and  the
assumption by Seneca-Upshur of the Contributed Business Liabilities, in the form
attached hereto as Exhibit A.

     "Business Contracts" means all Contracts,  as defined in and contributed to
Seneca-Upshur   pursuant   to  the  Asset   Contribution   Agreement,   and  all
Seneca-Upshur Contracts.

     "Business Day" means a day other than Saturday or Sunday on which banks are
open for business in New York, New York.

     "Business   Employees"   means   individuals  who  provide   employment  or
employment-type  services primarily to the Business as of the date hereof,  each
of whom is listed in Section 1.1 of THX's Disclosure Schedule.

     "Business  Fee  Mineral  Interests"  means the Fee  Mineral  Interests,  as
defined in and contributed to Seneca-Upshur  pursuant to the Asset  Contribution
Agreement, and the Seneca-Upshur Fee Mineral Interests.

     "Business  Leases"  means all  Leases,  as  defined in and  contributed  to
Seneca-Upshur   pursuant   to  the  Asset   Contribution   Agreement,   and  all
Seneca-Upshur Leases.

     "Business Surface Agreements" means all Surface  Agreements,  as defined in
and contributed to Seneca-Upshur  pursuant to the Asset Contribution  Agreement,
and all Seneca-Upshur Surface Agreements.

     "Cash Amount" means an amount in cash equal to $388,979,250.

     "CERCLA" means the Comprehensive  Environmental Response,  Compensation and
Liability Act, as amended.

     "Claims"  means any and all (a)  claims,  (b)  demands,  (c) suits,  or (d)
causes of action (in the case of clause (d),  relating to or  resulting  from an
Action).

                                       2


     "Code" means the Internal Revenue Code of 1986, as amended.

     "Confidential  Business  Information"  shall  mean  financial  information,
customer lists,  supplier lists,  pricing and cost information,  operating data,
reserve  reports,  projections,  business and marketing  plans and proposals and
other proprietary business information of or relating to the Business.

     "Contract"  means any contract,  agreement,  lease,  license,  sales order,
purchase order,  indenture,  note, bond, loan, instrument,  lease, commitment or
other  arrangement or agreement that is binding on any Person or any part of its
assets or properties under applicable Law.

     "Contributed Business Assets" means all of the Interests, as defined in the
Asset Contribution Agreement.

     "Contributed  Business Contracts" means collectively all of the Contributed
Contracts  and  Surface  Agreements  (each as defined in the Asset  Contribution
Agreement)  contributed  to  Seneca-Upshur  pursuant  to the Asset  Contribution
Agreement.

     "Contributed Business Equipment" means all of the Equipment,  as defined in
and contributed to Seneca-Upshur pursuant to the Asset Contribution Agreement.

     "Contributed  Business  Liabilities"  means the  obligations,  liabilities,
debts and commitments  assumed by  Seneca-Upshur  pursuant to Section 6.2 of the
Asset Contribution Agreement.

     "Defensible  Title"  means such  record  and  beneficial  right,  title and
interest in and to such property that:

               1.1.1 entitles  Seneca-Upshur  to a net revenue  interest in such
          property  not less  than the net  revenue  interest  set  forth in the
          Reserve Report for such property,  without reduction,  suspension,  or
          diminution throughout the intended duration of the estate constituting
          such  property,  except as shown in the  Reserve  Report or in Section
          4.18.1 of THX's  Disclosure  Schedule.  Changes  or  adjustments  that
          result solely from the  establishment  of units or changes in existing
          units (or the  participating  areas  therein)  shall not  constitute a
          change in the net revenue interest;

               1.1.2  subjects  Seneca-Upshur  to a  working  interest  in  such
          property that is no greater than the record title or operating  rights
          interest set forth in the Reserve  Report for such  property,  without
          increase  throughout the intended duration of the estate  constituting
          such  property,  except as shown in the  Reserve  Report or in Section
          4.18.1 of THX's  Disclosure  Schedule.  Changes  or  adjustments  that
          result solely from the  establishment  of units or changes in existing
          units (or the  participating  areas  therein)  shall not  constitute a
          change in the working interest; and

               1.1.3 has no Encumbrances other than Permitted Encumbrances.

         "Effective Time" means 12:01 am Eastern Daylight Time on June 1, 2004.

                                       3


     "Encumbrances"  means security interests,  liens,  Claims,  charges,  title
defects,  deficiencies or exceptions (including,  with respect to Real Property,
defects,  deficiencies or exceptions in, or relating to, marketability of title,
or leases,  subleases or the like affecting title),  mortgages,  deeds of trust,
pledges, easements, encroachments, restrictions on use, rights-of-way, rights of
first refusal, conditional sales or other title retention agreements, covenants,
conditions or other similar restrictions (including restrictions on transfer).

     "EnerVest  Agreement"  means the Purchase and Sale Agreement dated December
1, 2003 by and between EnerVest East Limited Partnership and THX.

     "Environmental  Laws"  means  any  Law  governing  or  relating  to (a) the
environment,  (b)  Releases  or  threatened  Releases of  Regulated  Substances,
including  investigations,  monitoring and abatement of such  Releases,  (c) the
manufacture,  handling,  transport,  use,  treatment,  storage  or  disposal  of
Regulated  Substances  or  materials  containing  Regulated  Substances  or  (d)
protection  of human  health or safety (to the extent  related  to  exposure  to
Regulated  Substances),  including  the  Comprehensive  Environmental  Response,
Compensation,  and  Liability  Act of 1980,  as amended  (42 U.S.C.  ss. 9601 et
seq.); the Hazardous Material Transportation Act, as amended (42 U.S.C. ss. 1801
et seq.); the Resource  Conservation and Recovery Act, as amended (42 U.S.C. ss.
6901 et seq.);  the Toxic  Substances  Control  Act, as amended  (15 U.S.C.  ss.
2601); the Clean Air Act, as amended (42 U.S.C. ss. 7401 et seq.); the Emergency
Planning and  Community  Right-to-Know  Act, as amended (42 U.S.C.  ss. 11001 et
seq.); the Occupational  Safety and Health Act, as amended (29 U.S.C. ss. 651 et
seq.); the Safe Drinking Water Act, as amended (42 U.S.C. ss. 300f et seq.); the
Federal Water  Pollution  Control Act, as amended (33 U.S.C.  ss. 1251 et seq.);
and state  equivalents of these  Environmental  Laws or regulations  promulgated
pursuant to any of said Environmental Laws.

     "Environmental  Permit" means any  registration,  approval,  identification
number,  License,  notice, permit,  exemption,  or other authorization or filing
required under or issued pursuant to any applicable Environmental Law.

     "Equity  Offering"  means  the  offering  and sale by THX of  shares of THX
Common Stock pursuant to the Underwriting  Agreement,  the net proceeds of which
offering shall comprise a portion of the Cash Amount.

     "ERISA"  means the Employee  Retirement  Income  Security  Act of 1974,  as
amended.

     "Exchange Act" means the Securities Exchange Act of 1934, as amended.

     "GAAP" means United  States  generally  accepted  accounting  principles in
effect from time to time applied consistently throughout the relevant periods.

     "Governmental Authority" means any national, supranational, federal, state,
municipal or local  government,  foreign or domestic,  or the  government of any
political subdivision of any of the foregoing, or any entity, authority, agency,
ministry or other  similar body  exercising  executive,  legislative,  judicial,
regulatory  or  administrative  authority  or  functions  of  or  pertaining  to
government,   including  any  authority  or  other   quasi-governmental   entity
established by a Governmental Authority to perform any of such functions.


                                       4


     "Hydrocarbons"  means  all  merchantable  oil,  gas,  liquid  hydrocarbons,
liquefiables,  condensate and distillate that have been produced from any assets
of Seneca-Upshur.

     "Indebtedness"  means  (a)  indebtedness  for  borrowed  money  or for  the
deferred  purchase  price of  property or services  (other  than  current  trade
liabilities  incurred  in  the  ordinary  course  of  business  and  payable  in
accordance  with customary  practices),  including  indebtedness  evidenced by a
note, bond, debenture or similar instrument;  (b) guarantees or other contingent
obligations  in respect of items in clause (a); (c)  obligations  required to be
classified  and accounted  for as capital  leases on a balance sheet under GAAP;
(d)  obligations in respect of outstanding  letters of credit,  acceptances  and
similar  obligations  created for the account of such  Person;  (e)  liabilities
under interest rate cap Contracts,  interest rate swap  Contracts,  gas or other
commodity  hedges and  similar  Contracts;  and (f) to the extent not  otherwise
included in the foregoing, any financing of accounts receivable or inventory.

     "Independent  Engineers" means  Netherland,  Sewell & Associates,  Inc. and
Miller and Lents, Ltd., independent petroleum engineering consultants.

     "Insurance  Policies"  means each insurance  policy (other than relating to
employee  benefit  plans) which,  as of the date hereof,  is maintained by or on
behalf of or provides coverage  primarily to (a)  Seneca-Upshur  with respect to
the Business Assets or (b) the Business.

     "IRS" means the Internal Revenue Service of the United States of
America.

     "Laws"  means all United  States  federal,  state or local or foreign  laws
(including common law),  constitutions,  statutes,  codes,  rules,  regulations,
ordinances,   executive  orders,  decrees,  edicts,   guidelines,   governmental
restrictions  or  other  legally  enforceable  requirements  of  a  Governmental
Authority.

     "Liabilities"  means  any  and  all  debts,  liabilities,  commitments  and
obligations, whether or not fixed, contingent or absolute, matured or unmatured,
direct or indirect,  liquidated or unliquidated,  accrued or unaccrued, known or
unknown, whether or not required by GAAP to be reflected in financial statements
or disclosed in the notes thereto.

     "Material   Adverse  Effect"  means  any  change,   effect,   circumstance,
condition,  event,  occurrence  or state  of facts  which  would  reasonably  be
expected to be  materially  adverse to the  business,  operations  or  condition
(financial or otherwise) of Seneca-Upshur or the Business,  taken as a whole, or
that would prevent or delay, in any material respect, the consummation by THX or
its  Affiliates of the  transactions  contemplated  by this  Agreement,  the Tax
Matters  Agreement and the other  Ancillary  Agreements,  other than any change,
effect, event,  occurrence or state of facts (a) that is generally applicable in
the economy of the United States, (b) generally  affecting the industry in which
THX  and  Seneca-Upshur  operate,  so  long  as THX  and  Seneca-Upshur  are not
disproportionately  affected  thereby,  or (c) relating to the  announcement  or
disclosure of this Agreement or of the transactions contemplated hereby. For the
avoidance of doubt, in the definition of Material Adverse Effect,  references to
Seneca-Upshur will be deemed to be references to Seneca-Upshur  Petroleum,  Inc.
after giving effect to the Business Contribution (but for the avoidance of doubt
before giving effect to the  contribution  of the Cash Amount) and references to


                                       5


the Business  will be deemed to be  references  to the business  operated by THX
consisting of the  exploration  for, and  development and production of, natural
gas in the states of West Virginia,  Pennsylvania  and New York,  without taking
into account the contribution of the Cash Amount into the Business.

         "Permitted Encumbrances" means:

               1.1.4  royalties,  overriding  royalties and division  orders and
          sales contracts  containing terms and provisions  covering gas, oil or
          associated liquid or gaseous hydrocarbons,  reversionary interests and
          similar burdens if the net cumulative  effect of such burdens does not
          operate to reduce  the net  revenue  interest  of any  property  to an
          amount less than the net  revenue  interest  for such  property as set
          forth in the Reserve Report;

               1.1.5 (a) calls on  production  which  entitle  Seneca-Upshur  to
          receive  a  current  market  price  for  such  substance  or  (b)  (i)
          preferential  rights to purchase the  property,  (ii)  required  third
          party consents to assignments and (iii) similar agreements, in each of
          clause  (i),  (ii) or (iii)  prior to Closing  (1) waivers or consents
          have been obtained from the appropriate  parties,  (2) the appropriate
          time period for asserting such rights has expired  without an exercise
          of such  rights,  or (3) with  respect to consents  referred in clause
          (ii),  such consent need not be obtained  prior to an  assignment,  or
          failure to obtain such  consent  would not  reasonably  be expected to
          have a material adverse impact on the relevant property;

               1.1.6  Encumbrances for Taxes or other  assessments or changes by
          Governmental  Authorities  that arise by  operation of Law and are not
          yet due and  payable,  or that  are  being  contested  in good  faith;
          provided that all monies that are required to be paid under applicable
          Law during the pendency of any contest have been paid;

               1.1.7    mechanics',    carriers',    workers',    materialmen's,
          warehousemen's  and similar  liens arising or incurred in the ordinary
          course of business for (a) sums not due and  payable,  or (b) payments
          that are being  contested  in good faith by  appropriate  proceedings,
          which  proceedings are disclosed in Section 1.1.7 of THX's  Disclosure
          Schedule;

               1.1.8 all rights to consent  by,  required  notices  to,  filings
          with, or other actions by third parties or Governmental Authorities in
          connection  with  the  sale or  conveyance  of oil and gas  leases  or
          interests therein if the same are customarily  obtained  subsequent to
          such sale or conveyance;

               1.1.9 easements,  rights-of-way,  servitudes,  surface leases and
          other  rights in respect of surface  operations,  pipelines,  grazing,
          logging,  canals,  ditches,  reservoirs  or the like  and  conditions,
          covenants or other  restrictions  relating  thereto,  duly recorded or
          visible on the  ground;  permits  disclosed  in  Schedule  1.1.9;  and
          easements of streets,  alleys, highways,  pipelines,  telephone lines,
          power lines,  railways and other easements and  rights-of-way on, over
          or in  respect  of any  Real  Property  which  do not  and  would  not
          reasonably  be expected to impair the  continued  use or  operation of
          such  assets  substantially  as  such  assets  are  currently  used or
          operated;

                                       6


               1.1.10 rights reserved to or vested in any Governmental Authority
          to control or regulate  any  property  used in the  Business,  and all
          applicable Laws which,  in either case, will not materially  interfere
          with the operation of the Business;

               1.1.11  any  matter  that  a  reasonable  and  prudent   operator
          knowledgeable  in the  gas and  oil  business  would  not  consider  a
          material impairment of Seneca Upshur's title; and

               1.1.12 any  Encumbrances and similar matters set forth in Section
          1.1.12 of THX's Disclosure Schedule.

     "Person" means an individual,  partnership,  corporation, limited liability
company, joint stock company,  unincorporated organization or association, trust
or joint venture, or a Governmental Authority.

     "RCRA" means the Resource Conservation and Recovery Act, as amended.

     "Real  Property" means any real property owned by  Seneca-Upshur  as of the
Closing Date.

     "Registration Rights Agreement" means the Amended and Restated Registration
Rights Agreement to be entered into by and among THX, THEC and KeySpan as of the
Closing, in the form attached hereto as Exhibit B.

     "Regulated  Substances"  means  any  pollutant,   contaminant,   hazardous,
dangerous or toxic  substance,  material or waste defined as such in,  regulated
pursuant to, or that could give rise to liability under, any  Environmental  Law
including  any  explosives,   radon,   radioactive  materials,   asbestos,  urea
formaldehyde foam insulation,  polychlorinated  biphenyls,  petroleum (including
crude oil and any fraction  thereof) and  petroleum  products  (including  waste
petroleum and petroleum products).

     "Release" means any release, spill, emission,  discharge, leaking, pumping,
injection,  deposit, disposal,  dispersal, leaching or migration into the indoor
or outdoor  environment  (including ambient air, surface water,  groundwater and
surface or  subsurface  strata) or into or out of any  property,  including  the
movement of Regulated  Substances  through or in the air,  soil,  surface water,
groundwater or property.

     "Retained  Business" means the business currently  conducted by THX and its
subsidiaries other than the Business.

     "Securities  Act"  means  the  United  States  Securities  Act of 1933,  as
amended.

     "Seneca-Upshur Assets" means all of the assets of Seneca-Upshur immediately
prior to giving  effect to the  Contribution  (which  assets have been valued at
$60,000,000 by the parties),  including all of Seneca Upshur's right,  title and
interest in and to the following:

               1.1.13 the oil and gas leases and oil, gas and mineral leases set
          forth in Section 1.1.13 of THX's  Disclosure  Schedule,  together with


                                       7


          all of  Seneca-Upshur's  other right, title and interest in and to the
          land  covered by such  leases,  including  all  mineral,  royalty  and
          overriding   royalty  interests,   and  all  rights,   privileges  and
          obligations   appurtenant  to  those  interests  (the   "Seneca-Upshur
          Leases");

               1.1.14  all rights and  interests  in any unit or pooled  area in
          which the Seneca-Upshur Leases are included,  to the extent that these
          rights  and  interests   arise  from  and  are  associated   with  the
          Seneca-Upshur  Leases or the  Seneca-Upshur  Fee Mineral Interests (as
          hereinafter   defined),   including   all  rights   derived  from  any
          unitization, pooling, operating, communitization or other agreement or
          from any declaration or order of any governmental authority;

               1.1.15 all oil, gas and condensate wells (whether producing,  not
          producing or  abandoned),  water  source,  water  injection  and other
          injection or disposal wells and systems  located on the  Seneca-Upshur
          Leases,  the  Seneca-Upshur Fee Mineral Interests or lands unitized or
          pooled with the Seneca-Upshur  Leases or the Seneca-Upshur Fee Mineral
          Interests (the "Seneca-Upshur Wells");

               1.1.16 all equipment,  facilities,  pipelines, pipeline laterals,
          gathering systems, platforms, well pads, tank batteries,  compressors,
          meters,  improvements,   fixtures,   inventory,  spare  parts,  tools,
          materials and other personal property on the  Seneca-Upshur  Leases or
          used in developing or operating the Seneca-Upshur Leases or producing,
          treating,   storing,    compressing,    processing   or   transporting
          hydrocarbons on or from the Seneca-Upshur  Leases or the Seneca-Upshur
          Fee Mineral Interests (the "Seneca-Upshur Equipment");

               1.1.17   all   easements,   rights-of-way,   licenses,   permits,
          servitudes, surface leases and similar interests applicable to or used
          in operating the Seneca-Upshur Leases or the Seneca-Upshur Fee Mineral
          Interests or the Seneca-Upshur  Equipment (the "Seneca-Upshur  Surface
          Agreements");

               1.1.18 all  contracts and  contractual  rights,  obligations  and
          interests  relating to the  Seneca-Upshur  Leases or the Seneca-Upshur
          Fee  Mineral  Interests  or the  lands  unitized  or  pooled  with the
          Seneca-Upshur  Leases or the Seneca-Upshur Fee Mineral  Interests,  or
          the  Seneca-Upshur  Equipment,   including  unit  agreements,  farmout
          agreements, farm-in agreements,  operating agreements, and hydrocarbon
          sales,  purchase,  gathering,  transportation,   treating,  marketing,
          exchange,  processing and fractionating agreements,  whether of record
          or not (the "Seneca-Upshur Contracts");

               1.1.19 all fee mineral  interests  described in Section 1.1.19 of
          THX's Disclosure Schedule (the "Seneca-Upshur Fee Mineral Interests"),
          including all rights and obligations  pertaining to the  Seneca-Upshur
          Fee Mineral Interests under any of the Seneca-Upshur Contracts;

               1.1.20  all other  tangibles,  miscellaneous  interests  or other
          assets  on or  used  in  connection  with  the  Seneca-Upshur  Leases,
          Seneca-Upshur    Wells,    Seneca-Upshur   Fee   Mineral    Interests,
          Seneca-Upshur Equipment and/or Seneca-Upshur Contracts,  including all
          lease files,  land files,  well files,  production  records,  division


                                       8


          order files, abstracts, title opinions, and contract files, insofar as
          they are directly  related to the items  described in Sections  1.1.13
          through 1.1.20 hereof; and

               1.1.21  Hydrocarbons  that have  been  produced  from the  assets
          described  in  Sections  1.1.13  through  1.1.20  above  prior  to the
          Effective  Time and that are stored,  at the  Effective  Time,  in the
          Seneca-Upshur  Leases  or unit  stock  tanks  or in the  Seneca-Upshur
          Leases or unit gathering  lines or production  facilities  upstream of
          the sale or custody  transfer  meters of the purchaser or processor of
          such  Hydrocarbon   production  from  the  Seneca-Upshur  Assets,  the
          quantities  of  which  have  been  determined  at the  Effective  Time
          pursuant to the  Seneca-Upshur  Leases or unit  operator's  tank gauge
          readings, meter tickets or other inventory records;  provided that for
          natural gas wells that do not have  electronic  measurement  and where
          charts are changed on other than a daily basis,  the  production  from
          such wells shall be pro-rated as of the Effective  Time based upon the
          number of days between chart changes  during the period  between chart
          changes that  includes the Closing  Time,  the number of days the well
          was actually  produced  during the period  between  chart changes that
          includes the Closing Time, and the  assumption  that the well produced
          equal quantities  during each day of actual  production  ("Hydrocarbon
          Inventory").

     "subsidiaries"  of any  entity  means,  at any  date,  any  Person  (a) the
accounts of which would be consolidated  with those of the applicable  entity in
such entity's  consolidated  financial  statements if such financial  statements
were  prepared  in  accordance  with  GAAP  as of  such  date,  or (b) of  which
securities or other ownership interests representing more than 50% of the equity
or more than 50% of the ordinary  voting power or, in the case of a partnership,
more  than 50% of the  general  partnership  interests  or more  than 50% of the
profits or losses of which are, as of such date,  owned,  controlled  or held by
the applicable entity or one or more subsidiaries of such entity.

     "Tax"  means any United  States  federal,  state,  local or foreign  taxes,
including but not limited to any income,  gross receipts,  payroll,  employment,
excise,  severance,  stamp, business,  premium, windfall profits, capital stock,
franchise,  profits,  withholding,  social security (or similar),  unemployment,
disability,   real  property,   personal   property,   sales,   use,   transfer,
registration, value added tax, or similar tax, any alternative or add-on minimum
tax, and any estimated tax, in each case,  including any interest,  penalty,  or
addition thereto, whether disputed or not.

     "Tax Matters  Agreement" means the Tax Matters Agreement to be entered into
by and among THX, THEC, KeySpan and Seneca-Upshur as of the Closing, in the form
attached hereto as Exhibit C.

     "THEC THX  Shares"  means  10,800,000  shares of THX Common  Stock owned by
THEC.

     "THEC's  Disclosure  Schedule" means the disclosure  schedule that THEC has
delivered to THX on the date of this Agreement prior to the execution hereof.

     "THX's  Disclosure  Schedule"  means the  disclosure  schedule that THX has
delivered to THEC on the date of this Agreement prior to the execution hereof.

                                       9



     "Transition  Services  Agreement" means the Transition  Services  Agreement
pursuant to which THX agrees to provide  certain  transitional  operational  and
accounting  services  with  respect to the  Business,  to be entered into by and
between THX and  Seneca-Upshur  as of the Closing in the form attached hereto as
Exhibit D and executed concurrently herewith.

     "Underwriting  Agreement" means the Underwriting  Agreement entered into by
and among THX and KeySpan and Lehman  Brothers  Inc.  and  Goldman,  Sachs & Co.
dated May 26, 2004 in  connection  with the  issuance  and sale of shares of THX
Common Stock.

     Section  1.2 Terms  Defined  in Other  Sections.  The  following  terms are
defined elsewhere in this Agreement in the following Sections:

         Agreement...........................................    Preamble

         Benefit Plans.......................................    Section 4.16.1

         Benefits Package....................................    Section 6.1.2

         Board...............................................    Section 6.8

         Business............................................    Recitals

         Business Assets.....................................    Section 3.2.1

         Business Contribution...............................    Section 3.1

         Business Employees..................................    Section 6.1.1

         Business Liabilities................................    Section 3.2.3

         Business Records....................................    Section 6.4.2

         Claim Dispute Notice................................    Section 10.5.4

         Closing.............................................    Section 2.2

         Closing Date........................................    Section 2.2

         Commitment..........................................    Section 4.21

         Confidential Information............................    Section 6.4.1

         Contributed Business Assets.........................    Section 3.2.1

         Contributed Business Liabilities....................    Section 3.2.3

         Contribution........................................    Section 3.1

         Damages.............................................    Section 10.4

         Distribution........................................    Section 2.1

         Employees...........................................    Section 6.1

         Excluded Assets.....................................    Section 3.2.2


                                       10


         Indemnity Claim.....................................    Section 10.5.1

         KeySpan.............................................    Preamble

         KeySpan Basket......................................    Section 10.3.2

         KeySpan Cap.........................................    Section 10.3.2

         KeySpan De Minimis..................................    Section 10.3.2


         KeySpan's knowledge.................................    Section 11.13

         Licenses............................................    Section 4.9

         MMMF................................................    Section 4.26.1

         NORM................................................    Section 4.26.1

         Notice of Claim.....................................    Section 10.5.1

         PBGC................................................    Section 4.16.3

         Purchaser's Title Representations and Warranties....    Section 10.1

         Records.............................................    Section 6.4.2

         Representatives.....................................    Section 10.2.1

         Reserve Report......................................    Section 4.18.1

         Retained Liabilities................................    Section 3.2.4

         Seller's Title Representations and Warranties.......    Section 10.1

         Seneca-Upshur.......................................    Preamble

         Seneca-Upshur Common Stock.........................    Section 4.2.1

         Seneca-Upshur Contracts............................    Section 1.1.18

         Seneca-Upshur Employees............................    Section 4.16.1

         Seneca-Upshur Equipment............................    Section 1.1.16

         Seneca-Upshur Fee Mineral Interests                    Section 1.1.19

         Seneca-Upshur Leases...............................    Section 1.1.13

         Seneca-Upshur Shares...............................    Section 4.2.1

         Seneca-Upshur Surface Agreements...................    Section 1.1.17

         Seneca-Upshur Wells................................    Section 1.1.15

         THEC...............................................    Preamble

         THEC's knowledge...................................    Section 11.13

         Third Party Claim..................................    Section 10.6.1

         THX................................................    Preamble

         THX Basket.........................................    Section 10.2.2


                                       11


         THX Cap............................................    Section 10.2.2

         THX Common Stock...................................    Section 4.2.1

         THX De Minimis.....................................    Section 4.2.1

         THX Shares.........................................    Section 4.2.1

         THX's knowledge....................................    Section 11.13

         Transferred Employees..............................    Section 6.1.2

     Section 1.3  Interpretation  and Rules of  Construction.  Unless  otherwise
indicated to the contrary in this  Agreement by the context or use thereof:  (a)
the words, "herein," "hereto," "hereof," "hereunder" and words of similar import
refer  to  this  Agreement  as a  whole  and not to any  particular  Section  or
paragraph of this Agreement; (b) words importing the masculine gender shall also
include the feminine and neutral  genders,  and vice versa;  (c) words importing
the singular  shall also include the plural,  and vice versa;  and (d) the words
"include,"  "includes,"  or  "including"  are deemed to be followed by the words
"without  limitation."  All terms  defined in this  Agreement  have the  defined
meanings  when  used in any  certificate  or other  document  made or  delivered
pursuant hereto, unless otherwise defined therein.

                                  Article II.
                         DISTRIBUTION OF STOCK; CLOSING

     Section  2.1  Distribution  of Stock.  Upon the terms  and  subject  to the
conditions of this Agreement,  at the Closing,  (a) THX shall assign,  transfer,
convey and deliver to THEC,  and THEC shall  accept and acquire from THX, all of
the  Seneca-Upshur  Shares (free and clear of all  Encumbrances) in exchange for
the THEC THX Shares, and (b) THEC shall assign, transfer,  convey and deliver to
THX, and THX shall  accept and acquire from THEC,  the THEC THX Shares (free and
clear  of  all   Encumbrances)   in  exchange  for  the   Seneca-Upshur   Shares
(collectively, the "Distribution").

     Section  2.2  Closing.  The  closing  of the  Distribution  and  the  other
transactions contemplated hereby (the "Closing") shall take place at the offices
of King & Spalding LLP, Suite 4000, 1100 Louisiana Street,  Houston, Texas 77002
at 10:00 a.m.  on June 2,  2004,  or on such other date or at such other time as
the parties  hereto may agree.  The date of the Closing is referred to herein as
the "Closing Date."

     Section 2.3 THX's  Deliveries  at the Closing.  At the  Closing,  THX shall
deliver or cause to be delivered to THEC the following:

               2.3.1 one or more stock certificates,  together with stock powers
          executed  in blank,  representing  all of the issued  and  outstanding
          capital stock of Seneca-Upshur;

               2.3.2  the  stock  books,  stock  ledgers  and  minute  books  of
          Seneca-Upshur;

               2.3.3  each  of  the   Ancillary   Agreements  to  which  THX  or
          Seneca-Upshur  is a party,  executed by THX or  Seneca-Upshur,  as the
          case may be;

                                       12


                    2.3.4 letters of resignation,  dated as of the Closing Date,
               from each  director  and officer of  Seneca-Upshur  that is not a
               Business Employee; and

                    2.3.5 such other  documents  as are  reasonably  required by
               THEC to be delivered to effectuate the transactions  contemplated
               hereby.

     Section 2.4 THEC's  Deliveries at the Closing.  At the Closing,  THEC shall
deliver or cause to be delivered to THX the following:

                    2.4.1 one or more stock  certificates,  together  with stock
               powers executed in blank, representing the THEC THX Shares;

                    2.4.2  each of the  Ancillary  Agreements  to which  THEC or
               KeySpan is a party,  executed by THEC or KeySpan, as the case may
               be;

                    2.4.3 letters of resignation,  dated as of the Closing Date,
               from each of Messrs.  Fani,  Luterman  and Nichols as a member of
               the THX Board of Directors; and

                    2.4.4 such other documents as are reasonably required by THX
               to be  delivered  to  effectuate  the  transactions  contemplated
               hereby.

Each  document of transfer or  assumption  referred to in this Article II (or in
any  related  definition  set forth in  Article  I) that is not  attached  as an
Exhibit to this Agreement or is not otherwise an Ancillary Agreement shall be in
customary form and shall be reasonably satisfactory in form and substance to the
parties thereto.

                                  Article III.
                                 REORGANIZATION

     Section 3.1 Contribution.  On or prior to the date hereof,  THX has, or has
caused its respective  subsidiaries  to,  contribute to  Seneca-Upshur  the Cash
Amount  and to  assign,  transfer,  convey and  deliver  to  Seneca-Upshur,  the
Contributed  Business Assets and the Contributed  Business  Liabilities,  and in
exchange  therefore,  Seneca-Upshur  has  accepted,  assumed  and agreed to pay,
perform or otherwise  discharge,  in accordance  with the  respective  terms and
subject  to  the  respective   conditions  thereof,   the  Contributed  Business
Liabilities  in  accordance   with  the  Asset   Contribution   Agreement  (such
contributions  and  assumptions  are  referred  to  herein  collectively  as the
"Contribution"  and such  contributions  (excluding the contribution of the Cash
Amount) and  assumptions  are referred to herein  collectively  as the "Business
Contribution").  Each of the representations,  warranties, covenants, agreements
and  undertakings  of THX  contained  herein is given or made as if,  and on the
basis that, the Business  Contribution  had occurred prior to all dates relevant
to such representations,  warranties, covenants and undertakings. Subject to the
foregoing,  any  references  to  "Seneca-Upshur"  in any  such  representations,
warranties,  covenants,  agreements  and  undertakings  will be  deemed  to be a
reference to Seneca-Upshur  Petroleum,  Inc. after giving effect to the Business
Contribution,  but for the avoidance of doubt not the  contribution  of the Cash
Amount, unless the context clearly indicates otherwise.

Section 3.2       Assets and Liabilities.

                                       13


                    3.2.1  Business  Assets.  For  purposes  of this  Agreement,
               "Business  Assets" means all of the  Contributed  Business Assets
               and all of the Seneca-Upshur Assets.

                    3.2.2  Excluded  Assets.  All  assets,  rights,  properties,
               agreements or other  interests  owned by THX or its  subsidiaries
               (other than Seneca-Upshur) that are not used solely in connection
               with the Business, including the assets, rights and interests set
               forth in Section 1.3 of the Asset Contribution Agreement, or that
               are  described,   or  referred  to  in  Section  3.2.2  of  THX's
               Disclosure Schedule (such assets, rights, properties,  agreements
               and other  interests being referred to herein,  collectively,  as
               the "Excluded  Assets"),  shall be excluded from the transactions
               contemplated  hereby and shall remain the property of THX and its
               subsidiaries.

                    3.2.3  Business  Liabilities.   Subject  to  the  terms  and
               conditions of this  Agreement,  in partial  consideration  of the
               transfer to  Seneca-Upshur  of the Contributed  Business  Assets,
               Seneca-Upshur  has assumed the Contributed  Business  Liabilities
               and, on the Closing  Date will assume the  following  liabilities
               and  obligations  of the Business  (collectively,  the  "Business
               Liabilities"):

                         3.2.3.1   Liabilities   relating  to  the   Transferred
                    Employees  arising  following the Closing Date to the extent
                    expressly  allocated to Seneca-Upshur or KeySpan pursuant to
                    Section 6.1; and

                         3.2.3.2 all  Liabilities  related to the  ownership  or
                    operation of the Business that are not Retained Liabilities,
                    whether arising before or after the Effective Time.

                    3.2.4 Retained  Liabilities.  THX hereby retains, and is and
               will remain liable for the payment,  performance and discharge of
               the following (collectively, the "Retained Liabilities"):

                         3.2.4.1 all Liabilities relating to the Excluded Assets
                    whether arising before or after the Effective Time;

                         3.2.4.2 any Indebtedness of  Seneca-Upshur  outstanding
                    as of the Closing Date;

                         3.2.4.3  all  Liabilities  relating  to (a) current and
                    former   employees,   directors  and   consultants   of  THX
                    (including  the  Business  Employees)  and (b) all  employee
                    benefit plans, programs,  policies and arrangements (whether
                    or not Benefit Plans) of THX and its  Affiliates  (including
                    Seneca-Upshur),  in each case to the extent arising  before,
                    on or after the Closing Date,  except to the extent any such
                    Liabilities  are  expressly  allocated to  Seneca-Upshur  or
                    KeySpan pursuant to Section 6.1;

                         3.2.4.4 all regular lease operating  expenses  relating
                    to the  Seneca-Upshur  Leases  outstanding  at the Effective
                    Time or  arising  after  the  Effective  Time to the  extent
                    accrued prior to the Effective Time.

                                       14


                         3.2.4.5   all   accounts    payable    (including   any
                    intercompany  payables) of Seneca-Upshur  outstanding at the
                    Effective  Time  or  arising  after  the  Effective  Time in
                    respect  of goods or  services  provided  on or prior to the
                    Effective Time; and

                         3.2.4.6 all liabilities or obligations  with respect to
                    any production or pipeline imbalances and penalties assessed
                    as a result of such  imbalances,  associated with production
                    and sales prior to the Effective Time.

                    3.2.5 Taxes. For purposes of this Agreement, Taxes shall not
               be a Business Liability or a Retained  Liability,  and refunds or
               credits  from  Taxes  shall not be a Business  Asset or  Excluded
               Asset.  Liabilities,  refunds and credits  with  respect to Taxes
               shall be governed by and allocated exclusively in accordance with
               the Tax Matters Agreement.

                    3.2.6  Post-Closing  Reimbursements.  Following the Closing,
               THX will (i) pay to Seneca-Upshur any proceeds received by THX on
               account of  Hydrocarbon  Inventory  as of the  Effective  Time or
               Hydrocarbons  produced  on or after the  Effective  Time and (ii)
               reimburse  Seneca-Upshur  for any expenses paid by  Seneca-Upshur
               that   represent   Retained   Liabilities,   upon   receipt  from
               Seneca-Upshur of appropriate evidence of such payment.  Following
               the  Closing,  Seneca-Upshur  will  promptly  (i)  pay to THX any
               proceeds  received by  Seneca-Upshur  on account of  Hydrocarbons
               produced  prior to the  Effective  Time  other  than  Hydrocarbon
               Inventory as of the Effective Time and (ii) reimburse THX for any
               expenses paid by THX that represent  Business  Liabilities,  upon
               receipt from THX of  appropriate  evidence of such  payment.  The
               parties  agree to keep proper  accounts of such amounts and agree
               to settle such  amounts on a date that is to be  mutually  agreed
               within 60 days after Closing and on each following  successive 30
               day period. Any credit or liability with respect to production or
               pipeline  imbalances and any associated  penalties existing as of
               the  Effective  Time will be  settled  by the  parties  after the
               Closing.

     Section  3.3  Assignment  of  Contracts  and  Rights.  With  respect to any
Contributed Business Contract and any claim, right or benefit arising thereunder
or resulting therefrom to be assumed by Seneca-Upshur  hereunder,  where written
consent  of the other  parties  to any such  Contributed  Business  Contract  is
required from other parties for the assignment thereof to Seneca-Upshur and such
consent is not obtained by THX on or before the Closing Date, THX and THEC shall
cooperate in an arrangement reasonably  satisfactory to THX and THEC under which
Seneca-Upshur  would obtain, to the extent practicable,  the claims,  rights and
benefits and assume the corresponding  obligations thereunder in accordance with
this   Agreement   and  the   Asset   Contribution   Agreement,   including   by
subcontracting,  sublicensing  or subleasing such claims,  rights,  benefits and
obligations to Seneca-Upshur  and/or by entering into an arrangement under which
THX would  enforce,  for the  benefit of THEC and at the  expense of THEC,  such
claims,  rights and benefits,  and Seneca-Upshur would assume for the benefit of
THX such obligations, against a third party thereto. From and after the Closing,
THX will  promptly  pay to THEC when  received  all  monies  received  by THX in
connection  with any  Business  Asset or any  claim,  right or  benefit  arising
thereunder  relating  to the  period  on or  after  the  Effective  Time and not


                                       15


previously  transferred  to  Seneca-Upshur.  As of or from the Closing Date, THX
authorizes Seneca-Upshur,  to the extent permitted by applicable Law, to perform
all of the  obligations and receive all of the benefits as of the Effective Time
of  THX  under  such   Contributed   Business   Contracts   and  appoints   THEC
attorney-in-fact to act in its name on its behalf with respect thereto.

                                  Article IV.
                      REPRESENTATIONS AND WARRANTIES OF THX

         THX hereby represents and warrants to THEC and KeySpan as follows:

     Section 4.1 Organization and  Qualification.  Each of THX and Seneca-Upshur
is a corporation duly organized, validly existing and in good standing under the
laws of the state of its incorporation and has the requisite  corporate power to
own,  lease and operate its properties and to carry on its business as it is now
being  conducted.  Each of THX and  Seneca-Upshur  is duly  qualified to conduct
business and in good standing as a foreign  corporation in every jurisdiction in
which its  ownership  or lease of property or the  conduct of its  business  and
operations makes such qualification necessary,  except for such jurisdictions in
which THX's or  Seneca-Upshur's  failure to be so qualified would not reasonably
be expected to have a Material Adverse Effect.  Neither THX nor Seneca-Upshur is
in violation  in any material  respect of any  provision of its  certificate  of
incorporation, by-laws or other comparable organizational documents.

        Section 4.2  Capitalization.

               4.2.1 The authorized  capital stock of THX consists of 50,000,000
          shares of common  stock,  par value  $.01 per share  (the "THX  Common
          Stock"), of which 31,888,945 shares of Common Stock (the "THX Shares")
          are  issued  and  outstanding  as of the date  hereof.  The THX Shares
          constitute all of the issued and  outstanding  shares of capital stock
          of THX. Except as disclosed in THX's  Prospectus  Supplement dated May
          26, 2004,  there are not any outstanding or authorized  subscriptions,
          options,   warrants,   calls,  rights,   commitments   (contingent  or
          otherwise) or other  agreements of any character (any of the foregoing
          a "Commitment")  obligating THX to issue any additional  shares of its
          capital stock, or any other securities  convertible into or evidencing
          the right to subscribe for any shares of THX Common Stock.

               4.2.2 The authorized  capital stock of Seneca-Upshur  consists of
          100   shares  of  common   stock,   par  value  $50  per  share   (the
          "Seneca-Upshur  Common  Stock"),  of which 100  shares  are issued and
          outstanding (the "Seneca-Upshur Shares"). The Seneca-Upshur Shares are
          owned by THX, free and clear of any  Encumbrances,  and have been duly
          authorized and validly issued and are fully paid and nonassessable and
          free of preemptive  rights. At the Closing,  the Seneca-Upshur  Shares
          will be transferred to THEC free and clear of any Encumbrances  except
          as may be set forth in  Section  4.2.2 of THX's  Disclosure  Schedule.
          There are not any Commitments  obligating  Seneca-Upshur  to issue any
          additional  shares  of its  capital  stock,  or any  other  securities
          convertible  into or evidencing  the right to subscribe for any shares
          of Seneca-Upshur  Common Stock. THX is not a party to any voting trust
          or  agreement  with  respect  to any  Seneca-Upshur  Shares  or to any
          agreement  relating  to  the  issuance,  sale,  redemption,  transfer,
          acquisition   or   other   disposition   of   Seneca-Upshur    Shares.


                                       16


          Seneca-Upshur  does not own any capital  stock,  membership  interest,
          partnership interest,  joint venture interest or other equity interest
          in any Person.

     Section 4.3 Authorization.  Each of THX and Seneca-Upshur has the requisite
corporate  power and  authority to execute and deliver this  Agreement,  the Tax
Matters  Agreement and the other  Ancillary  Agreements  and to  consummate  the
transactions  contemplated  hereby and thereby and the execution and delivery by
THX and Seneca-Upshur of this Agreement, the Tax Matters Agreement and the other
Ancillary  Agreements  and  the  consummation  by THX and  Seneca-Upshur  of the
transactions  contemplated  hereby  and  thereby  have  been  duly  and  validly
authorized  by the board of directors of each of THX and  Seneca-Upshur,  and no
other corporate proceedings on the part of THX or Seneca-Upshur are necessary to
authorize  this  Agreement,  the Tax Matters  Agreement  or the other  Ancillary
Agreements or to consummate  the  transactions  contemplated  hereby or thereby.
Each of this  Agreement,  the Tax  Matters  Agreement  and the  other  Ancillary
Agreements  has been duly and validly  executed and delivered by each of THX and
Seneca-Upshur,  and constitutes the legal,  valid and binding obligation of each
of THX and Seneca-Upshur,  enforceable  against each of THX and Seneca-Upshur in
accordance  with its terms,  subject to (a) applicable  bankruptcy,  insolvency,
reorganization,  moratorium,  and other similar laws of general application with
respect to creditors,  (b) general  principles of equity, and (c) the power of a
court to deny enforcement of remedies generally based upon public policy.

     Section 4.4 Consents and Approvals; No Violation. Neither the execution and
delivery of this  Agreement,  the Tax Matters  Agreement and the other Ancillary
Agreements by THX and Seneca-Upshur,  as applicable, nor the consummation by THX
and Seneca-Upshur of the transactions  contemplated hereby or thereby,  will (a)
violate,  conflict  with or result in a breach of any provision of the governing
documents of THX or  Seneca-Upshur,  (b) require any consent,  approval,  order,
authorization,  waiver or License  of, or filing  with or  notification  to, any
third party or Governmental Authority, except (i) as set forth in Section 4.4 of
THX's Disclosure Schedule,  or (ii) any consents,  approvals,  authorizations or
waivers  normally  obtained after the consummation of transactions of the nature
contemplated by this Agreement and the failure to obtain such consent, approval,
authorization or waiver or License would not,  individually or in the aggregate,
have a Material Adverse Effect,  (c) (with or without notice or lapse of time or
both) conflict with,  violate,  require  consent under,  result in a default (or
give rise to any right of  termination,  cancellation  or  acceleration)  of any
Contract or License  other than as to which  requisite  waivers or consents have
been obtained or which,  individually  or in the  aggregate,  are not reasonably
expected to have a Material  Adverse  Effect,  or (d)  violate any order,  writ,
injunction,   decree,   statute,  rule,  or  regulation  applicable  to  THX  or
Seneca-Upshur or any of its assets, except for violations which, individually or
in the aggregate,  would not  reasonably be expected to have a Material  Adverse
Effect.

     Section 4.5 Lease Operating Statements.  Seneca-Upshur is not party to, nor
are any of its properties or assets bound by, any oil and gas leases or oil, gas
and mineral leases other than the Business Leases.  THX previously has delivered
to THEC and KeySpan true and correct  copies of lease  operating  statements and
authorizations for expenditure for all Business Leases.

     Section 4.6 Financial Information; No Undisclosed Liabilities.

                                       17


                    4.6.1 The summary of lease operating  statements  previously
               provided to KeySpan was true and correct in all material respects
               as of the date of the information set forth therein.

                    4.6.2 As of the  Closing  Date,  Seneca-Upshur  will have no
               Indebtedness.  Except  as set  forth  in  Section  4.6  of  THX's
               Disclosure Schedule, as of the Closing Date, Seneca-Upshur has no
               material liabilities or obligations of any kind, whether accrued,
               contingent, absolute, determined, determinable or otherwise, that
               would be required to be reflected on a balance sheet or the notes
               thereto  prepared in  accordance  with GAAP,  other than  routine
               operating  expenses  incurred  at or after  the  Effective  Time,
               liability  for Taxes  (which  are  addressed  in the Tax  Matters
               Agreement),  royalty and other  payment  obligations  relating to
               Hydrocarbons  produced at or after the  Effective  Time and usual
               and  customary  asset  retirement  and  abandonment   obligations
               relating to any wells on any properties set forth in Section 4.15
               of THX's Disclosure Schedule.

     Section  4.7 Bank  Account  Information.  Section  4.7 of THX's  Disclosure
Schedule  contains an accurate list of the names and addresses of every bank and
other financial institution in which Seneca-Upshur maintains an account (whether
checking,  savings or otherwise),  lock box or safe deposit box, and the account
numbers and persons having signature authority or legal access thereto.

     Section  4.8  Litigation.  Except  as set  forth  in  Section  4.8 of THX's
Disclosure  Schedule,  there are no  Actions  pending  or,  to THX's  knowledge,
threatened  against  Seneca-Upshur  or with respect to assets or  properties  of
Seneca-Upshur.  Except as set forth in Section 4.8 of THX's Disclosure  Schedule
(a)  there  are  no  judgments  or  outstanding  orders,  injunctions,  decrees,
stipulations, or awards (whether rendered by a court or administrative agency or
by  arbitration)  against THX that would  reasonably  be  expected to  prohibit,
restrict  or affect the  Business in any  material  respect and (b) there are no
judgments or outstanding orders,  injunctions,  decrees,  stipulations or awards
(whether rendered by a court or administrative agency or by arbitration) against
Seneca-Upshur.

     Section  4.9  Licenses;  Approvals.  Except as set forth in Section  4.9 of
THX's Disclosure Schedule,  Seneca-Upshur  possesses all governmental  licenses,
permits, franchises, and other authorizations of any Governmental Authority (the
"Licenses")  that are necessary to the ownership or operation of the Business as
currently  conducted  and all such  Licenses are and  immediately  following the
Closing  will  remain in full  force and  effect,  except  where the  failure to
possess  any  License or the  failure to be in full force and effect  would not,
individually  or in the  aggregate,  reasonably  be  expected to have a Material
Adverse  Effect.  No  proceeding is pending or, to THX's  knowledge,  threatened
seeking the revocation or limitation of any such License.

     Section 4.10 Labor Matters. Seneca-Upshur has no agreements or arrangements
with,  commitments to or  responsibility  for any employees or consultants other
than the Business  Employees.  There are no agreements  with any labor unions or
associations  representing  Business  Employees.  No material  work  stoppage is
pending or, to THX's knowledge, threatened. Except as set forth in Section 4.110
of THX's Disclosure  Schedule,  neither THX nor Seneca-Upshur is involved in or,
to THX's knowledge, is threatened with any labor dispute, arbitration,  lawsuit,


                                       18


or  administrative  proceeding  relating  to labor  matters  involving  Business
Employees.

     Section 4.11 Compliance  with Laws.  Except as set forth in Section 4.11 of
THX's Disclosure Schedule,  THX and Seneca-Upshur have conducted the Business in
compliance with all statutes, laws, regulations,  ordinances,  rules, judgments,
orders, or decrees  applicable  thereto (provided that no representation is made
in this Section 4.11 as to compliance with Environmental  Laws,  representations
as to which are set forth exclusively in Section 4.14), except for violations or
failures so to comply,  if any,  that would not,  individually  or in the in the
aggregate, reasonably be expected to have a Material Adverse Effect.

     Section 4.12  Insurance.  Section 4.12 of THX's  Disclosure  Schedule  sets
forth a list of all Insurance  Policies issued in favor of THX or  Seneca-Upshur
that relate to the Business.  All such Insurance  Policies are in full force and
effect  and are  valid and  enforceable  and cover  against  the risks  normally
insured against by entities in the same or similar lines of business in coverage
amounts  typically and  reasonably  carried by such  entities.  THX has paid all
premiums,  deductibles  and  retro-adjustment  billings,  if any,  with  respect
thereto  covering  all periods and  ensuring  coverage of the Business up to and
including the date hereof. In the last two years,  neither THX nor Seneca-Upshur
has received notice of  cancellation  or termination of such Insurance  Policies
other than in connection with normal renewals of such Insurance Policies.

     Section 4.13 Contracts.  Except for the Business Contracts and the Business
Surface  Agreements,  there are no Contracts that are material to the ownership,
operation,  value  or  use  of  the  Business,  or  to  which  the  Business  or
Seneca-Upshur  will be  subject  upon the  Closing.  THX has made  available  to
KeySpan true and complete copies of all Business Leases,  Business Contracts and
Business Surface  Agreements.  THX and  Seneca-Upshur  have complied with all of
their material  obligations  under all Business  Contracts and Business  Surface
Agreements to which they are party and no defaults  have been  asserted  against
them and to the  knowledge  of THX, no other party to any  Business  Contract or
Business Surface Agreement is in default thereunder in any material respect. All
Business  Contracts and Business  Surface  Agreements are valid,  binding and in
full force and effect.  The Business  Contracts and Business Surface  Agreements
contain  only  terms  that  (a) are  customary  in the oil and gas  exploration,
development  or  extraction  business in the area in which the  Business  Assets
affected by such leases or  contracts  are  located,  (b) are of the type that a
prudent operator in such area would not find  objectionable or imprudent and (c)
individually   or  in  the   aggregate   do  not   materially   interfere   with
Seneca-Upshur's  rights to own,  operate and maintain the Business Assets in the
manner and for the purposes in and for which they are currently operated.

     Section 4.14 Environmental Matters.  Except as set forth in Section 4.14 of
THX's Disclosure Schedule, and subject to Section 4.26.2 of this Agreement,  (a)
each of THX,  Seneca-Upshur  and the Business  complies in all material respects
with all  applicable  Environmental  Laws and has not  violated in any  material
respect any such  Environmental  Laws, (b) without  limitation of the foregoing,
there are no  existing,  pending  or, to THX's  knowledge,  threatened  actions,
suits, investigations, inquiries, proceedings (including those involving cleanup
obligations) by any Person relating to any (i) violation or alleged violation of
any Environmental Laws, or (ii) actual or potential Liability as a result of the
presence,  Release or  threatened  Release of any  Regulated  Substances  at any
property (including the Real Properties),  in each case that could reasonably be


                                       19


expected to materially and adversely affect THX,  Seneca-Upshur or the Business,
(c) there are and have been no Regulated  Substances or other  conditions at any
property owned, leased,  operated,  or otherwise used now or in the past by THX,
Seneca-Upshur or the Business,  or at any other location,  in circumstances that
could   reasonably  be  expected  to  materially   and  adversely   affect  THX,
Seneca-Upshur or the Business under any applicable  Environmental  Law or result
in  material  costs to THX,  Seneca-Upshur  or the  Business  arising out of any
applicable  Environmental Laws, (d) all material  Environmental Permits required
to be obtained or filed by THX, Seneca-Upshur or the Business in connection with
the  operation of the  Business or the assets and  properties  of  Seneca-Upshur
(including  such  Environmental  Permits  required for the  treatment,  storage,
disposal or Release of Regulated  Substances)  have been duly  obtained or filed
and complied with in all material respects,  and are valid and in full force and
effect,  (e) neither THX or Seneca-Upshur has entered into during the previous 5
years or, to THX's knowledge  during any other years any consent decree or other
agreement with any Governmental  Authority relating to any Environmental Laws or
Regulated  Substances,  and  neither  THX or  Seneca-Upshur  is  subject  to any
judgment,  decree,  order or similar  requirement  relating to any Environmental
Laws or Regulated  Substances,  in either case that could reasonably be expected
to materially and adversely affect THX,  Seneca-Upshur or the Business,  and (f)
neither THX or Seneca-Upshur  has assumed or retained,  by contract or operation
of law, any Liabilities under any Environmental Laws or concerning any Regulated
Substances,  in either case that could  reasonably be expected to materially and
adversely  affect THX,  Seneca-Upshur  or the Business,  other than  Liabilities
assumed  in  connection  with  the  transactions  contemplated  by the  EnerVest
Agreement and the  acquisition  of  Seneca-Upshur  by THX from KeySpan.  THX and
Seneca-Upshur  have made  available  to KeySpan a copy of all  studies,  audits,
assessments  or  investigations  concerning  compliance  with,  or  liability or
obligations  under,  Environmental  Laws  affecting  THX,  Seneca-Upshur  or the
Business that are in the possession or control of THX or Seneca-Upshur. The term
"disposal" as used in Section 4.14(d) above has the meaning specified in RCRA.

     Section  4.15 Real  Property.  Except as set forth in Section 4.15 of THX's
Disclosure  Schedule,  Seneca-Upshur does not own, lease,  sublease,  license or
occupy any real property.

     Section 4.16 Employee Benefit Plans.

               4.16.1 Section 4.16.1 of THX's  Disclosure  Schedule sets forth a
          list of all "employee  pension  benefit  plans" (as defined in Section
          3(2) of  ERISA),  "employee  welfare  benefit  plans"  (as  defined in
          Section  3(1) of ERISA),  stock  option,  stock  purchase,  incentive,
          deferred    compensation,     vacation,     employment,     severance,
          change-in-control,   stay-on   bonus,   fringe   benefit,   collective
          bargaining,  employee loan and other employee benefit plans, programs,
          agreements, policies and arrangements, whether or not subject to ERISA
          (including  any funding  mechanism  therefor  now in effect),  whether
          formal or informal,  oral or written,  legally  binding or not,  under
          which (i) any  Business  Employee or any  current or former  employee,
          director   or   consultant   of   Seneca-Upshur   (collectively,   the
          "Seneca-Upshur Employees") has any present or future right to benefits
          and which  are  sponsored,  maintained,  or  contributed  to by THX or
          Seneca-Upshur  or  (ii)   Seneca-Upshur  has  any  present  or  future
          liability  (relating to events or  omissions  arising on or before the
          Closing Date) (all the foregoing being herein called "Benefit Plans").
          With  respect to each  Benefit  Plan,  THX has made  available to THEC


                                       20


          true,  complete  and  correct  copies,  to the  extent  applicable  or
          required,  of the most  recent  summary  plan  description  (with  all
          summaries  of material  modifications  provided  after the most recent
          summary plan description was distributed).

               4.16.2 (a) All Benefit  Plans are and have been  established  and
          administered   in  material   compliance  with  their  terms  and  all
          applicable laws, including without limitation, ERISA and the Code, (b)
          each Benefit Plan which is intended to be qualified within the meaning
          of  Section  401(a) of the Code is so  qualified  and has  received  a
          favorable  determination  letter as to its qualification,  and nothing
          has  occurred,  whether  by  action  or  failure  to act,  that  could
          reasonably  be expected to cause the loss of such  qualification,  and
          (c)  no  event  has  occurred  and  no  condition  exists  that  would
          reasonably be expected to subject Seneca-Upshur, either directly or by
          reason of the affiliation  with any member of its  "Controlled  Group"
          (defined as any  organization  which is a member of a controlled group
          of organizations  within the meaning of Sections  414(b),  (c), (m) or
          (o) of the Code),  to any material tax, fine,  lien,  penalty or other
          liability  imposed by ERISA,  the Code or other applicable laws, rules
          and regulations.

               4.16.3 With respect to any Benefit Plan, (a) no actions, suits or
          claims (except claims for benefits  payable in the normal operation of
          the Benefit Plans) are pending or, to THX's knowledge, threatened, (b)
          no facts or  circumstances  exist that reasonably could be expected to
          give  rise  to  any  such  actions,   suits  or  claims,  and  (c)  no
          administrative investigation, audit or other administrative proceeding
          by the Department of Labor, the Pension Benefit  Guaranty  Corporation
          (the  "PBGC"),  the  Internal  Revenue  Service or other  governmental
          agencies are pending,  to THX's  knowledge,  threatened or in progress
          (including,  without limitation,  any routine requests for information
          from the PBGC).

               4.16.4 All  contributions  to, and  payments  from,  the benefits
          required to be made in  accordance  with the  Benefit  Plans have been
          timely made, other than contributions or payments the failure of which
          to make would not  reasonably  be expected to have a Material  Adverse
          Effect.

               4.16.5 No Benefit  Plan is subject to Section  302 or Title IV of
          ERISA or Section 412 of the Code, and none of THX,  Seneca-Upshur,  or
          any member of their Controlled Group has at any time within the last 5
          years  sponsored  or  contributed  to any such  plan,  or could  have,
          directly or indirectly,  any current or future liability  (relating to
          events or omissions  arising on or before the Closing Date) under,  or
          obligation  in respect of, any such plan,  including an  obligation to
          indemnify any Person for liability related to any such plan.

               4.16.6  (a) No  "reportable  event"  (as such term is  defined in
          Section 4043 of the Code) that could  reasonably be expected to result
          in material liability to THX,  Seneca-Upshur,  KeySpan or any of their
          respective  directors,  employees or  Affiliates,  and no  "prohibited
          transaction"  (as such term is defined in Section  4975 of the Code or
          Section 406 or ERISA) has  occurred  with  respect to any Benefit Plan
          that could  reasonably be expected to result in material  liability to
          Seneca-Upshur, KeySpan or any of their respective directors, employees
          or Affiliates  and (b) there has been no breach of any fiduciary  duty


                                       21


          with  respect to any Benefit  Plan,  other than any such breach  that,
          individually or in the aggregate,  could not reasonably be expected to
          result in material liability to Seneca-Upshur, KeySpan or any of their
          respective directors, employees or Affiliates.

               4.16.7 Neither THX nor  Seneca-Upshur has incurred any current or
          projected  liability in respect of  post-employment or post-retirement
          health,   medical  or  life  insurance   benefits  for   Seneca-Upshur
          Employees,  except as  required  to avoid an excise tax under  Section
          4980B of the Code or otherwise  except as may be required  pursuant to
          any other applicable law.

               4.16.8 Except as set forth in Section 4.16.8 of THX's  Disclosure
          Schedule, no Benefit Plan exists that, as a result of the execution of
          this  Agreement,  shareholder  approval  of  this  Agreement,  or  the
          transactions  contemplated  by this  Agreement  (whether  alone  or in
          connection  with  any  subsequent  event(s)),  will  (a)  entitle  any
          Seneca-Upshur  Employee to severance  pay or any increase in severance
          pay  upon  any  termination  of  employment  after  the  date  of this
          Agreement  other  than  severance  described  in  Section  6.1.6,  (b)
          accelerate  the time of payment or vesting or result in any payment or
          funding  (through a grantor  trust or otherwise)  of  compensation  or
          benefits  under,  increase  the amount  payable or result in any other
          material  obligation  pursuant to, any of the Benefit Plans other than
          the  accelerated  vesting by THX as  described in Section  6.1.3,  (c)
          limit or  restrict  the  right of  Seneca-Upshur  to  merge,  amend or
          terminate  any  of  the  Benefit  Plans  sponsored  or  maintained  by
          Seneca-Upshur,   (d)  cause   Seneca-Upshur   to   record   additional
          compensation  expense  on its  income  statement  with  respect to any
          outstanding stock option or other equity-based award, or (e) result in
          payments  under any of the Benefit Plans which would not be deductible
          under Section 280G of the Code.

               Section  4.17   Non-Foreign   Representation.   Neither  THX  nor
          Seneca-Upshur is a foreign corporation,  foreign partnership,  foreign
          trust,  foreign person,  or foreign estate (as those terms are defined
          in the Code).

               Section 4.18 Reserve Report.

                    4.18.1 THX has made available to THEC a copy of that portion
               of the oil and gas reserve  report with  respect to the  Business
               prepared by the  Independent  Engineers  as of December  31, 2003
               (the "Reserve Report").  Except as set forth in Section 4.18.1 of
               THX's Disclosure Schedule, to THX's knowledge, there are no facts
               that would make the  factual  information  provided by THX to the
               Independent  Engineers and on which the Reserve Report was based,
               inaccurate in any material respect at the time provided.

                    4.18.2  OTHER  THAN AS  EXPRESSLY  SET  FORTH  ABOVE IN THIS
               SECTION 4.18, THX MAKES NO REPRESENTATION OR WARRANTY, AND HEREBY
               DISCLAIMS  ANY  REPRESENTATION  OR  WARRANTY,  THAT  THE  RESERVE
               ESTIMATES,  COST AND CASH FLOW  ESTIMATES,  PRICE  ESTIMATES,  OR
               PRODUCTION  OR  FLOW  RATE  ESTIMATES  CONTAINED  IN THE  RESERVE
               REPORT,  OR IN ANY SUPPLEMENT  THERETO OR UPDATE THEREOF,  ARE IN
               ANY WAY  COMPLETE,  ACCURATE  OR NOT  MISLEADING,  THE SAME BEING


                                       22


               PREDICTIONS AS TO FUTURE EVENTS WHICH ARE  INHERENTLY  SUBJECT TO
               INCOMPLETENESS AND INACCURACY.

               Section 4.19 Title.

                    4.19.1  As of the  Closing  Date,  Seneca-Upshur  will  have
               Defensible Title, free and clear of all Encumbrances  (other than
               Permitted Encumbrances),  to the Business Leases and the Business
               Fee  Mineral  Interests,  except for those  matters  set forth in
               Section 4.19 of THX's Disclosure Schedule.

                    4.19.2  THX has and will  transfer  at  Closing to THEC good
               title to, or valid  leasehold  interest  in, all of the  Business
               Assets  (other than the Business  Leases and Business Fee Mineral
               Interests,  title to which is addressed in Section 4.19.1 above),
               free  and  clear  of  all  Encumbrances,   except  for  Permitted
               Encumbrances.

               Section  4.20   Sufficiency  of  Assets.   The  Business   Assets
          constitute all of the assets,  rights and properties  used or held for
          use in the  conduct  of the  Business  in  all  material  respects  as
          currently  conducted,  and there are no assets,  rights or  properties
          (other than the Excluded  Assets)  which have been used in the conduct
          of the Business  that THX will retain  following  the  Closing.  Since
          acquiring  Seneca-Upshur  from KeySpan in 1996,  Seneca-Upshur has not
          conducted any activities other than the conduct of the Business.

               Section  4.21  No  Sale  of  EnerVest  Assets.  Neither  THX  nor
          Seneca-Upshur  has  transferred,  sold or  otherwise  disposed  of any
          assets it acquired  pursuant to the EnerVest  Agreement (other than in
          connection with the transactions contemplated herein).

               Section 4.22  Financing.  THX has  available  capacity  under its
          Amended and  Restated  Credit  Agreement to borrow that portion of the
          Cash Amount that is to be borrowed by THX.

               Section  4.23  Condition  of  Personal  Property.  Each  item  of
          Contributed  Business Equipment has been maintained in accordance with
          the Business's  customary practices and is in good operating condition
          and repair, normal wear and tear excepted.

               Section 4.24 Brokerage Fees and Commissions.  Except as set forth
          in  Section  4.24  of  THX's  Disclosure  Schedule,  neither  THX  nor
          Seneca-Upshur   has  incurred  any  obligation  or  entered  into  any
          agreement  for any  investment  banking,  brokerage or finder's fee or
          commission  in  respect  of  the  transactions  contemplated  by  this
          Agreement  for which THEC,  KeySpan or  Seneca-Upshur  shall incur any
          liability.

               Section  4.25 No  Hedges.  There are no puts,  calls,  straddles,
          options,  swaps,  collars,  caps or other hedging  arrangements of any
          kind relating to the Business or to which  Seneca-Upshur or any of its
          assets are subject.

               Section 4.26 Disclaimers.

                    4.26.1 EXCEPT AS EXPRESSLY SET FORTH IN THIS ARTICLE IV, THX
               MAKES NO EXPRESS, STATUTORY OR IMPLIED WARRANTY OR REPRESENTATION
               OF ANY KIND,  INCLUDING  WARRANTIES RELATING TO (a) THE CONDITION


                                       23


               OR  MERCHANTABILITY  OF THE BUSINESS ASSETS OR (b) THE FITNESS OF
               THE BUSINESS ASSETS FOR A PARTICULAR PURPOSE.

                    4.26.2 THEC AND KEYSPAN HAVE HAD THE  OPPORTUNITY TO INSPECT
               THE  PROPERTIES  INCLUDED  IN THE  BUSINESS  FOR THE  PURPOSE  OF
               DETECTING  THE  PRESENCE  OF  NATURALLY   OCCURRING   RADIOACTIVE
               MATERIALS  ("NORM") AND MAN MADE  MATERIAL  FIBERS  ("MMMF") AND,
               EXCEPT TO THE EXTENT  ARISING  OUT OF ANY  BREACH OF 4.14(B)  AND
               4.14(E) OF THIS  AGREEMENT,  THEC AND KEYSPAN ARE RELYING  SOLELY
               UPON  THE  RESULTS  OF  SUCH  INSPECTION  AND  SHALL  ACCEPT  THE
               PROPERTIES  INCLUDED IN THE  BUSINESS IN THEIR "AS IS,  WHERE IS"
               CONDITION  AND "WITH ALL FAULTS'  WITH  RESPECT TO NORM AND MMMF.
               EXCEPT TO THE EXTENT  ARISING  OUT OF ANY  BREACH OF 4.14(B)  AND
               4.14(E) OF THIS AGREEMENT, THX DISCLAIMS ALL LIABILITY ARISING IN
               CONNECTION  WITH THE  PRESENCE OF NORM OR MMMF ON THE  PROPERTIES
               INCLUDED IN THE BUSINESS AND IF TESTS HAVE BEEN CONDUCTED BY THEC
               OR KEYSPAN FOR THE PRESENCE OF NORM OR MMMF,  THX  DISCLAIMS  ANY
               WARRANTY  RESPECTING  THE ACCURACY OF SUCH TESTS OR RESULTS.  THX
               DISCLAIMS ALL LIABILITY  ARISING IN CONNECTION  WITH THE PRESENCE
               OF ABANDONED OR PLUGGED WELLS ON THE  PROPERTIES  INCLUDED IN THE
               BUSINESS AS WELL AS ANY LIABILITY TO PLUG,  REPLUG AND/OR ABANDON
               ANY AND ALL WELLS  LOCATED ON THE LEASES IN  ACCORDANCE  WITH THE
               APPLICABLE  RULES,  REGULATIONS AND  REQUIREMENTS OF GOVERNMENTAL
               AUTHORITIES.

                    4.26.3 EXCEPT AS EXPRESSLY SET FORTH IN THIS AGREEMENT,  THX
               MAKES  NO  WARRANTY  OR  REPRESENTATION,  EXPRESS,  STATUTORY  OR
               IMPLIED,  AS TO (a) THE ACCURACY,  COMPLETENESS OR MATERIALITY OF
               ANY DATA, INFORMATION, PROJECTIONS, ESTIMATES, BUDGETS OR RECORDS
               FURNISHED  TO  THEC  OR  KEYSPAN  OR  THEIR   REPRESENTATIVES  IN
               CONNECTION   WITH  THE   BUSINESS   (INCLUDING   THE  ASSETS  AND
               LIABILITIES  THEREOF),  (b) THE  CURRENT  OR FUTURE  BUSINESS  OR
               OPPORTUNITIES OF SUBSIDIARY OR THE BUSINESS,  (c) THE QUALITY AND
               QUANTITY OF  HYDROCARBON  RESERVES (IF ANY)  ATTRIBUTABLE  TO THE
               PROPERTIES  INCLUDED  IN THE  BUSINESS,  (d) THE  ABILITY  OF THE
               PROPERTIES  INCLUDED  IN THE  BUSINESS  TO PRODUCE  HYDROCARBONS,
               INCLUDING   PRODUCTION  RATES,  DECLINE  RATES  AND  RECOMPLETION
               OPPORTUNITIES,  (e)  REGULATORY  MATTERS,  OR (f) THE  PRESENT OR
               FUTURE VALUE OF THE ANTICIPATED INCOME, COSTS OR PROFITS, IF ANY,
               TO BE DERIVED FROM THE PROPERTIES INCLUDED IN THE BUSINESS.

                                   Article V.
               REPRESENTATIONS AND WARRANTIES OF THEC AND KEYSPAN

         THEC and KeySpan hereby jointly and severally represent and warrant to
THX as follows:

     Section 5.1  Organization.  Each of THEC and KeySpan is a corporation  duly
organized,  validly  existing  and  in  good  standing  under  the  laws  of the


                                       24


jurisdiction of its incorporation and has the requisite corporate power to carry
on its business as it is now being conducted.

     Section  5.2  Authorization.  Each of THEC and  KeySpan  has the  requisite
corporate  power and  authority to execute and deliver this  Agreement,  the Tax
Matters  Agreement and the other  Ancillary  Agreements  and to  consummate  the
transactions  contemplated  hereby and thereby and the execution and delivery by
THEC and  KeySpan of this  Agreement,  the Tax Matters  Agreement  and the other
Ancillary   Agreements  and  the   consummation  by  THEC  and  KeySpan  of  the
transactions  contemplated  hereby  and  thereby  have  been  duly  and  validly
authorized  by the board of directors of each of THEC and KeySpan,  and no other
corporate  proceedings on the part of THEC or KeySpan are necessary to authorize
this Agreement,  the Tax Matters Agreement or the other Ancillary  Agreements or
to consummate  the  transactions  contemplated  hereby or thereby.  Each of this
Agreement, the Tax Matters Agreement and the other Ancillary Agreements has been
duly and validly  executed and delivered by THEC and KeySpan and constitutes the
legal,  valid and binding  obligation  of each of THEC and KeySpan,  enforceable
against THEC and KeySpan in accordance with its terms, subject to (a) applicable
bankruptcy,  insolvency,  reorganization,  moratorium, and other similar laws of
general application with respect to creditors, (b) general principles of equity,
and (c) the power of a court to deny  enforcement  of remedies  generally  based
upon public policy.

     Section 5.3 Consents and Approvals; No Violation. Neither the execution and
delivery of this  Agreement,  the Tax Matters  Agreement and the other Ancillary
Agreements by THEC and KeySpan, as applicable,  nor the consummation by THEC and
KeySpan of the transactions  contemplated  hereby or thereby,  will (a) violate,
conflict with or result in a breach of any provision of the governing  documents
of THEC or KeySpan,  (b) require any consent,  approval,  order,  authorization,
waiver or License  of, or filing  with or  notification  to, any third  party or
Governmental  Authority,  except  (i) as set  forth  in  Section  5.3 of  THEC's
Disclosure  Schedule,  (ii) any consents,  approvals,  authorizations or waivers
normally   obtained  after  the  consummation  of  transactions  of  the  nature
contemplated  by this  Agreement,  or (iii)  where the  failure  to obtain  such
consent,  approval, order,  authorization,  waiver or License, or the failure to
make such filing or notification,  would not,  individually or in the aggregate,
materially  adversely  affect  THEC's or  KeySpan's  ability to  consummate  the
transactions  contemplated  by this Agreement,  or (c) violate any order,  writ,
injunction,  decree, statute, rule, or regulation applicable to THEC or KeySpan,
except  for  violations  which  would  not,  individually  or in the  aggregate,
materially  adversely  affect  THEC's or  KeySpan's  ability to  consummate  the
transactions contemplated by this Agreement.

     Section 5.4 THEC THX Shares.  The THEC THX Shares are owned by THEC, and as
of the Closing Date,  the THEC THX Shares will be  transferred  to THX, free and
clear of any Encumbrances.

     Section  5.5  Litigation.  Except  as set  forth in  Section  5.5 of THEC's
Disclosure  Schedule,  there are no Actions  pending or, to THEC's or  KeySpan's
knowledge,  threatened against THEC or KeySpan that would reasonably be expected
to materially  adversely  affect THEC's or KeySpan's  ability to consummate  the
transactions  contemplated  by this  Agreement,  and there are no  judgments  or


                                       25


outstanding  orders,  injunctions,  decrees,  stipulations  or  awards  (whether
rendered by a court or administrative  agency or by arbitration) against THEC or
KeySpan that would reasonably be expected to materially  adversely affect THEC's
or  KeySpan's  ability  to  consummate  the  transactions  contemplated  by this
Agreement.

     Section 5.6 Acquisition of Seneca-Upshur Shares for Investment.  THEC is an
accredited  investor under Regulation D of the Securities Act, and THEC has such
knowledge  and  experience  in financial  and business  matters,  including,  in
particular,  the oil and gas  industry,  that it is  capable of  evaluating  the
merits and risks of its purchase of the Seneca-Upshur  Shares.  THEC and KeySpan
confirm  that THX has made  available  to THEC and  KeySpan the  opportunity  to
review THX's and Seneca-Upshur's files,  materials,  data, and other information
relating to Seneca-Upshur and the Business, to ask questions of the officers and
management  employees  of  THX  and  Seneca-Upshur,  and to  acquire  additional
information about the business and financial  condition of Seneca-Upshur.  Prior
to entering into this Agreement,  THEC and KeySpan were advised by their counsel
and such other persons they have deemed  appropriate  concerning  this Agreement
and other  documents  executed or  delivered  in  connection  herewith.  THEC is
acquiring the Seneca-Upshur Shares for investment and not with a view toward, or
for sale in  connection  with,  any  distribution  thereof,  or with any present
intention of distributing or selling the Seneca-Upshur  Shares. THEC understands
that the Seneca-Upshur  Shares may not be sold,  transferred,  offered for sale,
pledged,  hypothecated,  or otherwise disposed of without registration under the
Securities Act, except pursuant to an exemption from such registration available
thereunder, and without compliance with state or foreign securities laws,

     Section  5.7   Acknowledgements.   Except  with   respect  to  the  express
representations,  warranties  and covenants of THX contained in this  Agreement,
THEC  and  KeySpan  have  not  relied  on  any  statements  by THX or any of its
representatives, consultants or advisors in making their respective decisions to
enter into this  Agreement.  Subject to and without  altering or  affecting  the
representations  and  warranties  in Section  4.14 of this  Agreement,  THEC and
KeySpan  acknowledge  and understand that (a) the Business Assets have been used
for exploring, developing, producing, treating and transporting oil and gas, (b)
spills of wastes,  crude oil,  produced  water,  hazardous  substances and other
materials may have occurred in the past with respect to the Business Assets, (c)
there is a possibility  that there are currently  unknown,  unplugged  abandoned
wells,  plugged  wells,  pipelines  and other  equipment  on or  underneath  the
property included in the Business Assets and (d) the Business Assets may contain
asbestos  or NORM,  which  may affix or  attach  itself to the  inside of wells,
materials  and  equipment as scale or in other forms or which may be included in
wells,  materials and equipment or may have been buried or otherwise disposed of
on the properties included in the Business Assets.

                                  Article VI.
                            COVENANTS AND AGREEMENTS

     Section 6.1 Employee Matters.

               6.1.1 As of the close of business on the Closing  Date,  THX will
          terminate  each of the  employees  identified  on  Exhibit E  attached
          hereto who are  active  employees  of THX at such time (the  "Business
          Employees").

               6.1.2 The  Business  Employees  who report to work for KeySpan or
          Seneca-Upshur on the first business day immediately  after the Closing


                                       26


          are  referred  to herein as the  "Transferred  Employees."  KeySpan or
          Seneca-Upshur shall offer to employ each Transferred  Employee for the
          period  commencing  immediately  after  the close of  business  on the
          Closing Date until the first anniversary of the Closing Date, (a) at a
          base  salary or base  hourly rate that is no less than the base salary
          or base hourly rate such  Transferred  Employee  was paid by THX as of
          the  Closing  Date,  (b) with a  vacation  policy  that is at least as
          favorable as the vacation policy provided to such Transferred Employee
          immediately  before the Closing,  and (c) with such other compensation
          and  benefits  (the  "Benefits  Package")  as are  comparable,  in the
          aggregate,  to the other  compensation  and  benefits  (excluding  any
          equity-based  compensation and benefits)  provided to such Transferred
          Employee  by THX  under the  Benefit  Plans  immediately  prior to the
          Closing;  provided,  that  the  medical,  dental  and  life  insurance
          benefits   provided  to  Transferred   Employees  and  their  eligible
          dependents by KeySpan shall be provided at no cost to the  Transferred
          Employee during such one-year period; provided,  further, that nothing
          in  this  Agreement  shall  prevent  KeySpan  or  Seneca-Upshur   from
          terminating the employment of any Transferred Employee at any time for
          any reason or, on or following  the first  anniversary  of the Closing
          Date,  from altering the terms or conditions  (including  compensation
          and benefits) of any Transferred  Employee.  Further, each Transferred
          Employee  shall  receive  credit for his or her length of service with
          THX for  eligibility  to  participate  and vesting  purposes under all
          KeySpan benefit plans, programs and policies in which such Transferred
          Employee participates  (excluding any post-retirement  welfare plans),
          including  the KeySpan  401(k)  plan,  cash  balance  pension plan and
          vacation  policy,  but  only  to the  same  extent  such  service  was
          recognized by THX under a comparable Benefit Plan immediately prior to
          the Closing  Date and  excluding  where such credit would result in an
          unintended  duplication  of  benefits;  provided,  the THX 401(k) plan
          shall be deemed to be comparable  to the KeySpan cash balance  pension
          plan for  purposes of such  service  credit.  THX shall  provide  such
          information,  as KeySpan shall reasonably require to enable KeySpan to
          provide such service credit.

               6.1.3 On or prior to the Closing  Date,  THX shall take  whatever
          action  is  necessary  to cause  each  Transferred  Employee  who is a
          participant  in the  THX  401(k)  plan  to  fully  vest  in his or her
          accounts  under such plan as of the Closing Date. THX will timely make
          all required matching  contributions  under the THX 401(k) plan to the
          accounts of each Transferred Employee with respect to all compensation
          earned by such  Transferred  Employee on or prior to the Closing Date.
          On or prior to the Closing  Date,  THX shall take  whatever  action is
          necessary  to cause each  Transferred  Employee who holds any unvested
          stock option to purchase shares of THX stock to become fully vested in
          such stock option as of the Closing Date.

               6.1.4 THX shall be responsible for payment of accrued, but unused
          vacation  for periods on and prior to the Closing  Date and for timely
          payment as required by law of all wages,  salaries,  bonuses,  if any,
          and other  compensation  and  benefits  due with respect to service of
          Business  Employees  completed  on  and  prior  to  the  Closing  Date
          (including  without limitation welfare claims incurred but not paid on
          or prior to the Closing  Date).  On or promptly  following the Closing
          Date,  THX shall pay to each  Transferred  Employee a pro-rated  bonus
          equal to such Transferred  Employee's  target bonus for the applicable
          year multiplied by a fraction, the numerator of which is the number of


                                       27


          days during such year through and  including  the Closing Date and the
          denominator of which is 365.

               6.1.5 THX shall be  responsible  for offering and  providing  any
          continuation  coverage  required  under  Section 4980B of the Code and
          Part 6 of Subtitle B of Title I of ERISA with  respect to any Business
          Employee.

               6.1.6 In the event that a  Transferred  Employee is terminated or
          laid off by KeySpan,  other than for cause,  within one year following
          the Closing Date,  KeySpan  agrees to pay such  terminated or laid off
          Transferred  Employee  severance  equal to no less than the  severance
          such Transferred  Employee would have received under the THX Change of
          Control Plan which is attached as Exhibit F (the "COC Plan") had he or
          she  remained  an  employee  of THX and such  termination  was  deemed
          (solely  for  purposes  of  calculating  severance  benefits)  to be a
          termination by THX without Cause within one year following a Change of
          Control  (as those  terms are  defined  under the COC  Plan).  For the
          avoidance  of  doubt,   the  parties   agree  that  the   transactions
          contemplated  under  this  Agreement  do not  constitute  a Change  of
          Control under the COC Plan or under any other  compensation or benefit
          plan,  policy,  program,  agreement  or  arrangement  of  THX  or  its
          Affiliates.

               6.1.7  For  the   avoidance   of  doubt,   subject  to  KeySpan's
          obligations  in  Section  6.1.6   relating  to  certain   terminations
          following the Closing Date,  THX shall be  responsible  for, and shall
          indemnify  Seneca-Upshur,  THEC and KeySpan for liability  related to,
          severance  or  termination  pay or  benefits  (whether  pursuant  to a
          benefit plan,  policy,  agreement or other  arrangement or pursuant to
          applicable  Law) arising on or before the Closing Date,  including any
          and all such  Liabilities  related to  Business  Employees  who do not
          become Transferred Employees.

               6.1.8 Until the third  anniversary  of the Closing Date,  none of
          THX, any of its  Affiliates  or any of their  respective  directors or
          employees  shall,  without the prior written consent of KeySpan in its
          sole discretion,  induce, solicit or encourage,  or attempt to induce,
          solicit or encourage,  whether directly or indirectly, any Transferred
          Employee.

               6.1.9  Promptly  following the date of this  Agreement,  THX will
          provide  KeySpan with respect to each Benefit Plan,  full and complete
          copies of the most recent plan document and any amendment thereto.

     Section 6.2 Further Assurances.

               6.2.1 Subject to the terms and  conditions  hereof,  from time to
          time,  each of THEC and THX shall,  and shall cause  their  respective
          Affiliates  to use all  commercially  reasonable  efforts to take,  or
          cause to be taken,  all actions,  and to do, or cause to be done,  all
          things  reasonably  necessary,  proper  or  advisable,   including  as
          required by applicable Laws, to assure fully to Seneca-Upshur  and its
          successors  or  permitted  assigns,  all of the  Business  Assets  and
          Business  Liabilities intended to be conveyed to, owned by, or assumed
          by Seneca-Upshur under this Agreement and the Ancillary Agreements and
          to assure fully to THX, and its  respective  successors  and permitted


                                       28


          assigns,  the  maintenance  by THX  of the  Excluded  Assets  and  the
          assumption by Seneca-Upshur of the Business Liabilities intended to be
          assumed  by  Seneca-Upshur  under  this  Agreement  and the  Ancillary
          Agreements,   and  to  otherwise  make   effective  the   transactions
          contemplated  hereby and thereby  (including (a) transferring  back to
          THX any Excluded  Asset,  Retained  Liability  or item  relating to or
          included in the Retained Business, respectively, which Excluded Asset,
          Retained  Liability  or item  relating to or included in the  Retained
          Business was transferred to THEC indirectly through the acquisition of
          the  Seneca-Upshur  Shares  at the  Closing  and (b)  transferring  to
          Seneca-Upshur any asset or liability contemplated by this Agreement to
          be a Business Asset or a Business Liability, respectively, which asset
          or liability was not transferred to  Seneca-Upshur  at or prior to the
          Closing).

               6.2.2 In furtherance and without limitation to the foregoing, THX
          shall,  and  shall  cause  its  Affiliates  to,  use all  commercially
          reasonable  efforts  to  cause  the  Licenses  to  be  transferred  to
          Seneca-Upshur or, if any such Licenses are not  transferable,  THX, at
          the request and expense of THEC, shall reasonably assist Seneca-Upshur
          in  obtaining  new  Licenses so that it may operate the Business as of
          the Closing Date in compliance with applicable Laws.

     Section 6.3  Interim  Operating  Covenant.  Between the date hereof and the
Closing,  except with the prior written consent of KeySpan,  THX shall and shall
cause  Seneca-Upshur  to conduct the Business in the ordinary course of business
consistent  with past  practice.  In  furtherance  and not in  limitation of the
foregoing,  THX hereby covenants to THEC and KeySpan that it will and will cause
Seneca-Upshur to (a) keep and maintain the assets and properties of the Business
in substantially  the same operating  condition and repair (normal wear and tear
excepted)  as  currently  maintained,  (b)  preserve  substantially  intact  the
business  organization and generally maintain the goodwill of, and relationships
with, the suppliers, contractors, licensors, licensees, distributors,  employees
and customers of the Business,  (c) not grant any  Encumbrance on any portion of
the  Business,  the  Seneca-Upshur  Shares or any Business  Assets,  (d) create,
incur, assume or guaranty and Indebtedness, in relation to the Business, and (e)
comply with all applicable Laws in all material respects.

     Section 6.4 Confidentiality; Access to Records.

               6.4.1 From and after the Closing Date, THX shall not use (or take
          any  action to use) in any  manner  detrimental  to  KeySpan,  THEC or
          Seneca-Upshur,  and shall  hold,  and shall cause its  Affiliates  and
          their  respective  officers,  directors,  employees,  representatives,
          consultants,  advisors  and agents,  to not use (or take any action to
          use) in any manner  detrimental to KeySpan,  THEC or Seneca-Upshur and
          to hold, in  confidence,  unless  compelled to disclose by judicial or
          administrative  process or by other  requirements of Law or regulation
          (including  the Securities Act and the Exchange Act) in which case THX
          will notify KeySpan so that KeySpan may seek an appropriate protective
          order or waive  compliance with this Section 6.4.1,  all  Confidential
          Business  Information,  except to the  extent  that such  Confidential
          Business Information has been or has become (a) generally available to
          the public other than as a result of  disclosure by such person or (b)
          known to the Person receiving such Confidential  Business  Information
          before  the  date  of   disclosure  of  such   Confidential   Business
          Information  to such Person.  Nothing  herein shall  preclude THX, its


                                       29


          subsidiaries  or  any  of  their   respective   officers,   directors,
          employees, representatives, consultants, advisors or agents, receiving
          Confidential   Business   Information  from  using  and/or  disclosing
          information  received  from a third  party  to the  extent  rightfully
          permitted by the third party.

               6.4.2 THX recognizes that it may have documents,  books, records,
          work papers and information,  whether in written, magnetic, electronic
          or other form  (collectively,  "Records") which relate to the Business
          with  respect to the period or matters  arising  prior to the Closing,
          including  Records  pertaining  to the Business  Assets,  the Business
          Liabilities and Seneca-Upshur's employees, assets and liabilities (the
          "Business  Records") or other Records  relating to the  Business.  THX
          will use, and will cause its respective  Affiliates to use, reasonable
          commercial   efforts  to  refrain  from  using  Business  Records  and
          Confidential  Business  Information,  except as  provided  for in this
          Agreement  or  the  Ancillary   Agreements,   and  will  preserve  the
          confidentiality  of any information  contained in the Business Records
          and Confidential  Business  Information.  THX further  recognizes that
          KeySpan or its Affiliates may need access to such Business Records and
          other  Records   after  the  Closing.   Upon   KeySpan's,   THEC's  or
          Seneca-Upshur's reasonable request, THX shall provide KeySpan, THEC or
          Seneca-Upshur  and their  respective  employees,  representatives  and
          agents access to, and the right to photocopy (at KeySpan's,  THEC's or
          Seneca-Upshur's  expense),  during normal business hours on reasonable
          advance  notice,  such  reasonably  requested  Records.  THX shall use
          reasonable  best  efforts to  maintain  all such  Records for the same
          length  of time  that THX  maintains  its own  Records,  or,  at THX's
          discretion  or at  KeySpan's,  THEC's  or  Seneca-Upshur's  reasonable
          request (at KeySpan's,  THEC's or Seneca-Upshur's  expense),  transfer
          any such Records to THEC or Seneca-Upshur.

               6.4.3 Notwithstanding any provision herein to the contrary,  from
          and after the Closing,  Records  pertaining to Taxes shall be governed
          solely by the Tax Matters Agreement.

     Section 6.5 THX Shares  Retained by THEC.  From and after the Closing  Date
until the third  anniversary  of the  Closing,  THEC and KeySpan  shall not, and
shall cause their Affiliates not to, directly own or acquire or agree to acquire
any shares of THX Common  Stock,  which will have the effect of  increasing  the
number of shares of THX Common Stock that KeySpan and its Affiliates  (including
THEC) will own, in the  aggregate,  following  the Closing  above that number of
shares owned by KeySpan and its Affiliates (including THEC) on the Closing Date,
appropriately adjusted for any stock dividend, stock split, reverse stock split,
share combination,  reclassification,  recapitalization  or similar  transaction
with respect to the THX Common Stock.

     Section 6.6 Intercompany Accounts and Bank Debt.

               6.6.1 Prior to or at the Closing,  THX will cancel and  eliminate
          without  liability  to  Seneca-Upshur  all  intercompany  accounts and
          Liabilities  of  Seneca-Upshur  to THX or any of its  subsidiaries  or
          affiliates as of the Closing Date.

               6.6.2  Prior to or at the  Closing,  THX will  cause  any and all
          Indebtedness  of  Seneca-Upshur  to be paid  in  full  and any and all


                                       30


          Encumbrances  securing  any such  Indebtedness  to be released in each
          case without liability to Seneca-Upshur,  and THX will obtain the full
          and unconditional release of Seneca-Upshur from the lenders thereunder
          as of the Closing Date.

               6.6.3 Prior to or at the  Closing,  THX shall cause all  accounts
          receivable,  accounts  payable  (including  accrued Taxes  relating to
          periods prior to Closing) and trade payables relating to periods prior
          to Effective time of Seneca-Upshur to be transferred to THX. After the
          Closing, invoices for goods purchased, or services performed, prior to
          the  Effective  Time will be for the account of THX and  invoices  for
          goods  purchased,  or services  performed,  at and after the Effective
          Time shall be for the  account of  Seneca-Upshur.  After the  Closing,
          Seneca-Upshur  shall  promptly remit to THX any invoices for which THX
          is responsible  pursuant to this Section 6.6.3, and THX shall promptly
          pay them. After the Closing, THX shall promptly remit to Seneca-Upshur
          any invoices for which  Seneca-Upshur is responsible  pursuant to this
          Section 6.6.3, and Seneca-Upshur shall promptly pay them.

     Section 6.7 THX Compliance with  Underwriting  Agreement.  THX shall comply
with  all  of  its  covenants,   agreements  and  obligations  pursuant  to  the
Underwriting  Agreement for the benefit of KeySpan and THEC. THX shall not amend
or modify the  Underwriting  Agreement  or grant any waiver with  respect to the
Underwriting Agreement.

     Section  6.8  Governance.  For so long as THEC  has the  right  to  appoint
members to the board of directors of THX (the  "Board") as more fully  described
below, THX hereby agrees to take such action as may be required under applicable
Law to cause the Board to consist at all times of not more than nine  directors,
to include in the slate of nominees  recommended  by the Board the  designees of
THEC specified below and to use its best efforts to support the election of each
such  nominee  of THEC.  At any time  THEC and its  Affiliates  hold THX  Shares
constituting at least 10% of the issued and  outstanding THX Shares,  THEC shall
have the right to designate two members of the slate of directors being proposed
by THX to be elected to the Board,  and at any time THEC and its Affiliates hold
THX  Shares  constituting  less than 10% but  greater  than 5% of the issued and
outstanding  THX  Shares it shall  have the right to  appoint  one member of the
slate of directors  being proposed by THX to be elected to the Board.  Once THEC
and its  Affiliates  hold THX Shares  constituting  5% or less of the issued and
outstanding  THX Shares,  it shall not have the right to appoint  members to any
slate of  directors  being  proposed  by THX to be elected to the Board.  In the
event  that  a  vacancy  is  created  at any  time  by  the  death,  disability,
retirement,  resignation or removal (with or without cause) of any such designee
of THEC,  THX shall  cause the  vacancy  created  thereby  to be filled by a new
designee of THEC as soon as possible and THX hereby  agrees to take, at any time
and from time to time, all actions necessary to accomplish the same.

     Section 6.9  Issuances of THX Common  Stock.  For a period from the Closing
Date and ending on August 15, 2004, THX shall not, directly or indirectly, offer
for sale, sell,  contract to sell,  issue or otherwise  dispose of any shares of
THX Common Stock or securities  convertible  into or exchangeable for THX Common
Stock (other than THX Common Stock issued  pursuant to employee  benefit  plans,
qualified  stock option plans or other employee  compensation  plans existing on
the date  hereof or  pursuant  to  currently  outstanding  options,  warrants or
rights).

                                       31



     Section  6.10  Insurance.   To  the  extent  that  any  insurance  policies
controlled by THX or any of its  Affiliates  cover any loss,  liability,  claim,
damage or  expense  relating  to the  Business  or any asset,  employee  or part
thereof  which  relates to or arises  out of  occurrences  prior to the  Closing
("Pre-Closing Business Liabilities"), and such insurance policies continue after
Closing to permit claims to be made thereunder with respect to such  Pre-Closing
Business  Liabilities,   THX  shall  cooperate  and  shall  cause  its  relevant
Affiliates to cooperate  with KeySpan,  THEC and Seneca in submitting  claims on
behalf of Keyspan,  THEC and Seneca  under such  insurance  policies,  and shall
assign its rights to, and promptly pay over, any recoveries  thereunder (subject
to deduction for any applicable  deductibles  paid by THX) to Keyspan,  THEC and
Seneca-Upshur.

                                  Article VII.
                                   TAX MATTERS

     Notwithstanding anything to the contrary in this Agreement,  from and after
the Closing, except as expressly provided in the Tax Matters Agreement,  (a) the
parties' sole and exclusive representations,  warranties,  covenants, agreements
or other obligations (including indemnities or any obligations) arising pursuant
to this Agreement, by Laws or otherwise with respect to tax matters (interpreted
in its  broadest  sense)  including  the tax  consequences  of the  transactions
contemplated in this Agreement and any other subject matters  referred to in the
Tax  Matters  Agreement  shall  be as  set  forth  therein;  and  (b)  no  other
representation,   warranty,   covenant,   agreement  or  obligation   (including
indemnities or any obligations)  arising pursuant to this Agreement,  by Laws or
otherwise shall be deemed to apply to such matters.

                                 Article VIII.
                              CONDITIONS TO CLOSING

     Section 8.1 Mutual  Conditions.  The  respective  obligations of each party
hereto to consummate the  transactions  contemplated  by this Agreement shall be
subject to the fulfillment or, if legally  permitted,  waiver at or prior to the
Closing of the following conditions:

               8.1.1 No Governmental  Authority of competent  jurisdiction shall
          have enacted,  issued,  promulgated,  enforced or entered any statute,
          rule, regulation,  judgment,  decree, injunction or other order of any
          nature that  prohibits,  enjoins or restrains the  consummation of the
          transactions contemplated by this Agreement.

               8.1.2 THX shall have successfully completed the Equity Offering.

               8.1.3 Each of the  Ancillary  Agreements  shall be  executed  and
          entered into by each of the parties thereto.

     Section 8.2 Conditions to THEC's and KeySpan's Obligations. The obligations
of  THEC  and  KeySpan  to  consummate  the  transactions  contemplated  by this
Agreement  shall be subject  to the  fulfillment  or waiver by THEC and  KeySpan
prior to or at the Closing of each of the following conditions:

               8.2.1  The   representations   and  warranties  of  THX  and  its
          Affiliates  set  forth  in  Article  IV of  this  Agreement  or in any


                                       32


          agreement or certificate  delivered  pursuant to the provisions hereof
          or in connection with the  transactions  contemplated  hereby shall be
          true and correct as of the date  hereof and as of the Closing  (except
          that representations and warranties made as of a specified date, shall
          be true and correct only as of such  specified  date),  and THEC shall
          have received a certificate,  dated the Closing Date, signed on behalf
          of THX by an  appropriate  officer  of THX to such  effect;  provided,
          however, that for purposes of this paragraph, such representations and
          warranties  shall be deemed to be true and correct  unless the failure
          or failures of such  representations  and warranties to be so true and
          correct,  either individually or in the aggregate,  and without giving
          effect to any  qualification  as to  materiality  or Material  Adverse
          Effect set forth in such representations or warranties,  has had or is
          reasonably likely to have a Material Adverse Effect on the Business or
          Seneca-Upshur.

               8.2.2 THX and Seneca-Upshur  shall have performed in all material
          respects  each  obligation  and  agreement  to be performed by it, and
          shall  have  complied  in all  material  respects  with each  covenant
          required by this  Agreement to be performed or complied  with by it at
          or prior to the Closing,  and THEC shall have received a  certificate,
          dated the  Closing  Date,  signed  on behalf of THX by an  appropriate
          officer of THX to such effect.

               8.2.3  Since  the date  hereof,  there  shall  not have  been any
          Material Adverse Effect with respect to the Business or Seneca-Upshur.

               8.2.4 Prior to or at the  Closing,  THX shall have  delivered  to
          THEC the items to be delivered pursuant to Section 2.3.

               8.2.5 Prior to or at the  Closing,  the  Contribution  shall have
          been completed.

     Section  8.3  Conditions  to THX's  and  Seneca-Upshur's  Obligations.  The
obligations of THX and Seneca-Upshur to consummate the transactions contemplated
by this Agreement  shall be subject to the  fulfillment or waiver at or prior to
the Closing of each of the following conditions:

               8.3.1 The  representations  and  warranties  of THEC set forth in
          Article  V of  this  Agreement  or in  any  agreement  or  certificate
          delivered  pursuant to the provisions hereof or in connection with the
          transactions  contemplated  hereby shall be true and correct as of the
          date hereof and as of the Closing  (except  that  representations  and
          warranties  made as of a specified date shall be true and correct only
          as of such specified date), and THX shall have received a certificate,
          dated the  Closing  Date,  signed on behalf of THEC by an  appropriate
          officer of THEC to such effect;  provided,  however, that for purposes
          of this paragraph, such representations and warranties shall be deemed
          to be  true  and  correct  unless  the  failure  or  failures  of such
          representations  and  warranties  to be so true  and  correct,  either
          individually  or in the  aggregate,  and without  giving effect to any
          qualification  as to materiality or Material  Adverse Effect set forth
          in such representations or warranties, has had or is reasonably likely
          to have a material adverse effect on the ability of THEC to consummate
          the transactions contemplated hereby.

               8.3.2 THEC shall have  performed  in all material  respects  each
          obligation  and  agreement  to be  performed  by it,  and  shall  have


                                       33


          complied in all material  respects with each covenant required by this
          Agreement to be  performed  or complied  with by it at or prior to the
          Closing, and THX shall have received a certificate,  dated the Closing
          Date,  signed on behalf of THEC by an  appropriate  officer of THEC to
          such effect.

               8.3.3 Prior to or at the  Closing,  THEC shall have  delivered to
          THX the items to be delivered pursuant to Section 2.4.

     Section 8.4 None of THX,  Seneca-Upshur  or THEC may rely on the failure of
any condition set forth in this Article VIII to be satisfied if such failure was
caused by such  party's  failure to act in good  faith or to use its  reasonable
commercial efforts to cause the Closing to occur as required by Section 6.2.1.

                                   Article IX.
                                   TERMINATION

     Section 9.1 Termination. This Agreement may be terminated at any time prior
to the consummation of the Closing under the following circumstances:

               9.1.1 by mutual written consent of THX and KeySpan;

               9.1.2 by either  KeySpan or THX upon written  notice to the other
          if the Closing  shall not have been  consummated  on or before June 8,
          2004;  provided that the right to terminate this Agreement  under this
          Section  9.1.2 shall not be  available  to a party if such  party's or
          such  party's  Affiliate's  willful act or willful  failure to act has
          been the cause of or  resulted  in the  failure  of the  Closing to be
          consummated on or before June 8, 2004;

               9.1.3  by  KeySpan  upon  written  notice  to THX,  if any of the
          conditions  to the  Closing set forth in Section 8.2 shall have become
          incapable  of  fulfillment  by June 8,  2004 and  shall  not have been
          waived in writing by KeySpan;

               9.1.4 by either THX or KeySpan upon  written  notice to the other
          that the  conditions  to the  Closing  set forth in  Section  8.1 have
          become  incapable of fulfillment by June 8, 2004 due to changes in the
          law, regulations or interpretations of the IRS;

               9.1.5  by THX  upon  written  notice  to  KeySpan,  if any of the
          conditions  to the  Closing set forth in Section 8.3 shall have become
          incapable  of  fulfillment  by June 8,  2004 and  shall  not have been
          waived in writing by THX; or

               9.1.6 by either  KeySpan or THX upon written notice to the other,
          if there shall be in effect a final,  non-appealable  order of a court
          or  government   administrative   agency  of  competent   jurisdiction
          permanently   prohibiting  the   consummation   of  the   transactions
          contemplated hereby.

Notwithstanding  the foregoing or anything to the contrary in this  Agreement or
in any  Ancillary  Agreement,  no  party  will be  entitled  to  terminate  this
Agreement  pursuant to this  Section 9.1 on the basis of facts which were caused
by such  party's  own  breach of this  Agreement  and which have  prevented  the
satisfaction  of  any  condition  to  the  transactions   contemplated  by  this


                                       34


Agreement.  Any  termination  pursuant to this Section 9.1 must be effected by a
written instrument signed by the terminating party or parties,  which instrument
will specify the specific  section  hereof  pursuant to which this  Agreement is
being terminated.

     Section 9.2 Effect of Termination. In the event of the valid termination of
this  Agreement  pursuant  to  Section  9.1,  this  Agreement,  except  for  the
provisions  of (a) Section  6.4.1  relating to the  obligation of the parties to
keep confidential  certain  information  obtained by it, (b) Article XI, and (c)
this Section 9.2, shall become void and have no effect, without any liability on
the part of any party hereto or its directors, officers or stockholders.

                                   Article X.
           SURVIVAL OF REPRESENTATIONS AND WARRANTIES; INDEMNIFICATION

     Section 10.1 Survival of  Representations  and  Warranties.  Except for the
representations and warranties  contained in Sections 4.1 ("Due Organization and
Qualification of THX and Seneca-Upshur"),  4.2 ("Capitalization of THX and Title
to Seneca-Upshur Shares"), 4.3 ("Authorization of THX and Seneca-Upshur"),  4.24
("Brokerage   Fees  and   Commissions")   (collectively,   the  "Seller's  Title
Representations  and  Warranties"),  and 5.1  ("Due  Organization  of  THEC  and
KeySpan"), 5.2 ("Authorization of THEC and KeySpan") and 5.4 ("Title to THEC THX
Shares") (collectively,  the "Purchaser's Title Representations and Warranties")
which shall survive  indefinitely,  all of the  representations  and  warranties
provided for in this  Agreement or in any  agreement  or  certificate  delivered
pursuant  to the  provisions  hereof  or in  connection  with  the  transactions
contemplated  hereby  (including  the  Ancillary  Agreements)  shall survive the
Closing  until  the  first  anniversary  of  the  Closing;   provided  that  any
representations  and warranties shall survive with respect to, and to the extent
of, any claim for  indemnification  made in accordance with this Article X prior
to such  termination  date and any  representations  and  warranties  in the Tax
Matters  Agreement  shall be exclusively  governed by the survival  provision in
Section 5.10 of the Tax Matters Agreement.

     Section 10.2 Indemnification by THX.

               10.2.1  Subject to the  limitations  set forth in this Article X,
          THX  shall  indemnify  and  hold  harmless  THEC,  KeySpan  and  their
          respective   subsidiaries    (including,    following   the   Closing,
          Seneca-Upshur),   and  Affiliates,   and  their  respective  officers,
          directors,  employees,  agents and representatives,  and each of their
          heirs,   executors,   successors   and  assigns   (collectively,   the
          "Representatives"),  against  and in  respect  of any and all  Damages
          arising  out of,  resulting  from or incurred  in  connection  with or
          relating to:

                    10.2.1.1 any breach of a representation  or warranty made by
               THX or  Seneca-Upshur in this Agreement or any Schedule hereto or
               other  agreement or document  delivered in  connection  herewith,
               including  in each case the  circumstance  actually  constituting
               such breach;

                    10.2.1.2  any  breach,  failure  or  non-fulfillment  of any
               agreement or covenant of THX or  Seneca-Upshur  contained in this
               Agreement or in any Ancillary Agreement; or



                                       35


                    10.2.1.3 the Retained  Liabilities,  the Excluded  Assets or
               the Retained Business.

               10.2.2 Notwithstanding the foregoing and subject to the following
          sentence,  in the case of Damages incurred as a result of a breach set
          forth  in  Section   10.2.1.1,   (a)  THX  shall  not  be  liable  for
          indemnification  hereunder  unless and until the  aggregate  amount of
          such Damages  exceeds  $1,800,000  (the "THX Basket"),  in which event
          THEC and KeySpan shall collectively be entitled to indemnification for
          all  Damages  in excess of the THX  Basket,  (b) no claim for  Damages
          shall be counted toward the THX Basket unless such claim  individually
          exceeds $50,000 ("THX De Minimis"),  and (c) THX's aggregate liability
          shall  in no event  exceed  $30,000,000  (the  "THX  Cap");  provided,
          however  that there shall be no THX Basket,  THX De Minimis or THX Cap
          applicable to Damages arising under the Seller's Title Representations
          and Warranties.  In addition,  for the avoidance of doubt, there shall
          be no THX  Basket,  THX De  Minimis or THX Cap  applicable  to Damages
          arising  under  Sections  10.2.1.2 or 10.2.1.3  above or under the Tax
          Matters Agreement.

     Section 10.3 Indemnification by THEC and KeySpan.

               10.3.1  Subject to the  limitations  set forth in this Article X,
          THEC and KeySpan,  jointly and  severally,  shall  indemnify  and hold
          harmless  THX and its  Representatives,  against and in respect of any
          and  all  Damages  arising  out of,  resulting  from  or  incurred  in
          connection with or relating to:

                    10.3.1.1 any breach of a representation  or warranty made by
               THEC or KeySpan in this Agreement or any Schedule hereto or other
               agreement or document delivered in connection herewith, including
               in each case the circumstances actually constituting such breach;

                    10.3.1.2  any  breach,  failure  or  non-fulfillment  of any
               agreement  or  covenant  of THEC  or  KeySpan  contained  in this
               Agreement or any Ancillary Agreement; or

                    10.3.1.3 any Business Liability.

               10.3.2 Notwithstanding the foregoing and subject to the following
          sentence,  in the case of Damages incurred as a result of a breach set
          forth in Section  10.3.1.1,  (a) THEC and KeySpan  shall not be liable
          for indemnification hereunder unless and until the aggregate amount of
          such Damages exceeds $1,800,000 (the "KeySpan Basket"), in which event
          THX shall be entitled to indemnification  for all Damages in excess of
          the KeySpan  Basket;  (b) no claim for Damages shall be counted toward
          the KeySpan  Basket  unless such claim  individually  exceeds  $50,000
          ("KeySpan  De  Minimis"),  and  (c)  THEC's  and  KeySpan's  aggregate
          liability hereunder shall in no event exceed $30,000,000 (the "KeySpan
          Cap");  provided ,  however  that  there  shall be no KeySpan  Basket,


                                       36


          KeySpan De Minimis or KeySpan Cap applicable to Damages  arising under
          Purchaser's Title Representations and Warranties. In addition, for the
          avoidance  of doubt,  there  shall be no  KeySpan  Basket,  KeySpan De
          Minimis or KeySpan Cap  applicable  to  Sections  10.3.1.2 or 10.3.1.3
          above or under the Tax Matters Agreement.

     Section 10.4 Definition of Damage;  Determination of  Indemnification.  For
purposes of this  Article X,  "Damages"  shall mean,  collectively,  any and all
claims,  damages,   settlement  amounts,   penalties,   Liabilities  or  losses,
whatsoever  (other  than  punitive  or  exemplary  damages,  unless  punitive or
exemplary  damages are sought,  awarded or otherwise  imposed in any Third Party
Claim),  together with out-of-pocket  costs and expenses,  including  reasonable
fees and  disbursements  of  counsel,  accountants,  consultants  or experts and
expenses  of  investigation   suffered  or  incurred  by  a  party  entitled  to
indemnification  hereunder relating to or arising out of a matter giving rise to
a claim for indemnification  hereunder, such amounts to be (i) determined net of
(x) the insurance  proceeds which the  indemnified  party  actually  receives in
respect of such matter and (y) indemnity  payments which the  indemnified  party
actually  receives from parties other than the  indemnifying  party hereunder in
respect of such matter,  and (ii)  decreased by any Tax Benefit (or decreased by
any reduction in any Tax) actually  realized by the indemnified party that would
not have been  realized but for such Damages or the payment of any  indemnity in
respect thereof.  For purposes of this paragraph,  the indemnified party will be
deemed to  recognize a Tax Benefit with respect to a taxable year if, and to the
extent that, the indemnified party's cumulative  liability for Taxes through the
end of such taxable year,  calculated by excluding any Tax items attributable to
the Damages  and the receipt of  indemnity  payments  therefor  from all taxable
years, exceeds the indemnified party's actual cumulative tax liability for Taxes
through the end of such taxable year,  calculated by taking into account any Tax
items attributable to the Damages and the receipt of indemnity payments therefor
for all taxable years (to the extent  permitted by relevant Tax law and treating
such Tax items as the last items taken into account for any taxable year). When,
as, and if the  indemnified  party  recognizes any Tax Benefit  attributable  to
Damages after the making of indemnification payments therefor, and to the extent
such Tax Benefit has not  reduced the amount of such  indemnification  payments,
the indemnified  party will promptly after  recognition  thereof pay in cash the
amount  of  such  recognized  Tax  Benefit  to  an  account   specified  by  the
indemnifying party.

     Section 10.5 Notice.

               10.5.1 If any matter  shall  arise which may involve or give rise
          to a claim by THEC or  KeySpan  against  THX under the  provisions  of
          Section 10.2 or by THX against THEC or KeySpan under the provisions of
          Section  10.3 (an  "Indemnity  Claim"),  THEC (on  behalf of itself or
          KeySpan or both) or THX, as the case may be, shall give prompt written
          notice (a "Notice of Claim") of such Indemnity Claim, a description in
          reasonable  detail of the  factual  basis  thereof (to the extent such
          information is available), and the amount of indemnity sought (if then
          known  or  reasonably  determinable)  to THX  (if a  claim  by THEC or
          KeySpan) or to THEC (if a claim by THX); provided, that the failure to
          give  timely  notice  will  not  relieve  THX (if a  claim  by THEC or
          KeySpan) or THEC and  KeySpan (if a claim by THX) from the  obligation
          to  indemnify  against  such claim except to the extent that THX (if a
          claim by THEC or KeySpan) or THEC (if a claim by THX)  establishes  by
          competent evidence that it is materially prejudiced thereby.

               10.5.2 THX shall have 45 days after  receipt of a Notice of Claim
          to notify THEC in writing that THX disputes the  applicable  Indemnity
          Claim,  in whole or in part.  If THX within 45 days after receipt of a


                                       37


          Notice  of  Claim  notifies  THEC in  writing  that THX  disputes  the
          applicable  Indemnity  Claim, in whole or in part, then the provisions
          of Section  10.5.4 shall  apply.  If a Notice of Claim is made by THEC
          under  Section  10.5.1  hereof  and  if it  is  agreed  or  determined
          (pursuant to Section  10.5.4 or by a court of competent  jurisdiction)
          that THX is obligated to  indemnify  THEC or KeySpan,  or THX fails to
          notify  THEC and KeySpan  within 45 days after  receipt of a Notice of
          Claim  that  it  disputes  the  applicable   Indemnity   Claim,   such
          indemnification shall be paid promptly by wire transfer of immediately
          available funds to an account designated by THEC.

               10.5.3 THEC shall have 45 days after receipt of a Notice of Claim
          to notify THX in writing that THEC or KeySpan  disputes the applicable
          Indemnity  Claim,  in whole or in part.  If THEC  within 45 days after
          receipt  of a Notice of Claim  notifies  THX in  writing  that THEC or
          KeySpan disputes the applicable  Indemnity Claim, in whole or in part,
          then the  provisions  of Section  10.5.4 shall  apply.  If a Notice of
          Claim is made by THX under  Section  10.5.1 hereof and if it is agreed
          or determined  (pursuant to Section  10.5.4 or by a court of competent
          jurisdiction)  that THEC or KeySpan is obligated  to indemnify  THX or
          THEC  fails to notify  THX  within 45 days  after  receipt of a Notice
          Claim  that  it  disputes  the  applicable   Indemnity   Claim,   such
          indemnification shall be paid promptly by wire transfer of immediately
          available funds to an account designated by THX.

               10.5.4 In the event  that the  indemnifying  party  disputes  the
          existence and/or amount of a claim for  indemnification set forth in a
          Notice  of  Claim,  it will be  entitled  to  deliver  a notice to the
          indemnified  party  disputing its validity or the amount  thereof (the
          "Claim Dispute Notice"). The Claim Dispute Notice will be given within
          45 days of receipt  of the Notice of Claim to which the Claim  Dispute
          Notice  relates.   Upon  receiving  such  Claim  Dispute  Notice,  the
          indemnified party shall provide the indemnifying  party with access to
          such  books  and  records  as  may  be  reasonably  requested  by  the
          indemnifying  party for  purposes  of  verifying  such  claim.  Senior
          management of each of the indemnified party and the indemnifying party
          shall in good faith meet promptly after such review so as to come to a
          settlement  of the matter.  In the event a settlement  is not achieved
          within  30 days  after  the  date of the  Claim  Dispute  Notice,  the
          indemnified  party may pursue whatever legal remedies may be available
          under this Agreement.

     Section 10.6 Third Party Claim.

               10.6.1 If an  Indemnity  Claim by THEC or  KeySpan  involves  any
          Action  brought or made by any third  party (a "Third  Party  Claim"),
          then if THX  acknowledges  in writing its obligation to indemnify THEC
          or KeySpan in respect  of such Third  Party  Claim,  THX may elect (by
          written notice to THEC delivered  within thirty (30) days of notice by
          THEC to THX  pursuant to Section  10.5.1) to assume at its expense the
          defense of such Third Party Claim using counsel reasonably  acceptable
          to THEC.  If THX does not so elect to assume such  defense,  then such
          Third  Party Claim shall be defended by THEC or KeySpan in such manner
          as it reasonably deems  appropriate (and the costs,  fees and expenses
          of THEC for such defense shall constitute Damages), including entering
          a reasonable  settlement  thereof in which event the  settlement  plus
          THEC's or KeySpan's  (as  applicable)  costs,  fees and expenses  with
          respect  thereto  shall be the  Damage;  provided  that THEC shall not
          enter into any  settlement of such Third Party Claim without the prior


                                       38


          written  consent  of THX,  which  consent  shall  not be  unreasonably
          withheld,  unless THX and its Affiliates  have no liability  therefor,
          are not required to admit any  liability  and will not be bound by any
          restrictions or limitations on its or their conduct thereafter, and no
          negative  precedent for future claims,  actions or litigation  against
          THX and its Affiliates will be  established,  in which case no consent
          shall be  required.  If the  defense of a Third  Party  Claim has been
          assumed by THX, THX shall cooperate with THEC or KeySpan in connection
          with such  defense  and shall  permit  THEC or KeySpan to  participate
          therein;  provided,  that THX shall  not be liable to THEC or  KeySpan
          under the provisions  hereof for any legal or other expenses  incurred
          by THEC or  KeySpan  (as  applicable)  in  connection  with  THEC's or
          KeySpan's (as applicable)  participation  in the defense of such Third
          Party Claim  after THX has  elected to assume the  defense  thereof so
          long as THX is  diligently  contesting  such Third Party Claim in good
          faith,  unless THEC or KeySpan is advised by outside  counsel  that an
          actual or  potential  conflict  of  interest  exists  between  THEC or
          KeySpan  (as  applicable)  and  THX or that  there  are  different  or
          additional  defenses available to THEC or KeySpan, as the case may be,
          that are not available to THX, in which case THEC may engage  separate
          counsel  (the fees and costs of which shall be borne by THX).  THX may
          not enter into any settlement of a Third Party Claim without the prior
          written consent of THEC or KeySpan (as applicable),  which will not be
          unreasonably  withheld,  unless KeySpan and THEC and their  respective
          Affiliates have no liability  therefor,  are not required to admit any
          liability and will not be bound by any  restrictions or limitations on
          its or their conduct thereafter,  and no negative precedent for future
          claims,  actions  or  litigation  against  KeySpan  and THEC and their
          respective  Affiliates will be  established,  in which case no consent
          shall be required.

               10.6.2 If THX's  Indemnity  Claim  involves a Third Party  Claim,
          then if THEC or KeySpan  acknowledges  in writing  its  obligation  to
          indemnify  THX in respect of such Third Party  Claim,  THEC or KeySpan
          may elect (by written notice to THX delivered  within thirty (30) days
          of notice by THX to THEC pursuant to Section  10.5.1) to assume at its
          expense the defense of such Third Party Claim using counsel reasonably
          acceptable to THX. If THEC or KeySpan does not so elect to assume such
          defense,  then such Third Party Claim shall be defended by THX in such
          manner as it reasonably  deems  appropriate  (and the costs,  fees and
          expenses of THX for such defense shall constitute Damages),  including
          entering a reasonable settlement thereof in which event the settlement
          plus THX's costs,  fees and expenses with respect thereto shall be the
          Damage;  provided that THX shall not enter into any settlement of such
          Third Party Claim  without the prior  written  consent of THEC,  which
          consent shall not be unreasonably  withheld,  unless THEC, KeySpan and
          their  respective  Affiliates  have  no  liability  therefor,  are not
          required  to  admit  any  liability  and  will  not  be  bound  by any
          restrictions or limitations on its or their conduct thereafter, and no
          negative  precedent for future claims,  actions or litigation  against
          THEC, KeySpan and their respective Affiliates will be established,  in
          which case no consent shall be required.  If the Third Party Claim has
          been assumed by THEC or KeySpan, THEC or KeySpan (as applicable) shall
          cooperate  with THX in  connection  with such defense and shall permit
          THX to  participate  therein;  provided,  that  THEC  or  KeySpan  (as
          applicable) shall not be liable to THX under the provisions hereof for
          any legal or other expenses  incurred by THX in connection  with THX's
          participation  in the  defense of such Third Party Claim after THEC or
          KeySpan (as  applicable)  has elected to assume the defense thereof so
          long as THEC or KeySpan (as applicable) is diligently  contesting such


                                       39


          Third  Party  Claim in good  faith,  unless  THX is advised by outside
          counsel  that an actual  or  potential  conflict  of  interest  exists
          between  THX and THEC or  KeySpan  (as  applicable)  or that there are
          different  or  additional  defenses  available  to THX  that  are  not
          available  to THEC or KeySpan (as  applicable),  in which case THX may
          engage separate counsel (the fees and costs of which shall be borne by
          THEC or KeySpan). THEC or KeySpan may not enter into any settlement of
          a Third Party Claim  without the prior written  consent of THX,  which
          will not be unreasonably withheld,  unless THX and its Affiliates have
          no liability  therefor,  are not required to admit any  liability  and
          will not be bound by any  restrictions  or limitations on its or their
          conduct  thereafter,  and no  negative  precedent  for future  claims,
          actions  or  litigation   against  THX  and  its  Affiliates  will  be
          established, in which case no consent shall be required.

     Section 10.7  Exclusivity.  Following  the  Closing,  except in the case of
common law fraud or with  respect to  matters  for which the remedy of  specific
performance,  injunctive  relief or other  non-monetary  equitable  remedies are
available,  the sole and exclusive remedy of the parties with respect to any and
all claims arising from any breach of the  representations  or warranties herein
or in any certificate or other document delivered hereunder or nonperformance of
any covenants and  agreements  herein or in any  certificate  or other  document
delivered  hereunder  shall be pursuant to the  indemnification  provisions  set
forth in this Article X;  provided  that all matters  relating to Taxes shall be
addressed in and governed by the Tax Matters Agreement.

                                   Article XI.
                                  MISCELLANEOUS

     Section  11.1  Notices.  All  notices or other  communications  required or
permitted  hereunder shall be in writing and shall be delivered  personally,  by
facsimile  (with  confirming  copy  sent by one of the  other  delivery  methods
specified  herein),  by overnight  courier or sent by  certified,  registered or
express air mail,  postage prepaid,  and shall be deemed given when so delivered
personally,  or when so received by facsimile or courier,  or, if mailed,  three
calendar days after the date of mailing, as follows:

If to THX:                    The Houston Exploration Company
                              1100 Louisiana, Suite 2000
                              Houston, Texas  77002
                              Facsimile: (713) 830-6885
                              Attention: John H. Karnes

and with a copy to            King & Spalding LLP
(which shall not constitute   1100 Louisiana, Suite 4000
notice to):                   Houston, Texas  77002
                              Facsimile: (713) 751-3290
                              Attention: Christine B. LaFollette

                                       40


If to THEC:                   THEC Holdings Corp.
                              c/o KeySpan Energy Corporation
                              One Metrotech Center
                              Brooklyn, New York  11201-3850
                              Facsimile: (718) 403-3394
                              Attention: Saiyed Zain Mirza

and with a copy to            Simpson Thacher & Bartlett LLP
(which shall not constitute   425 Lexington Avenue
notice to):                   New York, New York 10017
                              Facsimile: (212) 455-2502
                              Attention: William R. Dougherty

If to KeySpan:                KeySpan Corporation
                              One Metrotech Center
                              Brooklyn, New York  11201-3850
                              Facsimile: (718) 403-2161
                              Attention: Steven L. Zelkowitz

and with a copy to            KeySpan Corporation
(which shall not constitute   Office of the General Counsel
notice to):                   One Metrotech Center
                              Brooklyn, New York  11201-3850
                              Facsimile: (718) 403-2809
                              Attention: John J. Bishar, Jr.

and with a copy to            Simpson Thacher & Bartlett LLP
(which shall not constitute   425 Lexington Avenue
notice to):                   New York, New York 10017
                              Facsimile: (212) 455-2502
                              Attention: William R. Dougherty

or to such other  address and with such other  copies as any party  hereto shall
notify the other parties hereto (as provided above) from time to time.

     Section 11.2 Governing Law; Consent to  Jurisdiction.  This Agreement shall
be governed by, and construed in accordance with, the internal Laws of the State
of Delaware,  without reference to the choice of law principles thereof. Each of
the parties  hereto  irrevocably  submits to the exclusive  jurisdiction  of the
courts of the State of Delaware  and the United  States  District  Court for any
district within such state for the purpose of any Action or judgment relating to
or arising out of this Agreement or any of the transactions  contemplated hereby
and to the laying of venue in such court.  Service of process in connection with
any such  Action may be served on each party  hereto by the same  methods as are
specified  for the giving of notices  under this  Agreement.  Each party  hereto
irrevocably  and  unconditionally  waives  and  agrees not to plead or claim any
objection  to the laying of venue of any such Action  brought in such courts and
irrevocably and unconditionally waives any claim that any such Action brought in
any such court has been brought in an inconvenient forum.

                                       41


     Section  11.3  Waiver of Jury Trial.  Each party  hereto  acknowledges  and
agrees  that any  controversy  which may arise  under  this  Agreement,  the Tax
Matters  Agreement  or any  other  Ancillary  Agreement  is  likely  to  involve
complicated  and  difficult  issues  and,  therefore,  each  such  party  hereby
irrevocably  and  unconditionally  waives to the  fullest  extent  permitted  by
applicable  Law,  any right such party may have to a trial by jury in respect to
any Action directly or indirectly arising out of, under or in connection with or
relating to this  Agreement,  the Tax Matters  Agreement or any other  Ancillary
Agreement or the  transactions  contemplated by this Agreement,  the Tax Matters
Agreement or any other  Ancillary  Agreement.  Each party hereto  certifies  and
acknowledges  that (a) no  representative,  agent or attorney of any other party
hereto has represented, expressly or otherwise, that such other party would not,
in the event of such Action, seek to enforce the foregoing waiver, (b) each such
party  understands and has considered the implications of this waiver,  (c) each
such  party  makes  this  waiver  voluntarily  and (d) each such  party has been
induced to enter into this Agreement by, among other things,  the mutual waivers
and certifications in this Section 11.3.

     Section 11.4  Assignment;  Successors  and Assigns;  No Third Party Rights.
This  Agreement  and the Ancillary  Agreements  may not be assigned by any party
hereto without the prior written  consent of the other parties  hereto,  and any
attempted  assignment  shall be null and void.  This Agreement and the Ancillary
Agreements  shall be binding upon and inure solely to the benefit of the parties
hereto and their respective successors and permitted assigns. Except as provided
in Sections 10.2 or 10.3,  this  Agreement  shall be for the sole benefit of the
parties hereto, and their respective successors and permitted assigns and is not
intended (expressly or otherwise),  nor shall be construed,  to give any Person,
other than the parties  hereto and their  respective  successors  and  permitted
assigns  any legal or  equitable  right,  benefit,  remedy  or claim  hereunder.
Nothing  in this  Agreement  shall  prevent  any  party and its  successors  and
permitted  assigns  from   consolidating  with  or  merging  with  or  into,  or
transferring,   in  one  transaction  or  a  series  of  related   transactions,
substantially  all of its assets to, any Person or Persons;  provided,  however,
that the  purchaser  of  substantially  all of the  assets  of the  party or its
successor  or  permitted  assign shall agree with the other party to be bound by
all of the transferring party's obligations  hereunder;  provided,  further that
THEC may assign its rights  under  Section 6.9 to any  Affiliate  of KeySpan who
holds THX Shares at such time.

     Section 11.5 Counterparts.  This Agreement may be executed in counterparts,
each of which  shall be  deemed an  original,  and all of which  together  shall
constitute  one and the same  instrument.  This  Agreement  may be  executed  by
facsimile signature.

     Section  11.6 Titles and  Headings.  The  headings and table of contents in
this Agreement are for reference  purposes only, and shall not in any way affect
the meaning or interpretation of this Agreement.

     Section 11.7 Entire Agreement.  This Agreement (including the Schedules and
Exhibits attached hereto or delivered in connection  herewith) and the Ancillary
Agreements constitute the entire agreement among the parties hereto with respect
to the matters covered hereby and thereby,  and supersede all previous  written,
oral or implied agreements,  representations and understandings  among them with
respect to such matters.

     Section 11.8 Amendment and Modification.  This Agreement may not be amended


                                       42


or modified  except by an  instrument  in writing  signed by each of the parties
hereto.

     Section 11.9 Publicity;  Public  Announcements.  THX, Subsidiary,  THEC and
KeySpan  shall  consult  with each other before  issuing,  and give each other a
reasonable opportunity to review and comment upon the initial press release with
respect to the transactions contemplated hereby.

     Section 11.10 Waiver.  Any of the terms or conditions of this Agreement may
be waived at any time by the party or parties  hereto  entitled  to the  benefit
thereof, but only by a writing signed by the party or parties waiving such terms
or  conditions.  No such  waiver  shall be  operative  as a waiver  of any other
subsequent requirement of this Agreement. The failure of any party to assert any
of its rights under this Agreement or otherwise shall not constitute a waiver of
such rights.

     Section  11.11  Severability.   If  any  term,   provisions,   covenant  or
restriction  of this Agreement is held by a court of competent  jurisdiction  or
other  authority  to be invalid,  void or  unenforceable,  the  remainder of the
terms, provisions,  covenants and restrictions of this Agreement shall remain in
full force and effect and shall in no way be affected,  impaired or  invalidated
so long as the  economic or legal  substance  of the  transactions  contemplated
hereby is not affected in any manner materially  adverse to any party. Upon such
determination,  the  parties  shall  negotiate  in good  faith  to  modify  this
Agreement  so as to effect  the  original  intent of the  parties  as closely as
possible in an  acceptable  manner in order that the  transactions  contemplated
hereby be consummated as originally contemplated to the fullest extent possible.

     Section 11.12 No Strict Construction.  THEC, KeySpan, Seneca-Upshur and THX
each  acknowledge  that this Agreement has been prepared  jointly by the parties
hereto and shall not be strictly construed against any party hereto.

     Section 11.13 Knowledge.  To the extent that any  representation is made to
"THX's  knowledge" (or similar words),  such knowledge shall refer to the actual
knowledge,  after due inquiry,  of the  individuals  listed in Section  11.13 of
THX's  Disclosure  Schedule.  To the extent that any  representation  is made to
"THEC's knowledge" or "KeySpan's  knowledge" (or similar words),  such knowledge
shall  refer to the actual  knowledge,  after due  inquiry,  of the  individuals
listed in Section 11.13 of THEC's Disclosure Schedule.

     Section  11.14  Affiliate  Status.  To the  extent  that a party  hereto is
required  hereunder to take certain  action with respect to entities  designated
herein as such party's Affiliates,  such obligation shall apply to such entities
only during such period of time that such entities are Affiliates of such party.

     Section 11.15 No Third Party  Beneficiaries This Agreement shall be binding
upon and inure solely to the benefit of the parties  hereto and their  permitted
assigns and nothing herein,  express or implied,  is intended to or shall confer
upon any other  Person any legal or  equitable  right,  benefit or remedy of any
nature whatsoever,  including any rights of employment for any specified period,
under or by reason of this Agreement.

     Section 11.16  Specific  Performance.  The parties agree that if any of the
provisions  of this  Agreement  were not  performed  in  accordance  with  their


                                       43


specific terms or were otherwise  breached,  irreparable  damage would occur, no
adequate  remedy at law would exist and damages would be difficult to determine,
and that the parties  shall be entitled  to  specific  performance  of the terms
hereof or injunctive relief, in addition to any other remedy at law or equity.

     Section  11.17  Expenses.  Each  party  shall  be  responsible  for its own
expenses  incurred in connection with this Agreement,  the Ancillary  Agreements
and the transactions contemplated hereby and thereby.























                                       44




     IN WITNESS  WHEREOF,  the parties  hereto have caused this  Agreement to be
duly executed as of the day and year first above written.



                                     THE HOUSTON EXPLORATION COMPANY


                                     By: /s/ John H. Karnes
                                         --------------------------------------
                                         Name:     John H. Karnes
                                         Title:    Senior Vice President and
                                                   Chief Financial Officer



                                     SENECA-UPSHUR PETROLEUM, INC.


                                     By: /s/ James F. Westmoreland
                                         --------------------------------------
                                         Name:     James F. Westmoreland
                                         Title:    Vice President



                                     THEC HOLDINGS CORP.


                                     By: /s/ Michael J. Nilsen
                                         --------------------------------------
                                         Name:     Michael J. Nilsen
                                         Title:    Vice President, Treasurer
                                                   and Comptoller



                                     KEYSPAN CORPORATION


                                     By: /s/ Michael J. Taunton
                                         --------------------------------------
                                         Name:     Michael J. Taunton
                                         Title:    Senior Vice President
                                                   and Treasurer










                                                                     Exhibit 11

               AMENDED AND RESTATED REGISTRATION RIGHTS AGREEMENT

     This Amended and Restated  Registration Rights Agreement,  dated as of June
2, 2004 (this "Agreement"), is entered into by and among The Houston Exploration
Company,  a Delaware  corporation  (the  "Company"),  and THEC Holdings Corp., a
Delaware corporation ("THEC Holdings").

                               W I T N E S S E T H

     WHEREAS,  the  Company,  Seneca-Upshur  Petroleum,  Inc.  ("Seneca"),  THEC
Holdings and KeySpan  Corporation  have entered  into a  Distribution  Agreement
dated as of June 2, 2004 where THEC  Holdings  will  exchange  up to  10,800,000
shares of Common  Stock for all of the  outstanding  common stock of Seneca (the
"Distribution");

     WHEREAS,  the Company  and THEC  Holdings  are parties to the  Registration
Rights Agreement,  dated as of July 2, 1996 (the "Existing  Registration  Rights
Agreement"); and

     WHEREAS,  in connection  with the  Distribution  the parties have agreed to
amend and restate the Existing  Registration Rights Agreement in accordance with
the terms and conditions hereinafter set forth.

     NOW,  THEREFORE,  the parties  hereto  agree that as of the date hereof the
Existing  Registration  Rights  Agreement is hereby  amended and restated in its
entirety as follows:

1.   Certain Definitions.  As used in this Agreement,  the following terms shall
     have the meanings set forth below:

     (a)  "Commercially  Reasonable  Efforts",  when  used  with  respect  to an
          obligation  to be  performed  or  term  or  provision  to be  observed
          hereunder, means such efforts as a prudent person seeking the benefits
          of such  performance  or action would make,  use, apply or exercise to
          preserve,  protect or advance its rights or  interests,  provided that
          such efforts do not require such person to incur a material  financial
          cost or a substantial  risk of material  liability unless such cost or
          liability  (i)  would   customarily  be  incurred  in  the  course  of
          performance  or  observance  of  the  relevant  obligation,  term,  or
          provision,  (ii) is  caused by or  results  from the  wrongful  act or
          negligence of the person whose  performance  or observance is required
          hereunder  or (iii) is not  excessive or  unreasonable  in view of the
          rights or interests  to be  preserved,  protected  or  advanced.  Such
          efforts may include,  without limitation,  (A) the expenditure of such
          funds and retention by such person of such  accountants,  attorneys or
          other experts or advisors as may be necessary or appropriate to effect
          the  relevant  action,  (B) the  undertaking  of any special  audit or
          internal  investigation that may be necessary or appropriate to effect
          the  relevant  action  and  (C)  the   commencement,   termination  or
          settlement of any action, suit or proceeding  involving such person to
          the extent necessary or appropriate to effect the relevant action.

     (b)  "Commission" means the Securities and Exchange Commission or any other
          federal agency at the time administering the Securities Act.

     (c)  "Company"  has the meaning set forth in the initial  paragraph of this
          Agreement

     (d)  "Common  Stock" means the shares of Common Stock,  par value $0.01 per
          share, of the Company.






     (e)  "Exchange Act" means the Securities  Exchange Act of 1934, as amended,
          or any similar successor federal statute and the rules and regulations
          thereunder, all as the same shall be in effect from time to time.

     (f)  "Holder" means THEC Holdings and any holder of Registrable  Securities
          to whom the registration  rights conferred by this Agreement have been
          transferred in compliance with Section 10 hereof.

     (g)  The  terms  "register,"  "registered"  and  "registration"  refer to a
          registration effected by preparing and filing a registration statement
          in  compliance  with  the  Securities  Act and  applicable  rules  and
          regulations  thereunder,  and  the  declaration  or  ordering  of  the
          effectiveness of such registration statement.

     (h)  "Registrable  Securities" means (i) any shares of Common Stock held by
          THEC Holdings, and (ii) any Common Stock issued as a dividend or other
          distribution  with respect to or in exchange for or in  replacement of
          such shares, provided,  however, that Registrable Securities shall not
          include  any  shares  of  Common  Stock  which  have  previously  been
          registered and sold under the Securities  Act, which have been sold or
          otherwise  transferred  under  Rule 144 or which  may be sold  without
          restriction pursuant to Rule 144(k).

     (i)  "Registration  Expenses" means all expenses  incurred in effecting any
          registration pursuant to this Agreement (excluding,  for the avoidance
          of  doubt,  the  Shelf  Registration  Statement),  including,  without
          limitation, all registration, qualification, and filing fees, printing
          expenses,  escrow  fees,  fees and  disbursements  of counsel  for the
          Company,  blue sky fees and  expenses,  and expenses of any regular or
          special audits incident to or required by any such  registration,  but
          shall  not  include  Selling  Expenses  (and  shall  not  include  the
          compensation of regular employees of the Company,  which shall be paid
          in any event by the Company).

     (j)  "Rule 144" means Rule 144 as promulgated  by the Commission  under the
          Securities  Act, as such Rule may be amended from time to time, or any
          similar successor rule that may be promulgated by the Commission.

     (k)  "Rule 145" means Rule 145 as promulgated  by the Commission  under the
          Securities  Act, as such Rule may be amended from time to time, or any
          similar successor rule that may be promulgated by the Commission.

     (l)  "Securities Act" means the Securities Act of 1933, as amended,  or any
          similar  successor  federal  statute  and the  rules  and  regulations
          thereunder, all as the same shall be in effect from time to time.

     (m)  "Selling  Expenses"  means  all  underwriting  discounts  and  selling
          commissions  applicable to the sale of Registrable  Securities and all
          fees and disbursements of counsel for any Holder.

2.   Shelf  Registration.  The Company  hereby  acknowledges  that the Company's
     Registration  Statement  on Form  S-3  (No.  333-113659),  filed  with  the
     Commission  on March 16, 2004 for an  offering  to be made on a  continuous
     basis  pursuant  to Rule  415  under  the  Securities  Act  (including  any
     amendments and supplements or  replacements  as provided below,  the "Shelf
     Registration  Statement")  covers all of the  Registrable  Securities.  The
     Company  agrees to use  Commercially  Reasonable  Efforts to keep the Shelf
     Registration  Statement continuously effective until the earlier of (x) the
     date which is 18 months from the date hereof  (provided  that such 18-month
     period shall be extended  for the  duration of any period  during which the




                                       2



     Holder's  right  to  sell  Registrable   Securities   thereunder  has  been
     suspended) or (y) such date as all shares of Registrable Securities held or
     entitled to be held upon conversion by Holder may be immediately sold under
     Rule 144 during any 90-day period (such period, the "Effective Period"). If
     the Shelf  Registration  Statement ceases to be effective for any reason at
     any time during the Effective Period (other than because of the sale of all
     of  the   securities   registered   thereunder),   the  Company  shall  use
     Commercially  Reasonable  Efforts to obtain the  prompt  withdrawal  of any
     order  suspending  the  effectiveness   thereof  or  shall  file  with  the
     Commission  a new  registration  statement  for an offering to be made on a
     continuous basis pursuant to Rule 415 under the Securities Act covering all
     of the shares of Registrable  Securities then outstanding for the remainder
     of the  Effective  Period.  Holders  may only sell  Registrable  Securities
     pursuant to the Shelf Registration  Statement in transactions involving not
     less than 500,000  shares of Common Stock  (subject to adjustment for stock
     dividends, stock splits and the like) per transaction.

3.       Demand Registration.

          3.1  Request for  Registration.  (a) At any time and from time to time
               one or more  Holders  will have the  right by a  written  request
               delivered  to the Company,  to require that the Company  register
               all or part of the Registrable  Securities,  representing no less
               than 10% of the Company's then outstanding shares of Common Stock
               (a "Demand Registration"); provided that effective on the date of
               this  Agreement  and subject to the  conditions  set forth herein
               THEC Holdings (and any Holder of  Registrable  Securities to whom
               registration   rights  conferred  by  this  Agreement  have  been
               transferred  in  compliance  with Section 10 hereof) may not make
               more than two  Demand  Registrations  in total.  Upon  receipt of
               notice pursuant to this Section 3.1(a), the Company will:

               (i)  promptly give written notice of the proposed registration to
                    all other Holders;

                    and

               (ii) as soon as practicable,  use Commercially Reasonable Efforts
                    to  effect  such  Demand  Registration  (including,  without
                    limitation,   filing  a   registration   statement  and  any
                    appropriate  pre-effective  or  post-effective   amendments,
                    appropriate  qualifications  under  applicable  blue  sky or
                    other state securities laws, and appropriate compliance with
                    the  Securities  Act) so as to permit or facilitate the sale
                    and  distribution  of all or such portion of the Registrable
                    Securities as are  specified in such request,  together with
                    all or such  portion of the  Registrable  Securities  of any
                    Holder or Holders  joining in such request as are  specified
                    in a written request  received by the Company within 20 days
                    after such written notice from the Company is effective.

     Each request for a Demand  Registration  under this Section 3 shall specify
the amount of Registrable Securities proposed to be registered.

     (b)  The Company shall not be obligated to effect, or to take any action to
          effect, any such Demand Registration pursuant to this Section 3:

          (i)  in any  particular  jurisdiction  in which the  Company  would be
               required  to  execute a general  consent to service of process in
               effecting such registration, qualification, or compliance, unless
               the  Company is already  subject to service in such  jurisdiction
               and except as may be required by the Securities Act;

          (ii) prior to the  expiration  of a period  of six  months  after  the
               Company has  initiated any Demand  Registration  pursuant to this
               Section  3.1,  provided  that  a  Demand  Registration  initiated
                                       3


               pursuant to this  Section 3.1 and  subsequently  withdrawn by the
               Holders  registering  shares  therein  shall not be  counted as a
               requested Demand Registration pursuant to this clause (ii) if (X)
               such  withdrawal  is  based  upon  material  adverse  information
               relating to the Company that is not known by or  available  (upon
               request from the Company or otherwise) to the Holders  initiating
               the  Demand  Registration  at  the  time  of  their  request  for
               registration pursuant to this Section 3.1 or (Y) the Holders bear
               the Registration Expenses for such registration;

          (iii)during  the  period  starting  with the date 60 days prior to the
               Company's  good  faith  estimate  of the date of filing  of,  and
               ending  on a date  180  days  after  the  effective  date  of,  a
               Company-initiated  registration,  provided  that the  Company  is
               actively  employing  in good  faith all  Commercially  Reasonable
               Efforts to cause such registration statement to become effective;

          (iv) if the Holders  initiating a Demand  Registration  do not request
               that  such  offering  be  firmly   underwritten  by  underwriters
               selected by a majority in  interest of the Holders  initiating  a
               Demand Registration (subject to the consent of the Company, which
               consent will not be unreasonably withheld);

          (v)  if the  Company and the  initiating  Holders are unable to obtain
               the commitment of the underwriters described in clause (iv) above
               to firmly underwrite the offer; or

          (vi) if,  within 14 days  after its  receipt  of a written  request to
               effect  such  Demand  Registration,  the  Company  causes  to  be
               delivered to the Holders  initiating the Demand  Registration  an
               opinion  of  King &  Spalding  LLP or  other  counsel  reasonably
               acceptable  to the  initiating  Holders  to the  effect  that the
               proposed disposition of Registrable  Securities by the initiating
               Holders will not require  registration or qualification under the
               Securities Act, it being specifically  understood and agreed that
               the initiating  Holders will promptly  furnish to the Company and
               such counsel all information such counsel may reasonably  request
               in order to enable such counsel to determine  whether it would be
               able to render such opinion.

     3.2  Right to Defer  Registration.  Subject  to the  provisions  of Section
          3.1(b), the Company shall use Commercially  Reasonable Efforts to file
          a  registration  statement  covering  the  Registrable  Securities  so
          requested to be registered as soon as practicable after receipt of the
          request or requests of the Holders initiating the Demand Registration;
          provided, however, that if (i) in the good faith judgment of the Board
          of  Directors of the  Company,  and in view of a material  undisclosed
          pending  transaction  or event  that the  Board  of  Directors  of the
          Company  determines is reasonably likely to occur in the near term and
          the disclosure of which at such time the Board of Directors of Company
          determines would not be in the best interests of the Company,  and the
          Board of Directors of the Company concludes,  as a result,  that it is
          in the best  interests  of the  Company  to defer  the  filing of such
          registration  statement  at such  time,  and  (ii) the  Company  shall
          furnish to such Holders a certificate  signed by an executive  officer
          of the Company stating that in the good faith judgment of the Board of
          Directors  of the  Company,  and in  view  of a  material  undisclosed
          pending  transaction  or event  that the  Board  of  Directors  of the
          Company  determines is reasonably likely to occur in the near term and
          the  disclosure  of  which  at  such  time  would  not be in the  best
          interests of the Company, it would not be in the best interests of the
          Company for such  registration  statement to be filed at such time and
          that it is,  therefore,  consistent  with  the best  interests  of the
          Company to defer the filing of such registration  statement,  then the
          Company  shall  have the right to defer  such  filing  for the  period
          during which such situation exists and such disclosure would have such
          effect,  provided  that  (except as  provided  in Section  3.1(b)(iii)
          above) the  Company may not defer the filing for a period of more than
          180 days after  receipt of the request of the Holders  initiating  the
          Demand Registration, and, provided further, that the Company shall not
          defer its obligation in this manner more than once in any twelve-month
          period.






                                       4


     3.3  Underwriting.  (a) The right of any Holder to registration pursuant to
          Section 3 shall be  conditioned  upon such Holder's  participation  in
          such  underwriting  and the  inclusion  of such  Holder's  Registrable
          Securities in the  underwriting  to the extent  provided  herein.  All
          Holders   proposing  to  distribute  their  securities   through  such
          underwriting   (together   with  the  Company  and  other  holders  of
          securities of the Company exercising  registration rights with respect
          to such  registration)  shall enter into an underwriting  agreement in
          customary  form  with  the   representative   of  the  underwriter  or
          underwriters  selected  by a  majority  in  interest  of  the  Holders
          initiating  the Demand  Registration,  subject  to the  consent of the
          Company, which consent shall not be unreasonably withheld.

          (b)  Notwithstanding  any other  provision  of this  Section 3, if the
               representative of the underwriters advises the Holders initiating
               the Demand Registration in writing that marketing factors require
               a  limitation  on the  number of shares to be  underwritten,  the
               number  of  shares  to  be  included  in  the   underwriting   or
               registration  shall  be  allocated  as set  forth in  Section  11
               hereof.  If  a  person  who  has  requested   inclusion  in  such
               registration as provided above does not agree to the terms of any
               such  underwriting,  such person  shall be excluded  therefrom by
               written notice from the Company,  the  underwriter or the Holders
               initiating the Demand Registration. Any Registrable Securities or
               other  securities  excluded or withdrawn  from such  underwriting
               shall also be withdrawn from such registration.  If shares are so
               withdrawn from the registration and if the number of shares to be
               included in such registration was previously  reduced as a result
               of  marketing  factors  pursuant to this  Section  3.3,  then the
               Company  shall offer to all Holders who have  retained  rights to
               include  securities  in the  registration  the  right to  include
               additional  securities in the registration in an aggregate amount
               equal to the number of shares so  withdrawn,  with such shares to
               be allocated among such Holders requesting  additional  inclusion
               in accordance with Section 11 hereof.

4.       Piggyback Registration.

          4.1  Notice  of  Registration.  If  the  Company  shall  determine  to
               register any of its securities  either for its own account or the
               account  of  a  security  holder  or  holders   exercising  their
               respective  demand  registration  rights  (other than pursuant to
               Section 3 hereof),  other than a registration  relating solely to
               employee benefit plans, a registration  relating solely to a Rule
               145 transaction,  or a registration on any registration form that
               does not permit secondary sales, the Company will:

               (a)  promptly give to each Holder written notice thereof; and

               (b)  use  Commercially  Reasonable  Efforts  to  include  in such
                    registration (and any related  qualification  under blue sky
                    laws or other  compliance),  except as set forth in  Section
                    4.2 below, and in any underwriting involved therein, all the
                    Registrable  Securities  specified  in a written  request or
                    requests,  made  by any  Holder  within  20 days  after  the
                    written  notice  from the  Company  described  in clause (a)
                    above is given.  Such  written  request may specify all or a
                    part of a Holder's Registrable Securities.

          4.2  Right to Terminate Registration. The Company shall have the right
               to terminate or withdraw any  registration  initiated by it under
               this Section 4 prior to the  effectiveness  of such  registration
               whether  or not any Holder  has  elected  to include  Registrable
               Securities in such registration.

          4.3 Underwriting.

               (a)  If the registration of which the Company gives notice is for
                    a registered public offering involving an underwriting,  the
                    Company shall so advise the Holders as a part of the written
                    notice given  pursuant to Section 4.1 above.  In such event,
                    the right of any  Holder to  registration  pursuant  to this




                                       5



                    Section  4  shall  be   conditioned   upon   such   Holder's
                    participation in such underwriting and the inclusion of such
                    Holder's  Registrable  Securities in the underwriting to the
                    extent provided herein.  All Holders proposing to distribute
                    their securities  through such  underwriting  (together with
                    the  Company  and such other  holders of  securities  of the
                    Company exercising  registration rights with respect to such
                    registration) shall enter into an underwriting  agreement in
                    customary form with the representative of the underwriter or
                    underwriters selected by the Company or the security holders
                    initiating such registration, as the case may be.

               (b)  Notwithstanding  any other  provision  of this Section 4, if
                    the  representative of the underwriters  advises the Company
                    in writing that  marketing  factors  require a limitation on
                    the number of shares to be underwritten,  the representative
                    may (subject to the limitations set forth below) exclude all
                    Registrable   Securities   from,  or  limit  the  number  of
                    Registrable  Securities to be included in, the  registration
                    and underwriting. The Company shall so advise all holders of
                    securities  requesting  registration,   and  the  amount  of
                    securities   that  are   entitled  to  be  included  in  the
                    registration  and  underwriting  shall be allocated first to
                    the  Company for  securities  being sold for its own account
                    and  thereafter  as set forth in Section  11 hereof.  If any
                    person does not agree to the terms of any such underwriting,
                    such person shall be excluded  therefrom  by written  notice
                    from  the  Company  or  the  underwriter.   Any  Registrable
                    Securities or other  securities  excluded or withdrawn  from
                    such underwriting shall be withdrawn from such registration.

5.   Expenses of Registration.  All Registration  Expenses in any  registration,
     qualification  or  compliance  pursuant  to Section 3 shall be borne by the
     holders of the securities so registered pro rata on the basis of the number
     of shares of securities so  registered  on their behalf.  All  Registration
     Expenses  in any  registration,  qualification  or  compliance  pursuant to
     Section 4 shall be borne by the Company.  All Selling Expenses  relating to
     securities so registered  shall be borne by the holders of such  securities
     pro rata on the basis of the number of shares of  securities  so registered
     on their behalf.

6.   Registration  Procedures.  In the case of the Shelf  Registration  and each
     registration  effected  by the  Company  pursuant  to this  Agreement,  the
     Company will keep each Holder  advised in writing as to the  initiation  of
     each registration and as to the completion thereof. At its expense (except,
     as otherwise provided herein), the Company will use Commercially Reasonable
     Efforts to:

     (a)  except in the case with the Shelf Registration Statement (the duration
          of  effectiveness  of which shall be governed by Section 2), keep such
          registration effective for a period of 120 days or until the Holder or
          Holders have completed the distribution  described in the registration
          statement relating thereto, whichever first occurs; provided, however,
          that such 120-day  period shall be extended for a period of time equal
          to the period after the  effectiveness of such  registration  that the
          Holder   refrains  from  selling  any  securities   included  in  such
          registration  at the  request of an  underwriter  of Common  Stock (or
          other securities) of the Company;

     (b)  prepare and file with the Commission  such  amendments and supplements
          to such  registration  statement and the prospectus used in connection
          with such  registration  statement  as may be necessary to comply with
          the provisions of the  Securities Act with respect to the  disposition
          of all securities covered by such registration statement;

     (c)  furnish  such  number of  prospectuses  and other  documents  incident
          thereto,  including any amendment of or supplement to the  prospectus,
          as a Holder from time to time may reasonably request;

     (d)  notify  each  seller  of  Registrable   Securities   covered  by  such
          registration  statement at any time when a prospectus relating thereto
          is required to be delivered  under the Securities Act of the happening
          of any  event as a result  of which the  prospectus  included  in such





                                       6


          registration   statement,  as  then  in  effect,  includes  an  untrue
          statement  of a  material  fact or  omits  to  state a  material  fact
          required  to be stated  therein or  necessary  to make the  statements
          therein,  in  the  light  of  the  circumstances  then  existing,  not
          misleading, and at the request of any such seller, prepare and furnish
          to such seller a reasonable  number of copies of a supplement to or an
          amendment  of  such  prospectus  as  may  be  necessary  so  that,  as
          thereafter delivered to the purchasers of such shares, such prospectus
          shall not include an untrue  statement  of a material  fact or omit to
          state a material  fact  required to be stated  therein or necessary to
          make the statements  therein,  in the light of the circumstances  then
          existing, not misleading;

     (e)  cause all such Registrable Securities registered pursuant hereunder to
          be listed on each  securities  exchange  on which  similar  securities
          issued by the Company are then listed;

     (f)  provide a transfer agent and registrar for all Registrable  Securities
          registered pursuant to such registration  statement and a CUSIP number
          for all such Registrable  Securities,  in each case not later than the
          effective date of such registration;

     (g)  comply with all applicable  rules and  regulations of the  Commission,
          and make  available to its  security  holders,  as soon as  reasonably
          practicable,  an earnings  statement  covering  the period of at least
          twelve months,  but not more than eighteen months,  beginning with the
          first month after the effective  date of the  Registration  Statement,
          which earnings statement shall satisfy the provisions of Section 11(a)
          of the Securities Act; and

     (h)  in connection  with any  underwritten  offering  pursuant to the Shelf
          Registration  Statement or a registration  statement filed pursuant to
          Section 3 hereof, (i) make available for reasonable  inspection during
          normal  business  hours by a  representative  of the  Holders  holding
          Registrable  Securities  being sold, any underwriter  participating in
          any  disposition  of  Registrable  Securities,  and  any  attorney  or
          accountant  retained  by such  selling  Holders  or  underwriter,  all
          relevant  financial  information  and records and pertinent  corporate
          documents  of  the  Company  in  connection  with  such   registration
          statement,  and cause the  officers,  directors  and  employees of the
          Company to supply all  information  reasonably  requested  by any such
          representative, underwriter, attorney or accountant in connection with
          such  registration  statement  and (ii) cause  appropriate  members of
          management,   including,   without  limitation,  the  Company's  Chief
          Executive Officer,  to cooperate and participate on a reasonable basis
          in the underwriters' "road show" conferences related to such offering,
          provided  that,  (x) any  records,  information  or document  that are
          designated by the Company as confidential  shall be kept  confidential
          by such person  unless  disclosure  of such  records,  information  or
          documents is required by court or  administrative  order,  and (y) the
          Holders  shall  reimburse  the Company for their  proportionate  share
          (based on the  number of shares  of Common  Stock  being  sold in such
          transaction)  of  the  Company's  reasonable   out-of-pocket  expenses
          incurred in  connection  with the  actions  referred to in this clause
          (h).

In connection with any underwritten  offering pursuant to the Shelf Registration
Statement or a registration  statement  filed pursuant to Section 3 hereof,  the
Company will enter into an underwriting agreement reasonably necessary to effect
the  offer  and sale of  Common  Stock,  provided  such  underwriting  agreement
contains customary underwriting provisions.

7.       Indemnification.

          (a)  The Company will  indemnify  each Holder,  each of its  officers,
               directors and partners,  legal counsel,  and accountants and each
               person  controlling  such Holder within the meaning of Section 15
               of the Securities  Act, if Registrable  Securities of such Holder
               are   included   in  the   securities   with   respect  to  which
               registration,  qualification,  or  compliance  has been  effected





                                       7


               pursuant  to this  Agreement  or  under  the  Shelf  Registration
               Statement,  and each  underwriter,  if any,  and each  person who
               controls  within the meaning of Section 15 of the  Securities Act
               any underwriter,  against all expenses,  claims, losses, damages,
               and  liabilities  (or actions,  proceedings,  or  settlements  in
               respect  thereof) arising out of or based on any untrue statement
               (or alleged untrue statement) of a material fact contained in any
               prospectus,  offering circular,  the Shelf Registration Statement
               or other document (including any related registration  statement,
               notification,  or the like)  incident  to any such  registration,
               qualification,  or  compliance,  or  based  on any  omission  (or
               alleged omission) to state therein a material fact required to be
               stated  therein or necessary to make the  statements  therein not
               misleading, or any violation by the Company of the Securities Act
               or any rule or  regulation  thereunder  applicable to the Company
               and  relating  to action or  inaction  required by the Company in
               connection  with  any  such   registration,   qualification,   or
               compliance,  and will  reimburse  each such  Holder,  each of its
               officers, directors, partners, legal counsel, and accountants and
               each person controlling such Holder,  each such underwriter,  and
               each person who controls any such underwriter,  for any legal and
               any  other  expenses   reasonably  incurred  in  connection  with
               investigating  and  defending or settling  any such claim,  loss,
               damage,  liability, or action, provided that the Company will not
               be  liable in any such case to the  extent  that any such  claim,
               loss, damage,  liability, or expense arises out of or is based on
               any untrue  statement or omission based upon written  information
               furnished to the Company by such Holder or underwriter and stated
               to be  specifically  for  use  therein.  It is  agreed  that  the
               indemnity  agreement  contained  in this  Section  7(a) shall not
               apply to amounts  paid in  settlement  of any such  loss,  claim,
               damage,  liability,  or action  if such  settlement  is  effected
               without the consent of the  Company  (which  consent has not been
               unreasonably withheld).

          (b)  Each  Holder (an  "Indemnifying  Holder")  will,  if  Registrable
               Securities  held by the  Indemnifying  Holder are included in the
               securities  as to  which  such  registration,  qualification,  or
               compliance is being effected,  indemnify the Company, each of its
               directors, officers, partners, legal counsel, and accountants and
               each underwriter,  if any, of the Company's securities covered by
               such a  registration  statement,  each  person who  controls  the
               Company or such  underwriter  within the meaning of Section 15 of
               the  Securities  Act,  each  other such  Holder (an  "Indemnified
               Holder"),  and each of their officers,  directors,  and partners,
               and each person controlling such Indemnified Holder,  against all
               claims,  losses,  damages and  liabilities (or actions in respect
               thereof)  arising  out of or based on any  untrue  statement  (or
               alleged  untrue  statement) of a material  fact  contained in any
               such registration  statement,  prospectus,  offering circular, or
               other  document,  or any omission (or alleged  omission) to state
               therein  a  material  fact  required  to  be  stated  therein  or
               necessary to make the statements therein not misleading, and will
               reimburse the Company and such  Indemnified  Holders,  directors,
               officers,  partners,  legal counsel,  and  accountants,  persons,
               underwriters,  or  control  persons  for any  legal or any  other
               expenses  reasonably incurred in connection with investigating or
               defending any such claim, loss, damage,  liability, or action, in
               each case to the extent, but only to the extent, that such untrue
               statement (or alleged  untrue  statement) or omission (or alleged
               omission)  is made in such  registration  statement,  prospectus,
               offering  circular,  or other  document in  reliance  upon and in
               conformity with written  information  furnished to the Company by
               the  Indemnifying  Holder and stated to be  specifically  for use
               therein;   provided,   however,   that  the  obligations  of  the
               Indemnifying  Holder hereunder shall not apply to amounts paid in
               settlement of any such claims,  losses,  damages,  or liabilities
               (or actions in respect  thereof) if such  settlement  is effected
               without the consent of such Holder  (which  consent  shall not be
               unreasonably  withheld);  and provided further that the liability
               of an  Indemnifying  Holder  pursuant  to  this  Section  7(b) in
               connection  with a  registration  shall  be  limited  to the  net
               proceeds  from the  sale of the  Registrable  Securities  of such
               Indemnifying Holder pursuant to such registration.

          (c)  Each party entitled to indemnification  under this Section 7 (the
               "Indemnified  Party") shall give notice to the party  required to
               provide indemnification (the "Indemnifying Party") promptly after
               such  Indemnified  Party has actual  knowledge of any claim as to
               which  indemnity  may be sought,  and,  except as provided in the
               following sentence, shall permit the Indemnifying Party to assume




                                       8



               the defense of such claim or any litigation  resulting therefrom;
               provided  that  counsel  for the  Indemnifying  Party,  who shall
               conduct  the  defense of such claim or any  litigation  resulting
               therefrom,  shall be approved  by the  Indemnified  Party  (whose
               approval shall not  unreasonably be withheld);  provided  further
               that the Indemnified Party may participate in such defense at its
               own  expense;  and  provided  further  that  the  failure  of any
               Indemnified  Party to give  notice as provided  herein  shall not
               relieve  the  Indemnifying  Party of its  obligations  under this
               Agreement,   to  the  extent  such  failure  is  not   materially
               prejudicial.  After the Indemnifying Party assumes the defense of
               such claim or  litigation,  the  Indemnifying  Party shall not be
               liable to the  Indemnified  Party  under  this  Section 7 for any
               legal or other expenses subsequently incurred by such Indemnified
               Party  in  connection  with  the  defense  thereof,   other  than
               reasonable  costs of  investigation,  unless the named parties to
               any such  proceeding  (including any impleaded  parties)  include
               both  the  Indemnified  Party  and  the  Indemnifying  Party  and
               representation  of both  parties  by the  same  counsel  would be
               inappropriate  due to actual  or  potential  differing  interests
               between them. No  Indemnifying  Party, in the defense of any such
               claim or  litigation,  shall,  except  with the  consent  of each
               Indemnified Party, consent to entry of any judgment or enter into
               any  settlement  that does not include as an  unconditional  term
               thereof  the  giving  by  the   claimant  or  plaintiff  to  such
               Indemnified  Party of a release from all  liability in respect to
               such claim or litigation.  Each  Indemnified  Party shall furnish
               such information  regarding itself or the claim in question as an
               Indemnifying Party may reasonably request in writing and as shall
               be reasonably  required in connection  with defense of such claim
               and litigation resulting therefrom.

          (d)  If the indemnification  provided for in this Section 7 is held by
               a  court  of  competent  jurisdiction  to  be  unavailable  to an
               Indemnified  Party with  respect to any loss,  liability,  claim,
               damage,  or expense  referred to therein,  then the  Indemnifying
               Party, in lieu of indemnifying  such Indemnified Party hereunder,
               shall   contribute   to  the  amount  paid  or  payable  by  such
               Indemnified  Party as a result of such  loss,  liability,  claim,
               damage,  or  expense  in such  proportion  as is  appropriate  to
               reflect the relative fault of the  Indemnifying  Party on the one
               hand and of the Indemnified Party on the other in connection with
               the   statements  or  omissions   that  resulted  in  such  loss,
               liability,  claim,  damage,  or  expense  as  well  as any  other
               relevant  equitable  considerations.  The  relative  fault of the
               Indemnifying   Party  and  of  the  Indemnified  Party  shall  be
               determined  by  reference  to,  among other  things,  whether the
               untrue or alleged  untrue  statement  of a  material  fact or the
               omission to state a material fact relates to information supplied
               by the  Indemnifying  Party or by the  Indemnified  Party and the
               parties' relative intent, knowledge,  access to information,  and
               opportunity to correct or prevent such statement or omission.

          (e)  Notwithstanding the foregoing,  to the extent that the provisions
               on indemnification and contribution contained in the underwriting
               agreement entered into in connection with the underwritten public
               offering  are in  conflict  with the  foregoing  provisions,  the
               provisions in the underwriting agreement shall control.

8.   Information by Holder. Each Holder of Registrable  Securities shall furnish
     to the Company such information  regarding such Holder and the distribution
     proposed by such Holder as the  Company may  reasonably  request in writing
     and as shall be reasonably  required in connection  with any  registration,
     qualification, or compliance referred to in this Agreement.

9.   Rule 144 Reporting. With a view to making available the benefits of certain
     rules and  regulations  of the  Commission  that may permit the sale of the
     Restricted  Securities  to the public  without  registration,  the  Company
     agrees to use its Commercially Reasonable Efforts to:

          (a)  make and keep public information  regarding the Company available
               as those terms are  understood  and defined in Rule 144 under the
               Securities Act, at all times from and after 90 days following the
               effective date of the first registration under the Securities Act
               filed by the Company for an  offering  of its  securities  to the
               general public;




                                       9



          (b)  file with the Commission in a timely manner all reports and other
               documents  required of the Company under the  Securities  Act and
               the Exchange Act at any time after it has become  subject to such
               reporting requirements; and

          (c)  so long as a Holder owns any restricted  Registrable  Securities,
               furnish to the Holder  forthwith  upon written  request a written
               statement by the Company as to its compliance  with the reporting
               requirements  of Rule  144 (at any time  from  and  after 90 days
               following the effective date of the first registration  statement
               filed by the Company for an  offering  of its  securities  to the
               general  public),  and of the Securities Act and the Exchange Act
               (at any  time  after  it has  become  subject  to such  reporting
               requirements),  a copy of the most  recent  annual  or  quarterly
               report of the Company,  and such other  reports and  documents so
               filed as a Holder may  reasonably  request in availing  itself of
               any rule or  regulation  of the  Commission  allowing a Holder to
               sell any such securities without registration.

10.  Transfer or  Assignment  of  Registration  Rights.  The rights to cause the
     Company to  register  securities  granted to THEC  Holdings  by the Company
     under this  Agreement may be  transferred or assigned by THEC Holdings only
     to a transferee or assignee of Registrable Securities  representing no less
     than 10% of the Company's  then  outstanding  shares of Common  Stock.  Any
     transfer  or  assignment  of the  registration  rights  granted  under this
     Agreement  shall be conditioned  upon (i) the Company's being given written
     notice at the time of or within a  reasonable  time after said  transfer or
     assignment,  stating the name and address of the transferee or assignee and
     identifying the securities with respect to which such  registration  rights
     are being transferred or assigned and (ii) the assumption in writing by the
     transferee or assignee of the obligations of a Holder under this Agreement.

11.  Allocation of Registration Opportunities.  In any circumstance in which all
     of the Registrable Securities requested to be included in a registration on
     behalf of the Holders  cannot be so included as a result of  limitations of
     the aggregate  number of shares of  Registrable  Securities  that may be so
     included,  the number of shares of  Registrable  Securities  that may be so
     included  shall be  allocated  among the Holders  requesting  inclusion  of
     shares  pro rata on the  basis  of the  number  of  shares  of  Registrable
     Securities held by such Holders.  The Company shall not limit the number of
     Registrable  Securities to be included in a  registration  pursuant to this
     Agreement  in  order  to  include  shares  held  by  stockholders  with  no
     registration  rights or,  with  respect to  registrations  under  Section 3
     hereof, in order to include in such registration  securities registered for
     the Company's own account or securities other than Registrable Securities.

12.  Delay of Registration. No Holder shall have any right to take any action to
     restrain,  enjoin, or otherwise delay any registration as the result of any
     controversy  that  might  arise  with  respect  to  the  interpretation  or
     implementation of this Agreement.

13.  Termination  of  Registration  Rights.  The right of any  Holder to request
     registration  or inclusion in any  registration  pursuant to Section 3 or 4
     hereof shall terminate on such date as all shares of Registrable Securities
     held or entitled to be held upon  conversion by such Holder may immediately
     be sold under Rule 144(k) without restriction during any 90-day period.

14.      Miscellaneous.

          14.1 Governing Law. This  Agreement  shall be governed in all respects
               by the internal laws of the State of Delaware,  without reference
               to the conflicts of law principles thereof.




                                       10


          14.2 Successors and Assigns. Except as otherwise provided herein, this
               Agreement shall inure to the benefit of, and be binding upon, the
               successors,  assigns,  heirs, executors and administrators of the
               parties hereto.

          14.3 Entire Agreement.  This Agreement constitutes the full and entire
               understanding  and  agreement  between the parties with regard to
               the subjects hereof.

          14.4 Notices,  etc. All notices and other  communications  required or
               permitted  hereunder  shall be in writing  and shall be mailed by
               registered  or  certified  mail,  postage  prepaid,  or otherwise
               delivered by hand or by messenger,  including  Federal Express or
               similar courier  services,  addressed (a) if to a Holder, to such
               Holder c/o THEC Holdings at One Metrotech Center,  Brooklyn,  New
               York  11201-3850,  Attn:  President,  or at such other address as
               such Holder shall have  furnished  to the Company in writing,  or
               (b) if to the  Company,  to 1100  Louisiana  Street,  Suite 2000,
               Houston,  Texas 77002, Attn: President,  or at such other address
               as the Company  shall have  furnished to the  Holders.  Each such
               notice  or other  communication  shall for all  purposes  of this
               Agreement  be  treated  as  effective  or having  been given when
               delivered  if  delivered  personally,  or,  if  sent  by  mail or
               courier, at the earlier of its receipt or 48 hours after the same
               has been deposited in a regularly  maintained  receptacle for the
               deposit  of the  United  States  mail,  addressed  and  mailed as
               aforesaid.

          14.5 Counterparts.  This  Agreement  may be  executed in any number of
               counterparts,  each of which may be  executed by less than all of
               the  Holders,  each of which  shall be  enforceable  against  the
               parties actually  executing such  counterparts,  and all of which
               together shall constitute one instrument.

          14.6 Severability. Whenever possible, each provision of this Agreement
               will be  interpreted  in such manner as to be effective and valid
               under  applicable  law, but if any provision of this Agreement is
               held to be invalid, illegal or unenforceable in any respect under
               any applicable law or rule in any jurisdiction,  such invalidity,
               illegality or unenforceability  will not affect such provision in
               any other  jurisdiction,  and this  Agreement  will be  reformed,
               construed and enforced in such  jurisdiction  as if such invalid,
               illegal or  unenforceable  provisions  had never  been  contained
               herein.

          14.7 Titles  and  Subtitles.  The titles  and  subtitles  used in this
               Agreement  are  used  for  convenience  only  and  are  not to be
               considered in construing or interpreting this Agreement.

          14.8 Amendment.  Except as expressly  provided herein,  this Agreement
               may be amended  only upon the written  consent of the Company and
               the  Holders  of at  least  seventy-five  percent  (75%)  of  the
               Registrable Securities then subject to this Agreement.




                                       11



     IN WITNESS  WHEREOF,  this Agreement has been executed  effective as of the
date first set forth above.

                      Company:

                      THE HOUSTON EXPLORATION COMPANY


                       By: /s/ John H. Karnes
                          -------------------------------------------------
                       Name: John H. Karnes
                       Title:  Senior Vice President and Chief Financial Officer


                       THEC Holdings:

                       THEC HOLDINGS CORP.


                       By: /s/ Michael J. Nilsen
                          --------------------------------------------------
                       Name: Michael J. Nilsen
                       Title:  Vice President, Treasurer and Comptoller
















                                       12