[Letterhead of PSE&G appears here]

                                                                   EXHIBIT 10.56

                                October 10, 1986

Mr. Robert C. McNair
President
Cogen Technologies NJ, Inc.
Managing Venturer
Cogen Technologies NJ Venture
14614 Falling Creek Drive
Suite 212
Houston, Texas 77068

Re:  AGREEMENT FOR GAS SERVICE
     UNDER RATE SCHEDULE CIG
     COGEN TECHNOLOGIES NJ VENTURE
     BAYONNE, NEW JERSEY

Dear Mr. McNair:

     This Agreement is intended to confirm the understandings and agreement
between Cogen Technologies NJ Venture, a New Jersey Joint Venture under New
Jersey partnership laws (referred to herein as "Cogen") and Public Service
Electric and Gas Company (referred to herein as "PSE&G") relative to the
determination of Cogen's obligation to make payment to PSE&G pursuant to Special
Provision (c) of PSE&G's Rate Schedule CIG, which is incorporated herein by
reference, and other relevant terms and conditions. In certain respects this
Agreement supercedes the provisions of Rate Schedule CIG; however, except in
those specific instances, gas service to Cogen hereunder shall at all times be
subject to and consistent with all applicable terms and conditions of PSE&G's
Tariff for Gas Service and Rate Schedule CIG.

     In consideration of the mutual promises and obligations contained herein,
the parties to this Agreement agree to the following procedures, terms and
conditions:

     1. PSE&G will install the necessary facilities to provide, and will
        provide, up to a maximum of 3,000 MCF/hr. of gas to your site in
        Bayonne, New Jersey (the "Site"). No initial payment will be required
        for this installation, subject, however, to the conditions below. It is
        presently anticipated that the pipeline and appurtenant facilities
        required for

 
                                      -2-


        the provision of gas service hereunder will be ready for initial service
        to Cogen by April 12, 1988.

     2. As a result of (i) the uncertainties associated with the price of CIG
        gas, (ii) the projected cost of the high pressure gas main required to
        be installed in order to provide service, and (iii) the projected gas
        usage by Cogen during the first twelve (12) months of operation, sixteen
        (16) months after initial usage of gas service an amount equal to the
        actual cost of the facilities as determined by PSE&G, less 10% of the
        annual revenue (as defined in paragraph 4 below) resulting from this
        service, plus interest on this difference, shall be paid to PSE&G by
        Cogen. Should 10% of the annual revenue equal or exceed the cost of
        facilities, no payment will be required. This paragraph 2 shall
        supersede anything in Rate Schedule CIG appearing to the contrary,
        including, without limitation, Special Provision (c) set forth on First
        Revised Sheet No. 38 thereof.

     3. A month is defined as a billing period in accordance with Section 8.7 of
        our Standard Terms and Conditions for Gas Service (copy attached).

     4. The annual revenue referred to in paragraph 2 above shall be the
        aggregate of the maximum revenues received by PSE&G for any twelve of
        the first sixteen months after initial usage of service.

     5. The interest referred to in the paragraph 2 above shall be calculated
        based on the prime rate at Chase Manhattan Bank, N. A., plus 1%.
        Interest shall accrue from the time that PSE&G begins construction of
        the required facilities until such time as any required payment is made.

     6. If for any reason this project is unable to commence operation, Cogen
        shall be responsible for payment in full for the total cost incurred by
        PSE&G in pursuit of its obligations hereunder for any and all facilities
        constructed by and/or expenses incurred by PSE&G, or for which any
        financial obligations or expenses have been incurred. Provided, however,
        that in the event the project is unable to commence operation, PSE&G
        shall use reasonable efforts to find some other use for the facilities
        constructed or for which financial obligations have been incurred, and
        to the extent PSE&G can use such facilities for another purpose, Cogen's
        responsibility for the payment of the total cost of such facilities
        shall be reduced accordingly.

 
                                      -3-

     7. As security for the above obligations, Cogen shall enter into an
        irrevocable letter(s) of credit in favor of PSE&G on terms and
        conditions acceptable to PSE&G, which letter(s) of credit shall be
        executed by a commercial bank authorized to transact business in the
        State of New Jersey and acceptable to PSE&G. The letter(s) of credit
        will require the issuer to honor demands for payment made by PSE&G on
        compliance with the terms and conditions specified in the letter(s) of
        credit. The letter(s) of credit shall also be used to secure any payment
        due to PSE&G from Cogen under paragraph 2 above in the event Cogen does
        not make the payment if required by the terms of paragraph 2.

        Cogen shall establish such letter(s) of credit for and same shall be
        issued to PSE&G within thirty (30) days of execution of this Agreement.
        PSE&G shall not be obligated to order any equipment or materials
        required for construction of the gas facilities until such letter(s) of
        credit has been issued to it in acceptable form or fails to do so. In
        the event Cogen fails to establish for and have issued to PSE&G a
        letter(s) of credit consistent with the above requirements, PSE&G may
        suspend further performance under this Agreement until such letter(s) of
        credit is (are) established for and issued to PSE&G.

        The total amount to be secured ultimately by the letter(s) of credit
        shall be $4.6 million. This Agreement contemplates that the letter(s) of
        credit shall be provided according to Schedule A of this Agreement which
        schedule establishes the amounts to be secured and the dates by which
        the letter(s) shall be provided.

        Before PSE&G can demand payment from the bank providing said letter(s)
        of credit, it shall send a bill to Cogen for all costs, expenses and
        other financial obligations incurred relative to the pipeline and
        appurtenant facilities. If said bill is not paid within 30 days from the
        date thereof, PSE&G may then at any time demand payment under said
        letter(s) of credit from bank.

        Once gas service to Cogen commences, the outstanding amount under the
        letter(s) of credit may be reduced by Cogen over the ensuing 16 month
        period to reflect the extent to which actual gas revenue has reduced the
        potential liability of Cogen under this Agreement. Within 30 days
        following the end of each three billing months commencing with the start
        of gas

 
                                      -4-

        service, PSE&G will advise Cogen in writing of the extent to which the
        total $4.6 million amount or any subsequently reduced amount as secured
        by the letter(s) of credit may be reduced as a result of actual gas
        revenue. There will be a final reconciliation within 30 days following
        the conclusion of the sixteen (16) month period.

        In calculating the amount by which the letter of credit may be reduced
        at the given intervals, the amount of any reduction will be equal to the
        current face amount of the letter of credit less the actual cost of the
        facilities as determined by PSE&G plus 10% of the cumulative revenue
        received by PSE&G for gas service rendered to Cogen commencing with the
        start of gas service, except that in any calculation occurring after the
        twelfth billing month, including the final reconciliation, the "annual
        revenue" as defined in paragraph 4 of this Agreement shall be used in
        lieu of the "cumulative revenue" above. In the event the result of this
        calculation is zero, or a negative amount, no reduction in the amount of
        the letter of credit will occur.

     8. The making of a payment by Cogen will not give it any interest in the
        facilities, such ownership being vested exclusively in PSE&G.

     9. Notwithstanding anything herein appearing to the contrary, Cogen
        reserves the right to notify PSE&G in writing to suspend the performance
        of the work of PSE&G in installing the gas facilities contemplated
        hereunder, at any time prior to the completion thereof, for any reason,
        including, without limitation, the occurrence of am Imminent Suspension
        Event, Suspension Event or a Matured Suspension Event as such terms are
        defined in the Construction Loan Agreement between Cogen Technologies NJ
        Venture and General Electric Power Funding Corporation, relating to
        financing of the contemplated cogeneration project at Cogen's Bayonne,
        New Jersey site.

    10. With regard to Cogen's obligations to be a qualifying facility under
        Rate Schedule CIG, Cogen shall provide PSE&G with a copy of its
        qualifying facility certification as granted by the Federal Energy
        Regulatory Commission before service under Rate Schedule CIG is
        supplied. Cogen is obligated to maintain its QF status. In the event
        that Cogen makes any modification to its cogeneration facility or to its
        operation of such facility that differs

 
                                      -5-

        from the representations contained in Cogen's application for qualifying
        facility certification, Cogen shall furnish PSE&G, upon request, a
        recertification order of the Commission, or, in the alternative, at
        Cogen's discretion, an opinion of counsel that the cogeneration facility
        still qualifies as a qualifying facility under the Federal Energy
        Regulatory Commission's rules.

    11. It is acknowledged that Cogen may assign this Agreement to a third party
        which has provided financing for the project, provided Cogen has
        requested in writing of PSE&G a consent to such assignment explaining
        the reasons therefor; however, any such assignment shall be subject to
        assignee accepting in writing all of the terms and conditions of this
        Agreement. Such assignment agreement shall be provided to PSE&G for
        review and approval prior to its effectiveness. Consent by PSE&G shall
        not be unreasonably withheld.

    12. In the event PSE&G files for and/or proposes any future changes in its
        Rate Schedule CIG, it shall advise Cogen in writing within fourteen (14)
        days from the date of such filing.

     My signature below confirms PSE&G's agreement with all the terms and
conditions of this Agreement, and your signature at the indicated location will
similarly confirm Cogen's agreement with all the terms and conditions contained
herein. Accordingly, please sign this agreement and return it to me along with
the signed Application for CIG, which is attached.

                                        Very truly yours,

                                        /s/ Louis L. Rizzi
                                        -------------------------------
                                        Louis L. Rizzi
                                        Vice President--Customer and 
                                         Marketing Services

Accepted:

/s/ Robert McNair
- ------------------------------
R. McNair--President 
Cogen Technologies NJ, Inc. 
Managing Venturer 
On behalf of Cogen Technologies NJ Venture

 
                                  SCHEDULE A

                                            Total Amount of $ To Be   
Date Letter(s) of Credit Due            Secured by Letter(s) of Credit 
- ----------------------------            ------------------------------
    November 10, 1986                                   450,000
    February 1, 1987                                    850,000
    April 1, 1987                                     1,350,000
    May 1, 1987                                       2,850,000
    June 1, 1987                                      3,150,000
    July 1, 1987                                      3,500,000
    August 1, 1987                                    4,200,000
    September 1, 1987                                 4,600,000 

 
                      APPLICATION FOR RATE SCHEDULE CIG
                      COGENERATION INTERRUPTIBLE SERVICE

TO PUBLIC SERVICE ELECTRIC AND GAS COMPANY:

                        Cogen Technologies N J Venture

requests Public Service Electric and Gas Company (PSE&G)  to supply gas service
under Rate Schedule Cogeneration Interruptible Service (CIG) at

                        Foot of E. 22nd Street, Bayonne

for a maximum annual requirement of 176,000,000 therms

and a maximum hourly requirement of 30,000 therms, for the operation of the
following equipment:

Four gas turbines, one steam turbine, supplementary firing equipment.

Upon acceptance by PSE&G, it is understood and agreed that:

(1) Customer shall take and pay for the service in accordance with Rate Schedule
    CIG and the Standard Terms and Conditions referred to therein and in
    accordance with any changes or modification thereof as provided in Section
    14 of the Standard Terms and Conditions for Gas Service.

(2) Customer shall obtain approval from PSE&G before making any changes in the
    connected equipment served under this provision and a new application will
    be required.

(3) Rate Schedule CIG will become effective on the date service is provided.

(4) Customer shall provide a 120 volt source of electric for the operation of
    the gas metering equipment.

(5) Customer shall pay to Public Service $ * as a contribution towards
    facilities in accordance with the terms of Special Provision (c) Rate
    Schedule CIG.

(6) Gas supplied in excess of the quantity described in Special Provision (m)
    shall be billed under Rate Schedule LVG except as specified under Special
    Provision (e).

(7) Customer shall provide Public Service with their Qualifying Facilities
    Certification as granted by the Federal Energy Regulatory Commission before
    service is supplied.

    * See attached letter agreement.

 
(8) Customer shall file, with Public Service, a monthly report of the
    kilowatthours produced and volume of other fuels used by the cogeneration
    facility.

(9) Customer shall install, maintain and make accessible for reading by Public
    Service such electric meters as necessary for determining the volume of gas
    applicable to Rate Schedule CIG.

Accepted:

Public Service Electric and             Cogen Technologies
Gas Company                             N J Venture

By  /s/ Louis L. Rizzi                  By  /s/ Robert McNair
  -------------------------------         --------------------------------
  Title: Vice President--Customer         President
         and Marketing Services           Cogen Technologies NJ, Inc.
  Date:  10/10/86                         Managing Venturer