Document:

<PAGE>

                                                                    Exhibit 10.5

                   FIRM NATURAL GAS TRANSPORTATION AGREEMENT

     THIS FIRM NATURAL GAS TRANSPORTATION AGREEMENT ("Agreement") is entered
into this 29/th/ day of March, 1991 between TENNESSEE GAS PIPELINE COMPANY, a
Delaware corporation, herein called "Transporter", and PROJECT ORANGE
ASSOCIATES, L.P., a Delaware limited partnership, herein called "Shipper",
pursuant to the following general terms and representations.

                              W I T N E S S E T H:
                              --------------------

     WHEREAS, Transporter owns and operates a natural gas transmission pipeline
system which extends in a northeasterly direction from its principal sources of
supply in Texas and Louisiana through the States of Texas, Louisiana, Arkansas,
Mississippi, Alabama, Tennessee, Kentucky, West Virginia, Ohio, Pennsylvania,
New York, New Jersey, Massachusetts, New Hampshire, Rhode Island and
Connecticut; and

     WHEREAS, Shipper has entered into certain gas purchase contracts with
various producers providing for the sale by such producers to Shipper of a
maximum quantity of 20,000 dekatherms ("Dth") of natural gas per day and has
made arrangements for the delivery of such natural gas for the account of
Shipper to the points listed in Exhibit A hereto; and

     WHEREAS, G.A.S. Orange Development, Inc. ("G.A.S. Orange") and Transporter
have entered into a Precedent Agreement dated January 13, 1989 (the "Precedent
Agreement"), pursuant to which Transporter agreed to file an application with
the Federal Energy Regulatory Commission ("FERC") for the necessary
authorizations to (i) provide firm natural gas transportation service of a daily
quantity not to exceed 20,000 Dth of natural gas, and (ii) construct and operate
the facilities necessary to provide such firm transportation service;

     WHEREAS, G.A.S. Orange has assigned all of its rights and obligations under
the Precedent Agreement to Shipper; and

     WHEREAS, Transporter has now been authorized by the FERC order issued on
September 13, 1990 in Docket No. CP88-171-001, to render the firm transportation
service described herein and to construct and operate the necessary facilities
therefor; and

     WHEREAS, Transporter and Shipper wish to set forth herein the specific
terms and conditions under which Transporter will provide such transportation
service to Shipper;

     NOW, THEREFORE, in consideration of the premises and of the mutual
agreements herein contained, Transporter and Shipper agree as follows:
<PAGE>

                                   ARTICLE I
                                   ---------

                                  DEFINITIONS
                                  -----------

1.1 Equivalent Quantity -- shall mean, during any given period of time, a
    -------------------
    quantity of gas equal to the quantity of gas received by Transporter
    for the account of Shipper for transportation hereunder at the Point(s)
    of Receipt, less quantities for Transporter's system fuel and use
    requirements and gas lost and unaccounted for associated with this
    transportation service, which may be provided by Transporter or Shipper
    as specified in Article VIII, Section 4. For purposes of determining an
    Equivalent Quantity, quantities of gas shall be stated in dekatherms
    and measured on a dry basis.

1.2 Point(s) of Receipt -- shall mean those points as specified in Exhibit A
    -------------------
    attached hereto at which Transporter shall receive gas for
    transportation hereunder and such other points as may be agreed to from
    time to time by both parties.

1.3 Point(s) of Delivery -- shall mean those points as specified on Exhibit A
    --------------------
    attached hereto at which Transporter shall deliver gas to Shipper and
    such other points as may be agreed to from time to time by both
    parties.

1.4 Transportation Quantity -- shall mean the maximum daily quantity of natural
    -----------------------
    gas that Transporter hereby agrees to receive, subject to Article II
    herein, for the account of Shipper at the Point of Receipt during the
    term hereof, which shall be 20,000 Dth, provided that Transporter is
    under no obligation to receive a volume in excess of 20,000 Mcf.

                                   ARTICLE II
                                   ----------

                                 TRANSPORTATION
                                 --------------

2.1 Transportation Service -- After receipt and acceptance by Transporter of
    ----------------------
    FERC authorization to provide service hereunder and completion of the
    facilities required to provide such service, beginning on the
    Commencement Date (as defined in Article VIII, Section 8.1 hereof),
    Transporter agrees to accept and receive daily, on a firm basis, at the
    Point of Receipt, from Shipper such quantity of gas as Shipper makes
    available up to the Transportation Quantity and to transport and
    deliver for Shipper to the Point(s) of Delivery an Equivalent Quantity
    of gas.

                                  ARTICLE III
                                  -----------

                         RECEIPT AND DELIVERY PRESSURES
                         ------------------------------

3.1 Shipper shall cause the delivery of natural gas to Transporter at the
    Point(s) of Receipt to be at pressures sufficient to enter
    Transporter's pipeline system.

                                      -2-
<PAGE>

3.2 Transporter shall cause the delivery of natural gas to Shipper at the
    Point(s) of Delivery as nearly as practicable at Transporter's line
    pressure, provided that pressure shall not be less than 400 pounds per
    square inch gauge.

                                   ARTICLE IV
                                   ----------

                      CONTROL AND BALANCING OF DELIVERIES
                      -----------------------------------

     The control and balancing of deliveries shall be as provided in Article
III, Section 7 of the General Terms and Conditions of Transporter's FERC Gas
Tariff Volume No. 1.

                                   ARTICLE V
                                   ---------

             QUALITY SPECIFICATIONS AND STANDARDS FOR MEASUREMENTS
             -----------------------------------------------------

     For all gas received, transported and delivered hereunder, the parties
agree to the quality specifications and standards for measurement provided for
in Articles II and III of the General Terms and Conditions of Transporter's FERC
Gas Tariff Volume No. 1.

                                   ARTICLE VI
                                   ----------

                                   FACILITIES
                                   ----------

     Transporter shall construct, install, own and operate the facilities,
including but not limited to measurement facilities and hot tap, necessary for
Transporter to receive and deliver the gas as contemplated herein for Shipper's
account at the Point(s) of Receipt and the Point(s) of Delivery.

                                  ARTICLE VII
                                  -----------

                           DISPATCHER'S NOTIFICATION
                           -------------------------

     Shipper's dispatcher shall notify Transporter's dispatcher of the daily
volume which Shipper desires Transporter to transport on any day in the manner
set forth in Article III, Section 4 of the General Terms and Conditions of
Transporter's FERC Gas Tariff Volume No. 1.

                                  ARTICLE VIII
                                  ------------

                               RATES FOR SERVICE
                               -----------------

8.1  Commencement of Service. Upon completion of construction of the pipeline
     -----------------------
     facilities required to enable Transporter to render the transportation
     service

                                      -3-
<PAGE>

     described herein, Transporter will notify Shipper in writing of the date on
     which Transporter will be ready to commence transportation service under
     this Contract. The "Commencement Date" shall be 30 days after the date of
     Transporter's notice.

8.2  Transportation Rates -- Beginning on the Commencement Date, the
     --------------------
     compensation to be paid by Shipper to Transporter for the
     transportation service provided for herein shall be payable monthly in
     accordance with Article X hereof and shall be equal to the sum of the
     following: (a) the product of (1) the sum of the "D-l" charges for
     Segments 1 and 2 under Transporter's NET-EU Rate Schedule and (2) the
     Transportation Quantity, (b) the product of (1) the sum of the "D-2"
     charges for Segments 1 and 2 under Transporter's NET-EU Rate Schedule
     and (2) the "D-2 Billing Determinant" for the applicable billing
     period as set forth in Exhibit B hereto, (c) the product of (1) the
     sum of the "Commodity" charges for Segments 1 and 2 under
     Transporter's NET-EU Rate Schedule and any applicable surcharges as
     included in Transporter's effective FERC Gas Tariff and (2) the
     quantity of gas delivered by Transporter to Shipper during the
     applicable billing period. References herein to Transporter's NET-EU
     Rate Schedule shall include any successor or substitute rate schedule.

8.3  Fuel and Use Quantity  Prior to the Commencement Date (as defined in
     ---------------------
     Section 8.1 hereof) Transporter and Shipper shall mutually agree whether
     Transporter or Shipper shall supply the fuel required for transportation
     hereunder. In the event Transporter and Shipper agree that Transporter
     shall supply the fuel required for fuel and losses ("Fuel and Use
     Quantity"), Transporter shall charge Shipper an amount equal to the
     product of (a) Transporter's Current Average Cost of Purchased Gas plus
     adjustment pursuant to Section 3 of Article XXIII of Transporter's FERC
     Gas Tariff, Volume No. 1, and (b) the Fuel and Use Quantity.
     Transporter's provision of the fuel required for transportation
     hereunder is subject to termination on 30 days' written notice, at the
     option of either Transporter in its sole discretion or Shipper in its
     sole discretion. In the event that Transporter does not provide the Fuel
     and Use Quantity as stated above, then Shipper shall make available to
     Transporter from the Transportation Quantity the amount of gas equal to
     the Fuel and Use Quantity. For purposes of this Agreement, the Fuel and
     Use Quantity will be computed and allocated in the same manner in which
     Fuel and Use Quantity is computed and allocated for service under
     Transporter's Rate Schedule FT-A.

8.4  Rate Changes -- Shipper agrees that Transporter shall have the unilateral
     ------------
     right pursuant to this Article VIII to file and make effective changes
     in the rates, charges, and conditions applicable to service pursuant
     to the Rate Schedule under which this service is rendered and/or any
     provisions of the General Terms and Conditions of Transporter's FERC
     Gas Tariff Volume No. 1 as such Tariff may be revised or replaced from
     time to time. Without prejudice to Shipper's right to contest such
     charges, Shipper agrees to pay the effective rate for service rendered
     pursuant to this Agreement, subject to FERC review and adjustment.

                                      -4-
<PAGE>

                                   ARTICLE IX

                     RESPONSIBILITY DURING TRANSPORTATION
                     ------------------------------------

     As between the parties hereto, it is agreed that from the time gas is
delivered by Shipper to Transporter at the Point of Receipt and prior to
delivery of such gas to or for the account of Shipper at the Point(s) of
Delivery, Transporter shall have the unqualified right to commingle such gas
with other gas in its pipeline system and shall have the unqualified right to
handle and treat such gas as its own.

                                   ARTICLE X
                                   ---------

                             BILLINGS AND PAYMENTS
                             ---------------------

     Transporter and Shipper agree that the obligations of Transporter and
Shipper for billing and payment for the services provided hereunder shall be in
accordance with Articles V and VI of the General Terms and Conditions of
Transporter's FERC Gas Tariff Volume No. 1.

                                   ARTICLE XI
                                   ----------

                RATE SCHEDULES AND GENERAL TERMS AND CONDITIONS
                -----------------------------------------------

     This Agreement and all terms and provisions contained or incorporated
herein are subject to the provisions of Transporter's applicable Rate Schedules
and of Transporter's General Terms and Conditions on file with the FERC, or
other duly constituted authorities having jurisdiction, and as the same may be
legally amended or superseded, which Rate Schedules and General Terms and
Conditions are by this reference made a part hereof.

                                  ARTICLE XII
                                  -----------

                               TERM OF AGREEMENT
                               -----------------

     This Agreement shall become effective on the date hereof; provided,
however, that Transporter shall be under no obligation to receive or to deliver
any quantities of natural gas hereunder prior to the Commencement Date as
defined in Article VIII, Section 8.1 hereof. This Agreement shall continue in
force and effect until the expiration of 20 years following the Commencement
Date hereunder and from year to year thereafter; provided, however, that either
party may elect to terminate this Agreement as of the end of such 20 year period
or as of the end of any extended annual period by giving 12 months prior written
notice of such termination to be effective on the expiration of such 20 year
period or the applicable anniversary of such period.

                                      -5-
<PAGE>

                                  ARTICLE XIII
                                  ------------

                                   REGULATION
                                   ----------

     This Agreement shall be subject to all applicable governmental statutes and
all applicable and lawful orders, rules, and regulations.

                                  ARTICLE XIV
                                  -----------

                                    WARRANTY
                                    --------

     Shipper warrants that it will at the time of delivery of gas to Transporter
hereunder have good title to and the good right to deliver all gas so made
available. Transporter warrants that it will, at the time of delivery of gas for
the account of Shipper hereunder, have the right to deliver all such gas. Each
party warrants to the other and such other party's successors and assigns that
the gas covered by its warranty hereunder shall be free and clear of all liens,
encumbrances, or claims against the warranting party or its affiliates for use
of property of such party or its affiliates. Each party will indemnify the other
and save it harmless from all suits, actions, debts, accounts, damages, costs,
losses, and expenses arising from or out of any adverse claims regarding title
and/or right to delivery of any or all persons against the indemnifying party
and/or to royalties, taxes, license fees, or charges assessed against such
party. Title to the gas received, transported, and delivered hereunder shall at
all times remain with Shipper and shall not pass to Transporter; provided that
title to the gas delivered by Shipper hereunder for fuel and use requirements of
Transporter as set forth in Article VIII herein, shall pass to Transporter upon
delivery of said gas to Transporter at the Point(s) of Receipt.

                                   ARTICLE XV
                                   ----------

                                  ASSIGNMENTS
                                  -----------

15.1 Either party may assign or pledge this Agreement and all rights and
     obligations hereunder under the provisions of any mortgage, deed of
     trust, indenture, or other instrument which it has executed or may
     execute hereafter as security for indebtedness, provided such
     assignment is consistent with the terms and conditions of the Letter
     of Credit Drawing Agreement executed by Shipper and Transporter.
     Either party may without relieving itself of its obligations under
     this Agreement, assign any of its rights hereunder to a wholly owned
     affiliate, but otherwise no assignment of this Agreement or any of the
     rights or obligations hereunder shall be made unless there first shall
     have been obtained the written consent thereto of the other party,
     which consent shall not be unreasonably withheld.

15.2 Any entity which shall succeed by purchase, merger, or consolidation to the
     properties, substantially or as an entirety, of either party hereto
     shall be entitled to the rights and shall be subject to the
     obligations of its predecessor in interest under this Agreement.

                                      -6-
<PAGE>

                                  ARTICLE XVI
                                  -----------

                                 MISCELLANEOUS
                                 -------------

16.1 No modification of or supplement to the terms and provisions hereof shall
     be or become effective, except by the execution of supplementary
     written consent.

16.2 No waiver by either party of any one or more defaults by the other in the
     performance of any provisions of this Agreement shall operate or be
     construed as a waiver of any future default or defaults, whether of a
     like or of a different character.

16.3 Except as herein otherwise provided, any notice, request, demand,
     statement, or bill provided for in this Agreement or any notice which
     either party may desire to give to the other shall be in writing and
     mailed by registered or certified mail to the post office address of
     the party intended to receive the same, as the case may be, as
     follows:

TRANSPORTER:                              Tennessee Gas Pipeline Company
------------                              P. 0. Box 2511
                                          Houston, Texas 77252
                                          Attention:  Market Services

Invoices:                                 Attention:  Gas Accounting

Payments:                                 Attention:  Treasury Department

Gas Analysis and                          Attention:  Measurement Department
Volume Statements:

SHIPPER                                   Project Orange Associates, L.P.
-------                                   630 First Avenue, Suite 30C
                                          New York, New York 10016
                                          Attention:  Mr. Adam H. Victor

     or to such other address as either party shall designate by formal
     written notice to the other. Routine communications, including monthly
     statements and payments, may be mailed by registered, certified or
     ordinary mail.

16.4 This Agreement shall be interpreted under the laws of the State of Texas,
     except insofar as such laws refer to the laws of another jurisdiction.

16.5 Exhibits A and B attached hereto are incorporated herein by reference
     and made a part of this Agreement for all purposes.

                                      -7-
<PAGE>

16.6 This Agreement, as of the date hereof, shall supersede and cancel the
     Precedent Agreement.

     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed in multiple counterparts as of the date first hereinabove written.

                             TENNESSEE GAS PIPELINE COMPANY

                             BY: /s/
                                _______________________________________

                             PROJECT ORANGE ASSOCIATES, L.P.
                             By G.A.S. Orange Partners, L.P.,
                              Its General Partner

                             By G.A.S. Orange Development, Inc.,
                              Its General Partner

                             BY: /s/ Adam Victor
                                _______________________________________

                                      -8-
<PAGE>

                                   EXHIBIT A

TO FIRM TRANSPORTATION AGREEMENT DATED MARCH 29, 1991 BETWEEN PROJECT ORANGE
ASSOCIATES, L.P. AND TENNESSEE GAS PIPELINE COMPANY ("TENNESSEE")

RECEIPT POINT(S):        Point of interconnection between Tennessee and the
----------------         facilities of TransCanada PipeLines Limited at the
                         Niagara River near Lewiston, New York

DELIVERY POINT(S):       New delivery point located at MLV 241 on Tennessee's
-----------------        "200" main line near Syracuse, New York.

                                      -9-
<PAGE>

                                   EXHIBIT B

             TO FIRM TRANSPORTATION AGREEMENT DATED MARCH 29, 1991
                  BETWEEN PROJECT ORANGE ASSOCIATES, L.P. AND
                         TENNESSEE GAS PIPELINE COMPANY

Billing Period                 Number of Days            D-2 Billing
--------------                 --------------            Determinants
                                                         ------------

January                        31                        527,000

February                       28                        476,000

March                          31                        527,000

April                          30                        510,000

May                            31                        527,000

June                           30                        510,000

July                           21                        527,000

August                         31                        527,000

September                      30                        510,000

October                        31                        527,000

November                       30                        510,000

December                       31                        527,000

                                      -10-<PAGE>

                                                                    EXHIBIT 10.6

                                                       SERVICE PACKAGE NO. 31603
                                                            AMENDMENT NO.0

                         GAS TRANSPORTATION AGREEMENT
                       (For Use Under Rate Schedule IT)

THIS AGREEMENT is made and entered into as of the 11th day of November, 1999, by
and between TENNESSEE GAS PIPELINE COMPANY, a Delaware Corporation, hereinafter
referred to as "Transporter" and PROJECT ORANGE ASSOCIATES L P, a DELAWARE
Corporation, hereinafter referred to as "Shipper." Transporter and Shipper shall
collectively be referred to herein as the "Parties."

                                   ARTICLE I

                                  DEFINITIONS

1.1  TRANSPORTATION QUANTITY - shall mean the maximum daily quantity of gas
     which Transporter agrees to receive and transport, subject to Article II
     herein, for the account of Shipper hereunder on each day during each year
     during the term hereof which shall be 5,000 dekatherms.

1.2  EQUIVALENT QUANTITY - shall be as defined in the Article I of the General
     Terms and Conditions of Transporter's FERC Gas Tariff.

                                   ARTICLE II

                                 TRANSPORTATION

     Transporter agrees to accept and receive daily on an interruptible basis,
as determined in Transporter's sole opinion, at the Point(s) of Receipt, from
Shipper or for Shipper's account such quantity of gas as Shipper makes available
up to the Transportation Quantity of gas and deliver for Shipper to the Delivery
Point(s) an Equivalent Quantity of gas.

                                  ARTICLE III

                                   FACILITIES

     All Facilities are in place to render the service provided for in this
Agreement and Transporter shall have no obligation to build facilities to
perform this service.
<PAGE>

                                                       SERVICE PACKAGE NO. 31603
                                                            AMENDMENT NO.0

                         GAS TRANSPORTATION AGREEMENT
                       (For Use Under Rate Schedule IT)

                                   ARTICLE IV

              QUALITY SPECIFICATIONS AND STANDARDS FOR MEASUREMENT

     For all gas received, transported and delivered hereunder the Parties agree
to the Quality Specifications and Standards for Measurement as specified in the
General Terms and Conditions of Transporter's FERC Gas Tariff Volume No. 1.  To
the extent that no new measurement facilities are installed to provide service
hereunder, measurement operations will continue in the manner in which they have
previously been handled.  In the event that such facilities are not operated by
Transporter or a downstream pipeline, then responsibility for operations shall
be deemed to be Shipper's.

                                   ARTICLE V

                    RATES AND CHARGES FOR GAS TRANSPORTATION

5.1  TRANSPORTATION RATES - Commencing with the date of initial receipt of gas
     by rates, charges and surcharges to be paid by Shipper to Transporter for
     the transportation service provided herein shall be in accordance with
     Transporter's Rate Schedule IT and the General Terms and Conditions of
     Transporter's FERC Gas Tariff.

5.2  INCIDENTAL CHARGES - Shipper agrees to reimburse Transporter for any filing
     or similar fees, which have not been previously paid by Shipper, which
     Transporter incurs in rendering service hereunder.

5.3  CHANGES IN RATES AND CHARGES - Shipper agrees that Transporter shall have
     the unilateral right to file with the appropriate regulatory authority and
     make changes effective in (a) the rates and charges applicable to service
     pursuant to Transporter's Rate Schedule IT, (b) the rate schedule(s)
     pursuant to which service hereunder is rendered, or (c) any provision of
     the General Terms and Conditions applicable to those rate schedules.
     Transporter agrees that Shipper may protest or contest the aforementioned
     filings, or may seek authorization from duly constituted regulatory
     authorities for such adjustment of Transporter's existing FERC Gas Tariff
     as may be found necessary to assure Transporter just and reasonable rates.

                                   ARTICLE VI

                             BILLINGS AND PAYMENTS
<PAGE>

                                                       SERVICE PACKAGE NO. 31603
                                                            AMENDMENT NO.0

                         GAS TRANSPORTATION AGREEMENT
                       (For Use Under Rate Schedule IT)

Transporter shall bill and Shipper shall pay all rates and charges in accordance
with Articles V and VI, respectively, of the General Terms and Conditions of
Transporter's FERC Gas Tariff.

                                  ARTICLE VII

                          GENERAL TERMS AND CONDITIONS

This Agreement shall be subject to the effective provisions of Transporter's
Rate Schedule IT and to the General Terms and Conditions incorporated therein,
as the same may be changed or superseded from time to time in accordance with
the rules and regulations of the FERC.

                                  ARTICLE VIII

                                   REGULATION

8.1  This Agreement shall be subject to all applicable and lawful governmental
     statutes, orders, rules and regulations and is contingent upon the receipt
     and continuation of all necessary regulatory approvals or authorizations
     upon terms acceptable to Transporter. This Agreement shall be void and of
     no force and effect if any necessary regulatory approval is not so obtained
     or continued.  All Parties hereto shall cooperate to obtain or continue all
     necessary approvals or authorizations, but no Party shall be liable to any
     other Party for failure to obtain or continue such approvals or
     authorizations.

8.2  The transportation service described herein shall be provided subject to
     Subpart G, Part 284 of the FERC Regulations.

                                   ARTICLE IX

                      RESPONSIBILITY DURING TRANSPORTATION

     Except as herein specified, the responsibility for gas during
transportation shall be as stated in the General Terms and Conditions of
Transporter's FERC Gas Tariff Volume No. 1.

                                   ARTICLE X

                                   WARRANTIES
<PAGE>

                                                       SERVICE PACKAGE NO. 31603
                                                            AMENDMENT NO. 0

                         GAS TRANSPORTATION AGREEMENT
                       (For Use Under Rate Schedule IT)

10.1 In addition to the warranties set forth in Article IX of the General Terms
     and Conditions of Transporter's FERC Gas Tariff, Shipper warrants the
     following:

     (a)  Shipper warrants that all upstream and downstream transportation
          arrangements are in place, or will be in place as of the requested
          effective date of service, and that it has advised the upstream and
          downstream transporters of the receipt and delivery points under this
          Agreement and any quantity limitations for each point.  Shipper agrees
          to indemnify and hold Transporter harmless for refusal to transport
          gas hereunder in the event any upstream or downstream transporter
          fails to receive or deliver gas as contemplated by this Agreement.

     (b)  Shipper agrees to indemnify and hold Transporter harmless from all
          suits, actions, debts, accounts, damages, costs, losses and expenses
          (including reasonable attorneys fees) arising from or out of breach of
          any warranty by Shipper herein.

10.2 Transporter shall not be obligated to provide or continue service hereunder
     in the event of any breach of warranty.

                                   ARTICLE XI

                                      TERM

11.1 This Agreement shall be effective from the date hereof and shall remain in
     full force and effect on a month to month basis unless terminated by either
     Party upon at least thirty (30) days prior written notice to the other
     Party.

11.2 Any portions of this Agreement necessary to resolve or cash-out imbalances
     under this Agreement as required by the General Terms and Conditions of
     Transporter's FERC Gas Tariff Volume No. 1, shall survive the other parts
     of this Agreement until such time as such balancing has been accomplished;
     provided, however, that Transporter notifies Shipper of such imbalance no
     later than twelve months after the termination of this Agreement.

11.3 This Agreement will terminate automatically upon written notice from
     Transporter in the event Shipper fails to pay all of the amount of any bill
     for service rendered by Transporter hereunder in accord with the terms and
     conditions of Article VI of the General Terms and Conditions of
     Transporter's FERC Tariff.
<PAGE>

                                                       SERVICE PACKAGE NO. 31603
                                                            AMENDMENT NO.0

                         GAS TRANSPORTATION AGREEMENT
                       (For Use Under Rate Schedule IT)

                                  ARTICLE XII

                                     NOTICE

     Except as otherwise provided in the General Terms and Conditions applicable
to this Agreement, any notice under this Agreement shall be in writing and
mailed to the post office address of the Party intended to receive the same, as
follows:

         TRANSPORTER:  TENNESSEE GAS PIPELINE COMPANY
                       P.O. Box 2511
                       Houston, Texas 77252-2511

                       Attention:  Director, Transportation Control

         SHIPPER:

         NOTICES:      PROJECT ORANGE ASSOCIATES L P
                       C/O GPU INTERNATIONAL, INC.
                       ONE UPPER POND ROAD
                       PARSIPPANY, NJ 07054

                       Attention: TOM REILLY

         BILLING:      PROJECT ORANGE ASSOCIATES L P
                       C/O GPU INTERNATIONAL, INC.
                       ONE UPPER POND ROAD
                       PARSIPPANY, NJ 07054

                       Attention: TOM REILLY

or to such other address as either Party shall designate by formal written
notice to the other.
<PAGE>

                                                       SERVICE PACKAGE NO. 31603
                                                            AMENDMENT NO.0

                         GAS TRANSPORTATION AGREEMENT
                       (For Use Under Rate Schedule IT)

                                  ARTICLE XIII

                                   ASSIGNMENT

     Any person which shall succeed by purchase, merger, or consolidation to the
properties, substantially as an entirety, of either Party hereto shall be
entitled to the rights and shall be subject to the obligations of its
predecessor in interest under this Agreement.  Otherwise, this Agreement shall
not be assigned.

                                  ARTICLE XIV

                                 MISCELLANEOUS

14.1 THE INTERPRETATION AND PERFORMANCE OF THIS CONTRACT SHALL BE IN ACCORDANCE
     WITH AND CONTROLLED BY THE LAWS OF THE STATE OF TEXAS, WITHOUT REGARD TO
     THE DOCTRINES GOVERNING CHOICE OF LAW.

14.2 If any provision of this Agreement is declared null and void, or voidable,
     by a court of competent jurisdiction, then that provision will be
     considered severable at either Party's option; and if the severability
     option is exercised, the remaining provisions of the Agreement shall remain
     in full force and effect.

14.3 Unless otherwise expressly provided in this Agreement or Transporter's FERC
     Gas Tariff, no modification of or supplement to the terms and provisions
     stated in this Agreement shall be or become effective, until Shipper has
     submitted a request for change through the Electronic Bulletin Board and
     Shipper has been notified through the Electronic Bulletin Board of
     Transporter's agreement to such change.

     IN WITNESS WHEREOF, the Parties hereto have caused this Agreement to be
duly executed as of the date first hereinabove written.

                      TENNESSEE GAS PIPELINE COMPANY

                      BY:  /s/ Matthew W. Rowland
                           __________________________
                            Agent and Attorney-in-Fact
<PAGE>

                                                       SERVICE PACKAGE NO. 31603
                                                            AMENDMENT NO. 0

                         GAS TRANSPORTATION AGREEMENT
                       (For Use Under Rate Schedule IT)

                      PROJECT ORANGE ASSOCIATES LP

                      BY:     /s/ Beth Matheson
                              __________________________
                      TITLE:  Vice President
                              __________________________
                      DATE:   November 18, 1999
                              __________________________

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