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                                                                 EXHIBIT 10.7.11

***PORTIONS OF THIS EXHIBIT MARKED BY BRACKETS ("[***]") OR OTHERWISE INDICATED
HAVE BEEN OMITTED PURSUANT TO A REQUEST FOR CONFIDENTIAL TREATMENT. THE OMITTED
PORTIONS HAVE BEEN FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION.***

                              GAS SUPPLY AGREEMENT

                                     BETWEEN

                        DYNEGY CANADA MARKETING AND TRADE

                                       AND

                     SITHE/INDEPENDENCE POWER PARTNERS, L.P.

                                  JULY 1, 2001

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                              GAS SUPPLY AGREEMENT

      GAS SUPPLY AGREEMENT ("Agreement") dated as of July 1, 2001 between
Sithe/Independence Power Partners, L.P. (a Delaware limited partnership,
"Independence"), and Dynegy Canada Marketing and Trade (a division of Dynegy
Canada Inc., an Alberta corporation, "Supplier"); (each of Independence and
Supplier referred to herein individually, as a "Party," and collectively, as the
"Parties"),

                                   WITNESSETH:

      WHEREAS, Independence owns a natural gas fired electric generating plant
of approximately 1,032 MW net capacity located in the Town of Scriba, New York
(the "Facility");

      WHEREAS, Dynegy Power Marketing, Inc. ("DPM") and Independence have
entered into a certain Tolling Agreement dated as of July 1, 2001 (the "Tolling
Agreement"); and

      WHEREAS, Independence desires to purchase from Supplier all of its
requirements for Gas, excluding Gas for which DPM is responsible under the
Tolling Agreement;

      NOW THEREFORE, in consideration of the mutual promises and agreements
contained herein, Independence and Supplier, intending to be legally bound,
agree as follows:

                             ARTICLE I - DEFINITIONS

      1.01 FORMAT

            (a) References to Articles and Sections herein are cross-references
to Articles and Sections, respectively, in this Agreement, unless otherwise
stated.

            (b) All Schedules that are attached to this Agreement are
incorporated by reference as if fully set forth herein.

            (c) All references to quantities of Gas are references on an HHV
basis unless otherwise stated.

      1.02 DEFINITIONS

      In addition to the terms defined elsewhere in this Agreement, when used
with initial capitalization, whether singular or plural, the following terms
shall

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have the meanings set forth below. All references in this Agreement to any
governmental or non-governmental entity, including, without limitation, NYISO
and FERC, shall include any and all successors to such entities. Unless the
context otherwise requires, any reference herein to any contract, agreement or
tariff and any schedule, attachment or exhibit thereto shall mean such contract,
agreement, tariff, schedule, attachment or exhibit as amended, supplemented and
modified and in effect from time to time.

(1)   "Affiliate" means, with respect to any entity, any other entity that,
      directly or indirectly, through one or more intermediaries, controls, or
      is controlled by, or is under common control with, such entity. For this
      purpose, "control" means the direct or indirect ownership of fifty percent
      (50%) or more of the outstanding capital stock or other equity interests
      having ordinary voting power.

(2)   "Ancillary Services" has the meaning set forth in the Tolling Agreement.

(3)   "Available Tolling Capability" has the meaning set forth in the Tolling
      Agreement.

(4)   "Authorized Representatives" has the meaning set forth in Section 5.01.

(5)   "Btu" means British thermal unit, which is the quantity of thermal energy
      necessary to increase the temperature of one pound of pure water by one
      degree Fahrenheit from 59 degrees Fahrenheit to 60 degrees Fahrenheit at a
      constant pressure of 14.73 pounds per square inch absolute.

(6)   "Business Day" means any Day on which Federal Reserve member banks in New
      York, New York are open for business.

(7)   "Contract Administration Charge" has the meaning set forth in Section
      3.08.

(8)   "Contract Price" has the meaning set forth in Section 3.02.

(9)   "Contract Price Gas" has the meaning set forth in Section 17.01(a).

(10)  "Contract Term" has the meaning set forth in Section 2.01.

(11)  "Day" has the meaning set forth in the NYISO Requirements.

(12)  "DMT" means Dynegy Marketing and Trade.

(13)  "Eastern Prevailing Time" means local time in New York, New York.

(14)  "Effective Date" has the meaning set forth in Section 2.01.

(15)  "Empire" means Empire State Pipeline.

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(16)  "Empire Gas Transportation Contract" means the Empire Firm Transportation
      Agreement dated October 4, 1993 between Empire, Empire State Pipeline
      Company ("ESPC"), St. Clair Pipeline Company, Inc. ("SCPC") and
      Independence as it incorporates the terms of the Supplemental Agreement
      dated February 28, 1992 among Independence, Empire, SCPC and ESPC.

(17)  "Energy" means electricity (measured in kWh or MWh, as the case may be).

(18)  "Energy Management Agreement" means the Energy Management Agreement dated
      as of July 1, 2001 among Independence, DMT and DPM.

(19)  "Event of Default" has the meaning set forth in Section 12.01.

(20)  "FERC" means the Federal Energy Regulatory Commission.

(21)  "FGP" shall have the meaning set forth in Section 3.02(b).

(22)  "Fixed Price Gas" means, for any period, the sum of (a) all Gas delivered
      by Supplier to Independence at the Gas Facility Point to be utilized for
      purposes of operating all or any portion of the Reserved Tolling
      Capability in order to effectuate a physical hedge against Independence's
      obligations associated with the Market Price, plus (b) for any portion of
      a period in which Independence desires to operate all or any portion of
      the Reserved Tolling Capability in order to effectuate a physical hedge
      against Independence's obligations associated with the Market Price, but
      Independence is unable to do so as a result of the exercise by third
      parties of rights under contracts with Independence, all Gas that would
      have been required to operate such portion of the Reserved Tolling
      Capability.

(23)  "Force Majeure" has the meaning set forth in Article XVI.

(24)  "Gas" means natural gas, including gas-well gas, casinghead gas and/or
      residue gas resulting from processing both casinghead gas and gas-well
      gas, and shall include liquefied natural gas and synthetic gas in a
      vaporized state, in each case meeting or exceeding the minimum quality
      specifications under the Empire Gas Transportation Contract (and related
      Empire Gas tariffs) and the Niagara Mohawk Transportation Contract (and
      related Niagara Mohawk Gas tariffs).

(25)  "Gas Delivery Point" means (a) during periods when Independence has all
      required regulatory authorizations under this Agreement and the Tolling
      Agreement from (i) United States Governmental Authorities to import and
      (ii) their Canadian counterparts to export, Gas from Canada to the United
      States, the Canadian side of the point of interconnection between the
      system of TransCanada Pipelines Limited and the Empire system located near

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      Chippawa,New York, and (b) during periods when Independence does not have
      all such regulatory authorizations from United States Governmental
      Authorities and their Canadian counterparts, the Gas Facility Point.

(26)  "Gas Facility Point" means the outlet flange of the Gas Metering Equipment
      at the interconnection between the Facility and Line 63 of Niagara Mohawk.

(27)  "Gas Index Price" for each day means the midpoint of the common range for
      [***] as reported in the "Daily Gas Survey" for that day in Gas Daily
      (published by Financial Times Energy) (with respect to weekdays for the
      flow date, and with respect to weekend days and holidays for the flow date
      immediately following such weekend day or holiday). If such information is
      no longer published, the Parties shall mutually agree on an appropriate
      replacement index. If, at any time, the Parties mutually agree that the
      specified index no longer provides a reasonable proxy, the Parties shall
      mutually agree on an appropriate replacement index.

(28)  "Gas Metering Equipment" means Gas meters and associated equipment
      specified in the Empire Gas Transportation Contract (and related Empire
      Gas tariffs) and in the Niagara Mohawk Gas Transportation Contract (and
      related Niagara Mohawk Gas tariffs), utilized in determining the amount of
      Gas consumed by the Facility.

(29)  "Governmental Authority" shall mean any federal, state, provincial, local
      or municipal governmental body; any governmental, regulatory or
      administrative agency, commission, body or other authority exercising or
      entitled to exercise any administrative, executive, judicial, legislative,
      policy, regulatory or taxing authority, jurisdiction or power; any court
      or governmental tribunal; or any applicable independent system operator,
      regional transmission organization, regional power pool, reliability
      council or other regional entity performing similar functions.

(30)  "Higher Heating Value" or "HHV" means the total heat content, expressed in
      Btu per cubic foot (Btu/ft^3), produced by the complete combustion of 1
      cubic foot of natural gas at a temperature of 60 degrees Fahrenheit with
      the natural gas free of water vapor and at a pressure of 14.73 pounds per
      square inch absolute with the products of combustion to be cooled to the
      initial temperature of the natural gas and the water formed by the
      combustion reaction condensed to the liquid state.

(31)  "Interest Rate" means, for each Day, a rate per annum equal to the prime
      rate reported in The Wall Street Journal's "Money Rates" column (or any
      similar column published in The Wall Street Journal in replacement
      thereof) for the immediately preceding Business Day plus 2%. In the event
      The Wall Street Journal ceases to report the prime rate, the prime rate
      for purposes of

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      this Agreement shall be the prevailing prime rate (or base rate) charged
      by major banks in the United States of America.

(32)  "kW" means kilowatt.

(33)  "kWh" means kilowatt-hour.

(34)  "Law" means any law, rule, regulation, order, writ, judgment, decree or
      other legal or regulatory determination by a Governmental Authority.

(35)  "Market Price" has the meaning set forth in the Tolling Agreement.

(36)  "MMBtu" means one million Btu.

(37)  "Month" means calendar month.

(38)  "MW" means megawatt.

(39)  "MWh" means megawatt-hour (one MWh equals 1,000 kWh).

(40)  "Niagara Mohawk Gas Transportation Contract" means the Niagara Mohawk Firm
      Transportation Agreement dated March 11, 1992 between Niagara Mohawk and
      Independence.

(41)  "NYISO" means the New York Independent System Operator, Inc.

(42)  "NYISO Bid" means a bid, Schedule (as defined in the Tolling Agreement) or
      request to operate submitted to the NYISO related to the generation of
      Energy or Ancillary Services from the Facility.

(43)  "NYISO Directed Operation" means, for any period, the operation of all or
      a portion of the Facility at the direction of the NYISO during such
      period, including the operation of the Facility in response to an NYISO
      Bid accepted by the NYISO or the operation of the Facility at the
      direction of a Transmission Provider (as defined in the Tolling Agreement)
      pursuant to NYISO Requirements.

(44)  "NYISO Open Access Transmission Tariff" means the ISO Open Access
      Transmission Tariff filed with FERC by the NYISO.

(45)  "NYISO Operating Agreement" means the amended and restated Operating
      Agreement of the NYISO filed with FERC by the NYISO.

(46)  "NYISO Requirements" means the then applicable and valid obligations,
      rules and regulations as defined and set forth in the NYISO Operating
      Agreement, the NYISO Services Tariff, the NYISO Open Access Transmission
      Tariff and/or similar agreements, policies and guidelines.

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(47)  "NYISO Services Tariff" means the NYISO Market Administration and Control
      Area Services Tariff filed with FERC by the NYISO.

(48)  "Outage" has the meaning set forth in the Tolling Agreement.

(49)  "Person" means any individual, corporation, partnership, trust, estate,
      limited liability company, governmental agency or authority or other
      entity.

(50)  "Regular Business Hours" means 9:00 a.m. through 5:00 p.m. Eastern
      Prevailing Time on Business Days.

(51)  "Reserved Capability" has the meaning set forth in the Tolling Agreement.

(52)  "Reserved Tolling Capability" has the meaning set forth in the Tolling
      Agreement.

(53)  "Schedule" or "Scheduling" or "Scheduled" means communicating and
      confirming that a particular amount of Gas is to be delivered or received
      and providing all information as may be necessary to cause such delivery
      or receipt to occur at the Gas Facility Point.

(54)  "Scheduling and Operating Procedures" has the meaning set forth in Section
      5.01.

(55)  "Shutdown" means, with respect to each combustion turbine/generator set,
      the reduction in output to zero necessary as a result of NYISO Directed
      Operation.

(56)  "Start-up" means, with respect to each combustion turbine/generator set,
      the action of bringing such combustion turbine/generator set from a
      non-operating mode to the level of output in combined cycle mode.

(57)  "Taxes" means any and all ad valorem, property, occupation, severance,
      generation, first use, conversion, Btu or Energy, transmission, utility,
      gross receipts, privilege, sales, use, consumption, excise, lease,
      transaction and other taxes, governmental charges, surcharges, licenses,
      fees, permits and assessments or increases therein, and any interest or
      penalties on such taxes, charges, licenses, fees, permits and assessments,
      other than taxes based on net income or net worth.

(58)  "Transporter" means any Person that transports Gas provided under this
      Agreement upstream of the Gas Facility Point.

(59)  "Week" means calendar week.

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                                ARTICLE II - TERM

      2.01 TERM

      This Agreement shall commence on the later of (a) the date on which all
conditions specified in Article XI are satisfied or waived or (b) July 1, 2001
("Effective Date") and shall remain in effect through the November 14, 2014
("Contract Term"); provided, however, that Independence may terminate this
Agreement in its sole discretion at any time prior to 12:01 A.M. on July 1, 2001
by providing notice of termination to Supplier. This Agreement shall terminate
automatically at the end of the Contract Term and neither Independence nor
Supplier shall have any further liability or obligation to the other hereunder,
except for obligations or duties that accrued prior to such termination and for
obligations that expressly survive termination of this Agreement.

                ARTICLE III - GAS SUPPLY AND COST RESPONSIBILITY

      3.01 SUPPLIER'S GAS DELIVERY OBLIGATIONS

      Subject to the procedures specified in the Energy Management Agreement and
in Exhibits 5.02(A) and 5.02(B) to the Tolling Agreement, Supplier shall arrange
for delivery to the Gas Facility Point of all of Independence's requirements for
Gas at the Facility, excluding Gas for which DPM is responsible under the
Tolling Agreement, but including (a) Gas required for Independence to generate
Energy utilizing the Reserved Capability, (b) Gas required for Independence to
operate auxiliary boilers, and (c) Gas Independence is obligated to purchase
pursuant to Sections 5.01, 5.03 and 5.06 of the Tolling Agreement.

      3.02 COST RESPONSIBILITY

            (a) Independence shall purchase all Gas provided pursuant to Section
3.01 (other than Fixed Price Gas) from Supplier at a contract price ("Contract
Price") per MMBtu of Gas equal to the Gas Index Price plus the variable Gas
transportation charges, fuel, applicable Taxes (if any) in accordance with
Section 17.01, shrinkage and loss requirements associated with Supplier's use of
(i) the firm transportation capacity under the Empire Gas Transportation
Agreement and the Niagara Mohawk Gas Transportation Agreement and (ii) firm
transportation capacity on the system of TransCanada Pipelines Limited between
Kirkwall and Chippawa and firm transportation capacity on the system of Union
Gas Limited between Dawn and Kirkwall for Gas provided pursuant to Section 3.01.
Except as specifically provided in this Agreement, Supplier shall be responsible
for all other costs associated with the supply and transportation of Gas under
this Agreement.

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            (b) Independence shall pay Supplier for all Fixed Price Gas provided
during any period pursuant to Section 3.01 at a fixed gas price ("FGP")
calculated as follows (provided, however, that, while Independence shall have an
obligation to pay Supplier for the Fixed Price Gas described in Section
1.02(22)(b), Supplier shall have no obligation to physically deliver such
quantities of Gas to Independence):

            FGP = C x H x (GP/[***] + $[***]/MMBtu) x HR

            C = the average quantity (in MW) of the Reserved Tolling Capability
            (i) operated during such period for purposes of effectuating a
            physical hedge against Independence's financial obligations
            associated with the Market Price or (ii) that Independence desired
            to operate in order to effectuate a physical hedge against
            Independence's obligations associated with the Market Price, but was
            unable to operate as a result of the exercise by third parties of
            rights under contracts with Independence

            H = total hours contained in such period

            GP = the price representing the weighted average of the midpoints
            for each of the days during such period of the common range for
            [***] as reported in the "Daily Gas Survey" in Gas Daily (published
            by Financial Times Energy) (with respect to weekdays for the flow
            date, and with respect to weekend days and holidays for the flow
            date immediately following such weekend day or holiday) expressed in
            $/MMBtu. If such information is no longer published, the Parties
            shall agree upon an appropriate replacement index.

            HR = [***] MMBtu/MWh

      3.03 TRANSPORTATION OBLIGATIONS

      To transport Gas identified in Section 3.01 to the Gas Facility Point,
Independence will make available to Supplier firm transportation capacity (a) on
the Empire system pursuant to the Empire Gas Transportation Contract, and (b) on
the Niagara Mohawk system pursuant to the Niagara Mohawk Gas Transportation
Contract. Independence will pay all demand charges and all surcharges (excluding
all variable charges, which include commodity charges, fuel use and shrinkage)
under both firm transportation agreements. Independence will retain all rights
and obligations for the transportation capacity on the Empire and Niagara Mohawk
systems, except that Independence will take all actions reasonably required to
appoint Supplier as Independence's agent for purposes of nominations and

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scheduling under such firm transportation agreements. Supplier shall pay
directly (if permitted by the applicable Transporter) or reimburse Independence
for all variable charges, including commodity charges, fuel use, shrinkage and
imbalance charges associated with Supplier's use of such firm transportation
capacity. The Parties shall reasonably cooperate in delivering any documentation
necessary to implement this Section 3.03. During the Contract Term, in addition
to other indemnification obligations of Independence set forth elsewhere in this
Agreement, Independence shall indemnify and hold Supplier harmless from and
against any and all liabilities, costs, claims, causes of action, judgments,
lawsuits, or damages that may be incurred by Supplier in connection with the
Empire Gas Transportation Contract and the Niagara Mohawk Gas Transportation
Contract for all periods prior to the Effective Date. During the Contract Term,
in addition to other indemnification obligations of Supplier set forth elsewhere
in this Agreement, Supplier shall indemnify and hold Independence harmless from
and against any and all liabilities, costs, claims, causes of action, judgments,
lawsuits, or damages that may be incurred by Independence in connection with
Supplier's actions as Independence's agent for purposes of nominations and
scheduling under the Empire Gas Transportation Contract and the Niagara Mohawk
Gas Transportation Contract.

      3.04 PIPELINE IMBALANCE CHARGES

            (a) Notwithstanding any other provision contained herein, Supplier
shall be responsible for and pay all pipeline imbalance and similar charges
arising out of or relating to Gas provided under this Agreement on all Gas
transportation facilities upstream of the Gas Facility Point.

            (b) The Parties shall use commercially reasonable efforts to
minimize all such pipeline imbalance charges.

      3.05 SCHEDULING RESPONSIBILITY

      Supplier is responsible for all Scheduling and nomination activities with
the Transporters upstream of the Gas Facility Point.

      3.06 EFFECT OF DELIVERY; INDEMNITY

      Title to all Gas delivered pursuant to Section 3.01 shall pass to
Independence at the Gas Delivery Point. As between the Parties, Supplier shall
be deemed to be in exclusive control and possession of the Gas delivered
hereunder until the same shall have been delivered at the Gas Delivery Point, at
and after which delivery Independence shall be deemed to be in exclusive control
and possession thereof. Supplier and Independence each assumes full
responsibility and liability for and shall indemnify and save harmless the other
Party and its officers, directors,

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employees, agents, and partners from all liability and expense on account of any
and all damages, claims, or actions, including injury to and death of Persons,
arising from any act or accident occurring when title to the Gas is vested in
the indemnifying Party as herein provided.

      3.07 REGULATORY AUTHORIZATIONS

      Supplier shall be responsible for obtaining and maintaining, on behalf of
Independence, all required regulatory authorizations for Independence under this
Agreement and the Tolling Agreement from (i) United States Governmental
Authorities to import and (ii) their Canadian counterparts to export Gas from
Canada to the United States.

      3.08 CONTRACT ADMINISTRATION CHARGE

      Each Month during the Contract Term, Independence shall pay Supplier a
Contract Administration Charge of $[***].

                              ARTICLE IV - QUALITY

      4.01 TRANSPORTER'S SPECIFICATIONS

      Gas delivered by Supplier shall meet or exceed the minimum quality
specifications under the Empire Gas Transportation Contract (and related Empire
Gas tariffs) and the Niagara Mohawk Gas Transportation Contract (and related
Niagara Mohawk Gas tariffs). If any Gas delivered by Supplier shall fail to
conform to such quality specifications, Independence's sole remedy shall be
refusal to accept the tendered quantities, in which event such Gas shall be
treated as if Supplier shall have failed to deliver it; all other Gas shall be
treated as meeting such specifications. Gas delivered by Supplier shall be
delivered at pressures sufficient to cause such Gas to enter Independence's
facilities at the Gas Facility Point, but not below the minimum allowable or
above the maximum allowable operating pressure specified in the Empire Gas
Transportation Contract (and related Empire Gas tariffs) and the Niagara Mohawk
Gas Transportation Contract (and related Niagara Mohawk Gas tariffs).

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                             ARTICLE V - SCHEDULING

      5.01 SCHEDULING AND OPERATING PROCEDURES AND AUTHORIZED REPRESENTATIVES

      Each of Independence and Supplier agree that Gas will be provided only in
accordance with the Energy Management Agreement and Scheduling and Operating
Procedures specified in Exhibits 5.02(A) and 5.02(B) to the Tolling Agreement.
Each Party shall designate in writing to the other Party the persons authorized
to make or provide notices on behalf of such Party in connection with
nominations, schedules or instructions for the delivery or acceptance of Gas or
make other notices on behalf of such Party and specify the scope of their
individual authority and responsibilities ("Authorized Representatives"). Each
Party may change its Authorized Representatives from time to time with a notice
in accordance with this Agreement. Each Party consents to the recording of all
telephone conversations between its Authorized Representatives and the
Authorized Representatives of the other Party with respect to implementation of
this Agreement.

                 ARTICLE VI - NYISO AND REGULATORY REQUIREMENTS

      6.01 REGULATORY REQUIREMENTS

      Supplier shall supply Gas as required for Independence to comply with any
NYISO Directed Operation.

      6.02 AMENDMENT

      This Agreement shall not be amended unless such amendment is in writing
and executed by the Parties. Either Party shall, as and if requested by the
other Party, support this Agreement in filings and with testimony in any
administrative or judicial proceeding relating to or in connection with this
Agreement. In addition to the foregoing, Independence shall keep Supplier
informed as to any material changes in the Empire Gas Transportation Contract
and the Niagara Mohawk Gas Transportation Contract. In addition, Independence
shall permit Supplier to participate in the negotiation of any amendments to
such agreements and in any filings with any Governmental Authority, to the
extent that such amendments or filings could have a material effect on the
arrangements embodied in this Agreement.

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                             ARTICLE VII - METERING

      7.01 METERING

      (a) To the maximum extent possible given the capabilities of the Gas
Metering Equipment, Gas delivered by Supplier to Independence shall be measured
at the Gas Facility Point on a continuous real-time basis. Subject to Section
7.04, the delivering pipeline revenue meter shall be used to determine the
quantity of Gas delivered at the Gas Facility Point.

      (b) Subject to the requirements and limitations of the Niagara Mohawk Gas
Transportation Contract and the Empire Gas Transportation Contract (and related
Gas tariffs), Independence shall be responsible for performing, or causing to be
performed, and shall bear all costs and expenses of the installation,
maintenance, repair, testing and initial calibration of the Gas Metering
Equipment (to the extent not otherwise installed, maintained, tested and
calibrated by the delivery pipeline or supplier of Gas to the Facility).

      (c) Subject to the requirements and limitations of the Niagara Mohawk Gas
Transportation Contract and the Empire Gas Transportation Contract (including
related Gas tariffs), Independence will work with Supplier to permit Supplier,
at Supplier's expense, either to install electronic access to the existing
real-time gas meters, or to install Supplier's own real-time meters.

      7.02 INDUSTRY STANDARDS

      Subject to the requirements and limitations of the Niagara Mohawk Gas
Transportation Contract and the Empire Gas Transportation Contract (including
related Gas tariffs), all Gas Metering Equipment, whether owned by Independence
or by a third party, shall be operated, maintained and tested by and/or on
behalf of Independence in accordance with AGA and ANSI standards.

      7.03 ACCESS

      Subject to the requirements and limitations of the Niagara Mohawk Gas
Transportation Contract and the Empire Gas Transportation Contract (including
related Gas tariffs), each Party shall have the right to receive reasonable
advance notice with respect to, and to be present at the time of, any
installing, cleaning, changing, repairing, inspecting, testing, calibrating or
adjusting of the Gas Metering Equipment irrespective of whether such Gas
Metering Equipment is owned or operated by Independence or by a third party.
Upon reasonable advance notice, Independence shall make available to Supplier
all data, records and charts relating to the Gas Metering Equipment, together
with measurements and calculations therefrom, for inspection and verification.

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      7.04 CALIBRATION

      Subject to the requirements and limitations of the Niagara Mohawk Gas
Transportation Contract and the Empire Gas Transportation Contract (including
related Gas tariffs), Independence at its sole cost and expense shall inspect
and calibrate, or cause to be inspected, all Gas Metering Equipment
periodically, but not less frequently than as required by Niagara Mohawk and
Empire. Subject to the requirements and limitations of the Niagara Mohawk Gas
Transportation Contract and the Empire Gas Transportation Contract (including
related Gas tariffs), correction shall be made when any test shows a measurement
error of more than two percent (2%) or such lower percentage as may be
established by applicable tariff of the delivering pipeline.

      7.05 RECORDS

      The Parties shall maintain accurate and detailed records relating to the
Facility's Gas consumption for three years or for such longer period as may be
required by FERC, the NYISO, Empire or Niagara Mohawk. All records shall be
available for inspection by either Party upon reasonable notice during Regular
Business Hours.

      7.06 UPGRADED METERING

      Notwithstanding any other provision of this Article VII, the Parties
acknowledge that the Gas Metering Equipment may not provide the degree of
precision that the Parties desire regarding the measurement and monitoring of
the Gas input of the Facility, and the Parties agree to work together to develop
plans for upgraded and additional meters. Such plans shall be developed by
mutual agreement of the Parties, and shall be subject to the requirements of the
Niagara Mohawk Gas Transportation Contract and the Empire Gas Transportation
Contract. Independence agrees to bear the reasonable costs of such upgraded
metering.

                       ARTICLE VIII - BILLING AND PAYMENT

      8.01 BILLING

      As soon as practicable after the end of each Month, Supplier shall deliver
to Independence an invoice detailing the Gas delivered to Independence and
setting forth all charges and any other amount payable to Supplier pursuant to
this Agreement, and any amounts payable to Independence pursuant to the terms of
this Agreement.

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      8.02 PAYMENT

      Each Party shall render payment to the other Party by wire transfer
payment, or other acceptable method agreed to by the Parties, of the amount due
as set forth in the invoice, by the later of (i) the twenty fifth (25th) Day of
the Month, and (ii) ten Days after the other Party's receipt of the invoice. The
address, account information and/or wire transfer information shall be as
provided pursuant to Section 18.07. Failure to make such payment when due shall
result in a late charge on the unpaid balance that shall accrue on each calendar
day from the due date to the date paid at the Interest Rate. If either Party in
good faith disputes any part of any invoice, it shall make payment of the
undisputed amount invoiced and shall provide to the other Party on or before the
payment due date a written explanation of the basis for the dispute. If any
amount disputed is determined to be due, the disputing Party shall pay such
disputed amount within two Days of such determination, along with interest
accrued daily at the Interest Rate from the date that, but for the dispute,
payment was due until the date paid.

      8.03 AUDIT

      Each Party has the right with reasonable prior notice, at its sole
expense, to examine the records of the other Party during Regular Business Hours
to the extent reasonably necessary to verify the accuracy of any invoice, or
calculations provided with or supporting such invoice, rendered pursuant to this
Agreement. If any such examination reveals any inaccuracy in any invoice, or
calculations provided with or supporting such invoice, the necessary adjustments
in such invoice, or calculations provided with or supporting such invoice, and
the payments made pursuant to such inaccurate invoice, or calculations provided
with or supporting such invoice, shall be adjusted in the next invoice;
provided, however, that the party asserting the need for such adjustment brought
it to the attention of the other Party within twelve Months after the event
causing the need for adjustment. This Section 8.03 shall survive any termination
of this Agreement for a period of one year from the date on which the last
invoice is rendered to such Party pursuant to this Agreement.

      8.04 OFFSET

      The Parties hereby agree that they shall discharge mutual debts and
payment obligations due and owing to each other under this Agreement through
netting, in which case all amounts owed by each Party to the other Party under
this Agreement during the monthly billing period, including, interest, and
payments or credits, shall be netted so that only the excess amount remaining
due shall be paid by the Party who owes it.

                     ***CONFIDENTIAL TREATMENT REQUESTED***

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                       ARTICLE IX - ADDITIONAL AGREEMENTS

      9.01 INSURANCE

            Each Party shall at all times effect, maintain and keep in force, or
cause to be effected, maintained and kept in force, comprehensive general
liability insurance, public liability coverage and property insurance for
injuries to persons and property, automobile liability insurance and workman's
compensation insurance, all in commercially reasonable amounts and terms. In the
event that a Party reasonably determines that any such policy of insurance is no
longer available at commercially reasonable rates, such Party shall not be
obligated to continue to carry such insurance, and shall obtain substitute
insurance which is as nearly identical as possible to the policy of insurance
which it is intended to replace.

                           ARTICLE X - REPRESENTATIONS

      10.01 INDEPENDENCE'S REPRESENTATIONS

      Independence hereby represents and warrants as follows:

            (a) It is a limited partnership duly organized and validly existing
and in good standing under the laws of Delaware and is duly qualified to do
business and in good standing in the State of New York.

            (b) It has all requisite power and authority to carry on the
business to be conducted by it and to enter into this Agreement and the
transactions contemplated hereby, and perform and carry out all covenants and
obligations on its part to be performed under and pursuant to this Agreement.

            (c) The execution, delivery and performance of this Agreement have
been duly authorized by all necessary action on its part and do not require any
other actions or proceedings or any partnership approval or consent of any
trustee or holder of any indebtedness of Independence.

            (d) This Agreement has been duly executed and delivered on behalf of
Independence by the appropriate officers of the general partner of Independence
and constitutes the legal, valid and binding obligation of Independence,
enforceable against Independence in accordance with its terms, subject to
applicable bankruptcy, insolvency, moratorium and other similar laws applicable
to creditors' rights generally and except as the enforceability thereof may be
limited by general principles of equity (regardless of whether considered in a
proceeding in equity or at law).

                     ***CONFIDENTIAL TREATMENT REQUESTED***

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      10.02 SUPPLIER'S REPRESENTATIONS

      Supplier hereby represents and warrants as follows:

            (a) It is a division of Dynegy Canada Inc., which is duly organized
and validly existing and in good standing under the laws of Alberta.

            (b) It has all requisite power and authority to carry on the
business to be conducted by it and to enter into this Agreement and the
transactions contemplated hereby, and perform and carry out all covenants and
obligations on its part to be performed under and pursuant to this Agreement.

            (c) The execution, delivery and performance of this Agreement have
been duly authorized by all necessary action on its part and do not require any
other actions or proceedings or any corporate approval or consent of any trustee
or holder of any indebtedness of Supplier.

            (d) This Agreement has been duly executed and delivered on behalf of
Supplier by the appropriate officers of Supplier and constitutes the legal,
valid and binding obligation of Supplier, enforceable against Supplier in
accordance with its terms, subject to applicable bankruptcy, insolvency,
moratorium and other similar laws applicable to creditors' rights generally and
except as the enforceability thereof may be limited by general principles of
equity (regardless of whether considered in a proceeding in equity or at law).

            (e) Supplier warrants that it will, at the time of delivery, have
good title to all Gas delivered by it to Independence hereunder, free and clear
of all liens, encumbrances and claims whatsoever.

                             ARTICLE XI - CONDITIONS

      11.01 CONDITIONS PRECEDENT

            The obligations of Independence to consummate the transactions
contemplated by this Agreement shall be subject to fulfillment of the following
conditions, unless waived in writing by Independence:

            (i) Supplier shall have delivered a duly executed Acknowledgement
      and Consent in the form of Exhibit 11.01(A) or such other form as
      Independence may approve;

            (ii) Dynegy Holdings Inc. ("Guarantor") shall have delivered a duly
      executed Guaranty Agreement in the form of Exhibit 11.01(B) or such other
      form as Independence may approve;

                     ***CONFIDENTIAL TREATMENT REQUESTED***

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            (iii) Guarantor shall have delivered a duly executed Acknowledgement
      and Consent in the form of Exhibit 2 to Exhibit 11.01(B) or such other
      form as Independence may approve; and

                       ARTICLE XII - DEFAULT AND REMEDIES

      12.01 EVENTS OF DEFAULT

      The occurrence of any one or more of the following events shall constitute
an Event of Default under this Agreement:

            (a) A material breach of any material term or condition of this
Agreement, including, but not limited, to (i) any material breach of a
representation, warranty or covenant made in this Agreement, and (ii) failure of
either Party to make a required payment to the other Party of amounts due
hereunder.

            (b) A failure of Guarantor to provide Performance Assurance as
defined in the Guaranty Agreement dated as of the date hereof by Guarantor (as
amended, supplemented or modified and in effect from time to time, the "Guaranty
Agreement") or a guaranty or other credit assurance acceptable to Independence,
within the time required pursuant to Section 6 of the Guaranty Agreement.

            (c) A receiver or liquidator or trustee of either Party or of any of
its property shall be appointed by a court of competent jurisdiction, and such
receiver, liquidator or trustee shall not have been discharged within one
hundred twenty (120) Days, or by decree of such a court, a Party shall be
adjudicated bankrupt or insolvent or any substantial part of its property shall
have been sequestered, and such decree shall have continued undischarged and
unstayed for a period of one hundred twenty (120) Days after the entry thereof;
or a petition to declare bankruptcy or to reorganize a Party pursuant to any of
the provisions of the Federal Bankruptcy Code, as now in effect or as it may
hereafter be amended, or pursuant to any other similar state statute as now or
hereafter in effect, shall be filed against a Party and shall not be dismissed
within one hundred twenty (120) Days after such filing.

            (d) A Party shall file a voluntary petition in bankruptcy under any
provision of any federal or state bankruptcy law or shall consent to the filing
of any bankruptcy or reorganization petition against it under any similar law;
or, without limiting the generality of the foregoing, a Party shall file a
petition or answer or consent seeking relief or assisting in seeking relief in a
bankruptcy under any provision of any federal or state bankruptcy law or shall
consent to the filing of any bankruptcy or reorganization petition against it
under any similar law, or, without limiting the generality of the foregoing, a
Party shall file a petition or answer or

                     ***CONFIDENTIAL TREATMENT REQUESTED***

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consent seeking relief or assisting in seeking relief in a proceeding under any
of the provisions of the Federal Bankruptcy Code, as now in effect or as it may
hereafter be amended, or pursuant to any other similar state statute as now or
hereafter in effect, or an answer admitting the material allegations of a
petition filed against it in such a proceeding; or a Party shall make an
assignment for the benefit of its creditors; or a Party shall admit in writing
its inability to pay its debts generally as they become due; or a Party shall
consent to the appointment of a receiver, trustee or liquidator of it or of all
or part of its property.

            (e) The occurrence and continuation of a default, event of default
or other similar condition or event in respect of such Party (or an Affiliate of
such Party) under (i) the Tolling Agreement; or (ii) the Energy Management
Agreement dated as of July 1, 2001 among Independence, DMT and DPM.

      12.02 NOTICE OF DEFAULT; CURE

      Upon the occurrence of any such Event of Default other than those
described in Sections 12.01(b), (c) and (d), the Party not in default shall give
written notice of the Event of Default to the defaulting Party. Such notice of
default shall set forth, in reasonable detail, the nature of the default and,
where known and applicable, the steps necessary to cure such default. Following
receipt of such notice, the defaulting Party shall have:

      (a)   ten (10) Days in the case of the failure of the defaulting Party to
            make a required payment to the other Party of amounts due hereunder;
            or

      (b)   thirty (30) Days in the case of any other Event of Default described
            in Sections 12.01(a) and 12.01(e):

to cure such default or, in the case of an Event of Default under Section
12.02(b), to commence in good faith and continue to diligently pursue all such
steps as shall be reasonably necessary and appropriate to cure such default in
the event such default cannot reasonably be completely cured within such thirty
(30) Day period.

      12.03 REMEDIES

      Notwithstanding the foregoing, after the occurrence of any such Event of
Default and the expiration of all applicable cure periods with respect thereto
without such default being cured, the non-defaulting Party shall be entitled (i)
to suspend performance under this Agreement or to terminate this Agreement, (ii)
to commence an action to require the defaulting Party to remedy such default and
specifically perform its duties and obligations hereunder in accordance with the
terms and conditions hereof and (iii) to exercise such other rights and remedies
as it

                     ***CONFIDENTIAL TREATMENT REQUESTED***

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may have at equity or at law, but subject to any limitation on damages otherwise
provided for under this Agreement.

                     ARTICLE XIII - LIMITATION OF LIABILITY

      13.01 LIMITATION OF LIABILITY

            (a) Subject to Section 13.01(b), neither Party, nor their respective
officers, directors, partners, agents, employees or Affiliates, shall be liable
to the other Party or its Affiliates, officers, directors, trustees, partners,
agents, employees, successors or assigns, for claims for incidental, special,
indirect, consequential or punitive damages of any nature connected with or
resulting from performance or breach of this Agreement, including, without
limitation, claims in the nature of lost revenues, income or profits (other than
payments specifically provided for and properly due under this Agreement) or
losses, damages or liabilities under any financing, lending or construction
contracts, agreements or other arrangements, irrespective of whether such claims
are based upon warranty, negligence, strict liability, contract, operation of
law or otherwise.

            (b) Notwithstanding the limitation of liability under Section
13.01(a), if Supplier fails for any reason (including as a result of Force
Majeure) to deliver Gas to the Gas Facility Point during all or any portion of a
period in which Independence desires to operate any portion of the Reserved
Tolling Capability for purposes of effectuating a physical hedge against its
financial obligations associated with the Market Price (during which such
portion of the Reserved Tolling Capability is otherwise available), Supplier
shall pay to Independence the Market Price for all quantities of Energy that
would have been delivered to the Electric Delivery Point but for the Supplier's
failure to deliver Gas for such period. The Parties acknowledge that damages for
such failure to deliver Gas are difficult or impossible to determine or
otherwise obtaining an adequate remedy is inconvenient and the damages
calculated under this Section 13.01(b) constitute a reasonable approximation of
the harm or loss.

      13.02 DUTY TO MITIGATE

      Notwithstanding any other provision of this Agreement, each Party has a
duty to mitigate damages and covenants that it will use commercially reasonable
efforts to minimize any damages it may incur as a result of the other Party's
performance or non-performance.

                     ***CONFIDENTIAL TREATMENT REQUESTED***

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                          ARTICLE XIV - INDEMNIFICATION

      14.01 INDEPENDENCE'S INDEMNIFICATION

      Independence shall indemnify, defend and hold harmless Supplier and its
Affiliates and their officers, trustees, directors, employees and agents from
and against any and all claims, demands, suits, losses, damages, liabilities,
costs and expenses (including reasonable attorney's fees and costs of
investigation) for damage to the tangible property of third parties and injury
to or death of persons (other than Supplier's employees and Independence's
employees) to the extent caused by, arising out of or relating to the gross
negligence or willful misconduct of Independence in connection with or resulting
from Independence's performance or breach of this Agreement.

      14.02 SUPPLIER'S INDEMNIFICATION

      Supplier shall indemnify, defend and hold harmless Independence and its
Affiliates and their officers, directors, trustees, employees and agents from
and against any and all claims, demands, suits, losses, damages, liabilities,
costs and expenses (including reasonable attorney's fees and costs of
investigation) for damage to tangible property of third parties and injury to or
death of persons (other than Independence's employees or Supplier's employees)
to the extent caused by, arising out of or related to the gross negligence or
willful misconduct of Supplier in connection with or resulting from Supplier's
performance or breach of this Agreement.

      14.03 INDEMNIFICATION PROCEDURES

            (a) A Party which becomes entitled to indemnification under this
Agreement (the "Indemnified Party") shall give written notice to the other Party
(the "Indemnifying Party") of the occurrence of the events which give rise to
such right of indemnification within 30 Days of the Indemnified Party becoming
aware of the occurrence thereof. Such notice shall describe the claim, the basis
thereof and shall indicate an estimate of the amount of the claim. To the extent
that the Indemnifying Party is prejudiced by any failure of the Indemnified
Party to provide such notice, such notice shall be a condition precedent to the
liability of the Indemnifying Party under this Article XIV.

            (b) At the Indemnified Party's request, the Indemnifying Party
shall, at its cost and expense, defend (with counsel reasonably acceptable to
the Indemnified Party) any suit asserting a claim against the Indemnified Party
with respect to which the Indemnified Party is entitled to indemnification
hereunder, and shall pay all costs and expenses incurred by the Indemnified
Party to enforce its right to indemnification. The Indemnified Party may, at its
own expense, retain

                     ***CONFIDENTIAL TREATMENT REQUESTED***

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separate counsel and participate in the defense of any such suit. Neither Party
may settle or compromise a claim or suit without the consent of the Indemnifying
Party, which consent shall not be unreasonably withheld or delayed.

      14.04 SURVIVAL

      The indemnification obligations of each party under this Article XIV shall
not be limited in any way by any limitation on insurance, by the amount or types
of damages, or by any compensation or benefits payable by the parties under
Worker's Compensation Acts, disability benefit acts or other employee acts or
otherwise. The provisions of this Article XIV shall survive termination,
cancellation, suspension, completion or expiration of this Agreement.

                     ARTICLE XV - ASSIGNMENT AND SUCCESSION

      15.01 ASSIGNMENT

            (a) This Agreement and all of the provisions hereof shall be binding
upon, and inure to the benefit of, the Parties hereto and their respective
successors and permitted assigns, but neither this Agreement nor any of the
rights, interests or obligations hereunder shall be assigned, except to an
Affiliate or successor, by either Party hereto, whether by operation of law or
otherwise, without the prior written consent of the other Party, which consent
may not be unreasonably withheld or delayed. No assignment of all or any portion
of the rights, interests or obligations permitted pursuant to the immediately
preceding sentence shall relieve or discharge the assignor from any of its
obligations under this Agreement without the prior written consent of the
non-assigning Party, which consent shall not be unreasonably withheld or
delayed. Any assignment of this Agreement in violation of the foregoing shall
be, at the option of the non-assigning Party, void.

            (b) Notwithstanding the foregoing provisions of Section 15.01(a),
(i) Supplier may assign all or any portion of its rights and obligations
hereunder to any of its Affiliates, (ii) Independence may assign all or any
portion of its rights and obligations hereunder to any of its Affiliates
(including, without limitation, Sithe Power Marketing, L.P., a Delaware limited
partnership), and (iii) Independence may assign, transfer, pledge or otherwise
dispose of its rights and interests hereunder to a trustee or lending
institution for the purposes of financing or refinancing any of its assets,
including upon or pursuant to the exercise of remedies with respect to such
financing or refinancing, or by way of assignments, transfers, pledges or other
dispositions in lieu thereof, provided, however, that no such assignment of all
or any portion of the rights, interests or obligations of a party pursuant to
this Section 15.01(b) shall relieve or discharge the assignor from any of its
obligations under this Agreement unless the non-assigning Party consents to such
release or discharge in accordance with Section 15.01(a). With respect to

                     ***CONFIDENTIAL TREATMENT REQUESTED***

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clause (iii) of this Section 15.01(b), Supplier agrees to execute and deliver
such documents as may be reasonably necessary to accomplish any such assignment,
transfer, pledge or other disposition of rights hereunder, so long as Supplier's
rights under this Agreement are not thereby altered, amended, diminished or
otherwise impaired.

                           ARTICLE XVI - FORCE MAJEURE

      16.01 FORCE MAJEURE

            (a) The term "Force Majeure" shall mean causes beyond the reasonable
control of, and without the fault or negligence of the Party claiming Force
Majeure, including, but not limited to, acts of God; strikes and other labor
disturbances; earthquakes; storms; fires; lightning; epidemics; wars; riots or
civil disturbances; sabotage or condemnation or other similar acts.
Notwithstanding the foregoing, under no circumstances shall Force Majeure
include any of the following: (i) any reduction, curtailment or interruption of
generation or operation of the Facility, whether in whole or in part, which
reduction, curtailment or interruption is caused by or arises from the
negligence or willful misconduct of the affected Party or any third party vendor
or supplier to the Facility of materials, equipment, supplies or services; (ii)
changes in market conditions that affect the cost of or demand for Energy,
Ancillary Services or Gas; (iii) any NYISO or other grid constraint affecting
the transmission of energy by Dynegy Power Marketing from the Electric Delivery
Point; (iv) derating of the Facility, unless such derating is due to a Force
Majeure event; (v) change in Law; (vi) failure of a Party to obtain and maintain
any governmental approval, (vii) any failure or outage of the Facility the cause
of which cannot be determined through reasonable diligence; (viii) any failure
or outage of the Facility that is due to a latent or patent defect or inadequacy
in the generation equipment comprising the Facility; (ix) any failure or outage
of the Facility that is due to the improper or negligent maintenance,
installation, delivery, or design of the Facility; (x) the unavailability of
equipment, goods, or services that could have been avoided by the observance of
Good Electrical Practices or (ix) causes or events affecting the performance of
third-party suppliers of goods or services to the Facility or to Independence
except to the extent caused by an event that otherwise is an event of Force
Majeure as specified in this Section 16.01(a).

            (b) If either Party because of Force Majeure is rendered wholly or
partly unable to perform its obligations under this Agreement, except for a
Party's obligation to make payments under this Agreement (which shall not be
excused), that Party shall be excused from whatever performance is affected by
the Force Majeure to the extent so affected, provided that the Party whose
performance under this Agreement is affected by an event of Force Majeure (i)
gives the other Party notice of the occurrence of such Force Majeure event as
soon as possible, and (ii) uses all commercially reasonable efforts to remedy
the cause(s) and effect(s) of such Force Majeure event with all reasonable
dispatch. The affected Party shall not be

                     ***CONFIDENTIAL TREATMENT REQUESTED***

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obligated to undertake unreasonable or uneconomic costs or burdens, including
the settlement of strikes or labor disturbances on terms other than are
acceptable to such Party in its sole discretion, in order to overcome the
effects of the Force Majeure and reinstate full performance of its Agreement
obligation.

                              ARTICLE XVII - TAXES

      17.01 TAXES AND ADVERSE CLAIMS

            (a) The Contract Price under this Agreement includes full
reimbursement to Supplier for all Taxes applicable to the Gas sold hereunder
(other than Fixed Price Gas) ("Contract Price Gas") upstream of the Gas Facility
Point, including all Taxes applicable to the Contract Price Gas sold hereunder
prior to the Gas Facility Point or applicable as a result of the transfer of
title to the Contract Price Gas sold hereunder, but excluding all Taxes
applicable to the Contract Price Gas sold hereunder downstream of the Gas
Facility Point and except in each case to the extent that the Tax is assessed
due to any subsequent sale by Independence of such Gas. All Taxes incurred in or
attributable to the production, sale, and delivery, handling, or transportation
of the Contract Price Gas sold and delivered under this Agreement (or otherwise
caused by or attributable to such Gas) prior to the Gas Facility Point
(including all Taxes applicable to the Contract Price Gas sold hereunder prior
to the Gas Facility Point or applicable as a result of the transfer of title to
the Contract Price Gas sold hereunder) shall be the responsibility of Supplier
and Supplier shall indemnify, defend, and hold Independence and its officers,
directors, employees, agents, and partners harmless from and against all such
Taxes. Any liability for the New York State Tax on Natural Gas Importers under
ss.189 of the New York Tax Law, or any similar taxes enacted in place of the
Sec. 189 Taxes (together, the "Sec. 189 Taxes"), which are assessed as a result
of the location of any Gas Delivery Point outside of New York State shall be the
responsibility of Supplier and Supplier shall indemnify, defend, and hold
Independence and its officers, directors, employees, agents, and partners
harmless from and against all such Taxes. Except with respect to Sec. 189 Taxes,
all Taxes incurred in or attributable to the purchase and transfer, handling, or
transportation of the Contract Price Gas purchased and received under this
Agreement (or otherwise caused by or attributable to such Gas) after the Gas
Facility Point shall be the responsibility of Independence, and Independence
shall indemnify, defend, and hold Supplier and its officers, directors,
employees, agents, and shareholders harmless from and against all such Taxes.
All sales, transfer, and use Taxes (if any) applicable to the sale or transfer
of Contract Price Gas under this Agreement at the Gas Facility Point shall be
borne 50% each by Independence and Supplier. Each of Supplier and Independence
shall apply for, and shall cooperate with the other in applying for, such
exemption and other certificates as the other reasonably may request to
eliminate the necessity of paying, collecting, or withholding any such Taxes.

                     ***CONFIDENTIAL TREATMENT REQUESTED***

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            (b) The FGP under this Agreement includes full reimbursement to
Supplier for all Taxes applicable to the Fixed Price Gas sold hereunder,
including all Taxes applicable as a result of the transfer of title to the Fixed
Price Gas sold hereunder. All Taxes incurred in or attributable to the
production, sale, and delivery, handling, or transportation of the Fixed Price
Gas sold and delivered under this Agreement (or otherwise caused by or
attributable to such Gas) (including all Taxes applicable as a result of the
transfer of title to the Fixed Price Gas sold hereunder) shall be the
responsibility of Supplier and Supplier shall indemnify, defend, and hold
Independence and its officers, directors, employees, agents, and partners
harmless from and against all such Taxes. All sales, transfer, and use Taxes (if
any) applicable to the sale or transfer of Fixed Price Gas under this Agreement
at the Gas Facility Point shall be borne by Supplier. Each of Supplier and
Independence shall apply for, and shall cooperate with the other in applying
for, such exemption and other certificates as the other reasonably may request
to eliminate the necessity of paying, collecting, or withholding any such Taxes.

            (c) Except for matters addressed in Sections 17.01(a) and 17.01(b),
including the indemnification provided thereunder, Supplier shall indemnify
Independence and its officers, directors, employees, agents, and partners and
save each of them harmless from all suits, actions, debts, accounts, damages,
costs, losses, and expenses (including attorneys' fees and court costs) arising
from or out of or relating to the existence of adverse claims of any or all
persons to Gas delivered under this Agreement and/or any sums paid to Supplier
by Independence pursuant to this Agreement, or royalties, license fees, or
charges thereon that are applicable before title to such Gas passes to
Independence and Taxes (including all production related Taxes) applicable
before the Gas Facility Point.

            (d) The Parties agree to use commercially reasonable efforts to
mitigate the Parties' exposure to Taxes which could be imposed on either Party
as a result of this Agreement.

                          ARTICLE XVIII - MISCELLANEOUS

      18.01 GOVERNING LAW

      This Agreement shall be governed by and construed in accordance with the
law of the State of New York as to all matters (without giving effect to
conflict of law principles). Each of Supplier and Independence hereby
irrevocably waives, to the fullest extent permitted by law, any and all right to
trial by jury in any legal proceedings arising out of or relating to this
Agreement.

      18.02 SUBMISSION TO JURISDICTION

      Each of the Parties hereby irrevocably and unconditionally:

                     ***CONFIDENTIAL TREATMENT REQUESTED***

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            (a) submits for itself and its property in any legal action or
proceeding relating to this Agreement, or for recognition and enforcement of any
judgment in respect thereof, to the non-exclusive general jurisdiction of the
Courts of the State of New York, the courts of the United States for the
Southern District of New York and appellate courts from any thereof;

            (b) agrees that service of process in any such action or proceeding
may be effected by mailing a copy thereof by registered or certified mail (or
any substantially similar form of mail), postage prepaid, to the other Party at
its address set forth in Section 18.07, or at such other address of which the
other Party shall have been notified pursuant thereto; and

            (c) agrees that nothing herein shall affect the right to effect
service of process in any other manner permitted by Law.

      18.03 HEADINGS

      The descriptive headings of the Articles and Sections of this Agreement
are inserted for convenience only and are not intended to affect the meaning,
interpretation or construction of this Agreement.

      18.04 WAIVER

      Except as otherwise provided in this Agreement, any failure of a Party to
comply with any obligation, covenant, agreement or condition herein may be
waived by the Party entitled to the benefits thereof only by a written
instrument signed by the Party granting such waiver, but such waiver shall not
operate as a waiver of, or estoppel with respect to, any subsequent failure of
the first Party to comply with such obligation, covenant, agreement or
condition.

      18.05 SEVERABILITY

      Any provision of this Agreement which is prohibited or unenforceable in
any jurisdiction shall, as to such jurisdiction, be ineffective to the extent of
such prohibition or unenforceability without invalidating the remaining
provisions hereof, and any such prohibition or unenforceability in any
jurisdiction shall not invalidate or render unenforceable such provision in any
other jurisdiction.

      18.06 ENTIRE AGREEMENT

      This Agreement constitutes the entire understanding between the Parties,
and supersedes any and all previous understandings, oral or written, with
respect to the subject matter hereof.

                     ***CONFIDENTIAL TREATMENT REQUESTED***

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      18.07 NOTICES

      Any notice, request, demand, statement or payment provided for in this
Agreement shall be in writing and shall be made as specified below; provided,
however, that notices of interruption may be provided verbally, effective
immediately and confirmed in writing and, provided further, that any Scheduling
shall be done pursuant to the Scheduling and Operating Procedures. Invoices may
be sent by facsimile. A notice sent by facsimile transmission will be recognized
and shall be deemed received on the Business Day on which such notice was
transmitted if received before close of business (and if received after close of
business, on the next Business Day) and a notice by overnight mail or courier
shall be deemed to have been received two Business Days after it was sent or
such earlier time as is confirmed by the receiving Party unless it confirms a
prior verbal communication, in which case any such notice shall be deemed
received on the Day sent.

To Supplier:

NOTICES & CORRESPONDENCE:                PAYMENTS & INVOICES:

Dynegy Canada Marketing and Trade,       All payments made by Independence to
a division of Dynegy Canada Inc.         Supplier (in U.S. funds) shall be made
Suite 805, 1275 North Service Road West  directly to:
Oakville, Ontario
L6M 3G4                                  Intermediary Bank: Bank of America
                                         N.T. and S.A., New York, N.Y.
Attention:  Brian Byers                  ABA Routing Number: 026009593
                                         Account Number: 6550826336
Fax:  905-469-0200
                                         Beneficiary Bank:  The
with a copy to:                          Toronto-Dominion Bank, 340 - 5th
                                         Ave., S.W., Calgary, Alberta
Dynegy Canada Marketing and Trade,       Transit: 80609
a division of Dynegy Canada Inc.         Bank Code: 004
2200, 350 - 7th Avenue SW                Account Name: Dynegy Marketing and
Calgary, Alberta                         Trade, a division of Dynegy Canada Inc.
T2P 3N9                                  Account Number: 731 0127 (US Funds
Attention: Darren Marine                 Only)
                                         EFT Account Number: 0805 731 0127
Fax:  403-213-6044

                     ***CONFIDENTIAL TREATMENT REQUESTED***

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To Independence:

NOTICES & CORRESPONDENCE:           PAYMENTS BY WIRE TRANSFER:

Sithe/Independence Power Partners,  All payments made by Supplier to
L.P.                                Independence shall be made directly to the
P.O. Box 1046                       account entitled "Project Revenue Fund"
76 Independence Way                 maintained by Independence with The Bank of
Oswego, New York 13126              New York, Account No. 229289, 101 Barclay
Attention:  General Manager         Street, Floor 21W, New York, New York,
Facsimile:  (315) 342-8425          10286, or to such other person or account as
                                    shall be specified from time to time by
with a copy to:                     Independence to Supplier in writing. Any
                                    payments being wired to the above-referenced
Sithe/Independence Power Partners,  account should be directed to ABA 021000018;
L.P.                                The Bank of New York; Corporate Trust/GLA
c/o Sithe Energies, Inc.            111-565; for further credit to TAS Account
335 Madison Avenue                  229289; REF: Sithe Independence PWR Project
28th Floor                          Revenue Fund.
New York, New York 10017
Attention:  General Counsel
Facsimile:  (212) 351-0800

From time to time either Party may change the foregoing addresses and payment
information by sending written notice of such change in accordance with this
Section.

      18.08 CONFIDENTIALITY

            (a) "Confidential Information" shall be any information or data
exchanged by the Parties relating to the trading and marketing activities of
either Party or the bids and Schedules (as defined in the Tolling Agreement)
submitted directly or indirectly to the NYISO pursuant to this Agreement
(including non-public information related thereto communicated to a Party from
the NYISO). Confidential Information shall not include information:

                  (i) which was developed by the Receiving Party and was
contained in a writing in the Receiving Party's possession before its receipt
from the other Party;

                  (ii) which at the time of its disclosure to the Receiving
Party is, or thereafter becomes, through no act or failure to act on the part of
the Receiving Party, part of the public domain;

                     ***CONFIDENTIAL TREATMENT REQUESTED***

                                       27
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                  (iii) which has been rightfully furnished to the Receiving
Party by a third party without restriction on disclosure or use and not in
violation of any rights of, or obligations to, the other Party.

      The occurrence of any of the above exceptions shall not be construed as an
express or implied grant of any rights under any of the other Party's patents or
other intellectual property rights. For the purposes of this Section 18.08, a
Party that receives Confidential Information from the other Party shall be
referred to as the "Receiving Party."

            (b) No Receiving Party shall disclose or use Confidential
Information received from the other Party for any purpose other than in
connection with the performance of its obligations under this Agreement, without
the prior written consent of the other Party. The Receiving Party agrees to
utilize with respect to received Confidential Information the same standards and
procedures which it applies to protection of its own confidential information,
but not less than reasonable care.

            (c) Each Party will limit access to received Confidential
Information to those of its owners, affiliates, directors, officers, employees,
attorneys, lenders, contractors, suppliers, agents, and consultants who need to
know about or participate in the performance of its obligations under this
Agreement. Each Party agrees to (i) inform each of its owners, affiliates,
directors, officers, employees, attorneys, lenders, contractors, suppliers,
agents, and consultants who receive Confidential Information of the confidential
nature thereof and of the obligations imposed by this Agreement, and (ii) each
Party shall remain primarily liable to the other for unauthorized use or
disclosure of received Confidential Information by its owners, affiliates,
directors, officers, employees, attorneys, lenders, contractors, suppliers,
agents or consultants receiving such information.

            (d) Each Party may disclose Confidential Information to third
parties or other Governmental Authorities, including NYISO, to the extent such
disclosures are contemplated in and required by the Parties in connection with
the performance of their obligations under this Agreement. Each Party may also
disclose Confidential Information which it is legally required to furnish to
comply with a subpoena or other legal process of a Governmental Authority,
provided that the disclosing Party shall use reasonable efforts to limit such
disclosure and to obtain confidential treatment of such Confidential
Information.

            (e) The provisions of this Section 18.08 shall survive expiration,
cancellation, or termination of this Agreement. Each Party agrees to be bound by
the confidentiality obligations herein for a period of five (5) years from
expiration, cancellation or termination.

                     ***CONFIDENTIAL TREATMENT REQUESTED***

                                       28
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      18.09 COUNTERPARTS

      This Agreement may be executed in counterparts, all of which shall
constitute one and the same Agreement and each of which shall be deemed to be an
original.

      18.10 NO OFFSET

      Except as provided in Section 8.05, the amounts due Supplier from
Independence and the amounts due Independence from Supplier shall constitute
separate and independent obligations and may not be offset or net against each
other or offset or net against any other amounts due between the Parties
(whether under this Agreement or otherwise).

                     ***CONFIDENTIAL TREATMENT REQUESTED***

                                       29
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IN WITNESS WHEREOF, the Parties hereto have caused this Agreement to be executed
as of the date first above written.

                                     SITHE/INDEPENDENCE POWER PARTNERS, L.P.

                                     BY: SITHE/INDEPENDENCE, INC.,
                                         ITS GENERAL PARTNER

                                         By: /s/ Sandra J. Manilla
                                            ------------------------------------
                                         Name:  Sandra J. Manilla
                                         Title:    Vice President and Treasurer

                                     DYNEGY CANADA MARKETING AND TRADE, A
                                     DIVISION OF DYNEGY CANADA INC.

                                     BY: DYNEGY CANADA INC.

                                         By: /s/ Miles Allen
                                            ------------------------------------
                                         Name: Miles Allen
                                         Title: Vice President

                     ***CONFIDENTIAL TREATMENT REQUESTED***

                                       30
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EXHIBIT 11.01(A)

                           ACKNOWLEDGMENT AND CONSENT

      Acknowledgment and Consent (this "CONSENT") dated as of July 1, 2001
between Dynegy Canada Marketing and Trade, a division of Dynegy Canada Inc., an
Alberta corporation (together with its successors and assigns, the "SUPPLIER")
and Sithe/Independence Power Partners, L.P., a Delaware limited partnership
(together with its successors and assigns, the "PARTNERSHIP"), to and for the
benefit of Manufacturers and Traders Trust Company, a New York banking
corporation, in its capacity as collateral agent (together with successors and
assigns in that capacity, the "COLLATERAL AGENT").

      SECTION 1. CONSENT TO ASSIGNMENTS, ETC.

      The Supplier hereby (a) acknowledges that it has been advised of that
certain Security Agreement and Assignment of Contracts dated as of January 1,
1993 (as amended, supplemented or modified and in effect from time to time, the
"SECURITY AGREEMENT") between the Collateral Agent and the Partnership, (b)
consents, subject to the provisions of this Consent, to the collateral
assignment by the Partnership of the GAS SUPPLY AGREEMENT dated as of July 1,
2001 between the Supplier and the Partnership (as amended, supplemented or
modified and in effect from time to time, the "ASSIGNED CONTRACT") as collateral
for the Partnership's obligations to the Secured Parties (as defined in the
Security Agreement), and any subsequent assignments by the Collateral Agent, on
behalf of the Secured Parties, (c) acknowledges the right of the Collateral
Agent, following an Event of Default (as defined in the Security Agreement) by
the Partnership, to make all demands, give all notices, take all actions and
exercise all rights of the Partnership under the Assigned Contract as the
Partnership could have taken absent the Event of Default, and (d) acknowledges
and agrees that the Collateral Agent succeeding to the rights and obligations of
the Partnership under the Assigned Contract shall not, in and of itself,
constitute or cause a default by the Partnership under the Assigned Contract.

      SECTION 2. PAYMENT OF ASSIGNED SUMS

      All payments (if any) to be made by the Supplier to the Partnership under
the Assigned Contract shall be made by wire transfer to the account specified in
Section 24.07 of the Assigned Contract.

      SECTION 3. REPRESENTATIONS OF SUPPLIER

      (a) The Supplier represents and warrants that as of the date hereof:

                     ***CONFIDENTIAL TREATMENT REQUESTED***

                                       31
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            (i) AUTHORIZATION. The execution, delivery and performance by the
Supplier of this Consent has been duly authorized by all necessary action on the
part of the Supplier and does not require any approval or consent of any
[shareholder] of the Supplier or any holder (or any trustee for any holder) of
any indebtedness or other obligation of the Supplier, except as has been
heretofore obtained.

            (ii) EXECUTION; DELIVERY; BINDING AGREEMENT. This Consent has been
duly executed and delivered on behalf of the Supplier by the appropriate
[officers] [representatives] of the Supplier and constitutes the legal, valid
and binding obligation of the Supplier, enforceable against the Supplier in
accordance with its terms, subject to applicable bankruptcy, insolvency,
moratorium and other similar laws applicable to creditors' rights generally and
except as the enforceability thereof may be limited by general principles of
equity (regardless of whether considered in a proceeding in equity or at law).

            (iii) NO DEFAULT OR AMENDMENT. As of the date hereof, neither the
Supplier nor, to the knowledge of the Supplier, the Partnership is in default
under the Assigned Contract. The Supplier has no existing claims, counterclaims,
offsets or defenses against the Partnership in respect of the Assigned Contract
except for routine claims for payment under the Assigned Contract.

      SECTION 4. RIGHTS OF SECURED PARTIES

      The Supplier agrees that, subject to the provisions of this Consent, the
Secured Parties shall have the following rights with respect to the Assigned
Contract:

            (a) Notwithstanding anything to the contrary contained in the
Assigned Contract, the Assigned Contract shall not be terminated or cancelled by
action of the Supplier and shall not be deemed abandoned or surrendered without
prior notice in writing to the Collateral Agent specifying the Partnership's
default (hereinafter called a "NOTICE"). Any such Notice shall contain a copy of
the notice of default sent to the Partnership and shall be delivered to the
Collateral Agent when the Supplier delivers a notice of default to the
Partnership under the Assigned Contract. The Collateral Agent shall have the
right (but not the obligation) to cure the defaults listed in any Notice within
the same period of time provided in the Assigned Contract for the Partnership to
cure such default; PROVIDED, HOWEVER, if the nature of any non-monetary default
on the part of the Partnership under the Assigned Contract is such that it
cannot be cured by the Collateral Agent without the Collateral Agent having
taken possession of the Project (as defined in the Security Agreement), then the
Collateral Agent's time for commencing such cure shall be extended for such
reasonable period of time as is necessary for the Collateral Agent to lawfully
obtain possession of the Project; PROVIDED, FURTHER, that the Collateral Agent
shall at all times be seeking by all reasonable and lawful

                     ***CONFIDENTIAL TREATMENT REQUESTED***

                                       32
<Page>

means to obtain such possession. Once the defaults listed in any Notice are
timely cured by the Collateral Agent, there shall no longer be deemed to be any
default under the Assigned Contract in respect of such defaults so cured. The
curing of any defaults under the Assigned Contract shall not in and of itself be
construed as an assumption by the Collateral Agent or any of the Secured Parties
of any of the obligations, covenants or agreements of the Partnership under the
Assigned Contract.

            (b) If a notice of election is delivered to the Supplier as provided
in Section 5 below, the Supplier will accept performance of the Partnership's
obligations (as specified in such notice of election) under the Assigned
Contracts by the Collateral Agent, or its nominee(s) acting for the Secured
Parties, as the case may be, in lieu of the Partnership's performance of such
obligations.

            (c) Upon any transfer of the Partnership's rights under the Assigned
Contract pursuant to the exercise of the Collateral Agent's rights under this
Consent, the Collateral Agent or any third party to which such rights are
transferred by the Collateral Agent (hereinafter, a "THIRD PARTY TRANSFEREE")
shall, upon the Supplier's reasonable satisfaction with the Collateral Agent's
or such Third Party Transferee's financial condition and subject to all
applicable laws, rules and regulations, succeed to all of the Partnership's
right, title and interest under and in connection with the Assigned Contract and
shall be obligated to perform all of the terms and conditions of the Assigned
Contract, except that the Collateral Agent or any Third Party Transferee shall
not be required to perform or cause to be performed any of the Partnership's
obligations under the Assigned Contract (except for the Partnership's obligation
for the payment of all amounts due and payable to the Supplier under the terms
of the Assigned Contract including any interest applicable thereon) that remain
unperformed at the time that the Collateral Agent or such Third Party Transferee
is transferred such Assigned Contract other than continuing non-monetary
defaults under the Assigned Contract which are capable of performance by the
Collateral Agent or the Third Party Transferee or be liable for any prior act or
omission of the Partnership, and upon the transfer by the Collateral Agent of
its rights and interests and the rights and interests of the Partnership under
the Assigned Contracts to a Third Party Transferee, the Collateral Agent and the
Partnership shall be relieved of all obligations under the Assigned Contract
arising after such transfer.

            (d) In the event that (i) the Assigned Contract is rejected by a
trustee or any person exercising the powers of a trustee in any bankruptcy or
insolvency proceeding applicable to the Partnership or (ii) the Assigned
Contract is terminated as a result of any bankruptcy or insolvency proceeding
applicable to the Partnership, the Supplier shall, subject to all applicable
laws, rules and regulations, execute and deliver to the Collateral Agent and its
designees, successors and assigns a new contract; PROVIDED that the Supplier
shall be required to execute a new contract with the Collateral Agent only if
the Collateral Agent or its designees,

                     ***CONFIDENTIAL TREATMENT REQUESTED***

                                       33
<Page>

successors or assigns shall within ten (10) business days of entering into such
new contract, cure all defaults for failure to pay all amounts due and payable
to the Supplier under the Assigned Contract, including any interest applicable
thereon. The new contract shall, subject to all applicable laws, rules and
regulations, contain the same covenants, agreements, terms, provisions and
limitations as the Assigned Contract (except for any requirements with respect
to past performance which have been fulfilled by the Partnership or the
Collateral Agent or its designees, successors and assigns hereunder).

      SECTION 5. LIABILITY OF SECURED PARTIES

      The Collateral Agent, on behalf of the Secured Parties, and its successors
and assigns, shall have no right or power to enforce the Assigned Contract, and
assumes no duty or obligation thereunder unless and until the Collateral Agent
shall have notified the Supplier that it has elected to exercise its rights and
remedies under the Security Agreement and to substitute itself in the position
of the Partnership under the Assigned Contracts and has agreed in a written
instrument executed by the Collateral Agent to be bound by all terms and
conditions of the Assigned Contract applicable to the Partnership.

      SECTION 6. FURTHER ASSURANCES

      The Supplier hereby agrees to execute and deliver all such instruments and
take all such actions as may be reasonably necessary to effectuate fully the
purposes of this Consent, provided, however, that such further assurances shall
not expand the liability, or obligations arising under this Consent or dilute
any rights or remedies otherwise accruing to Supplier under this Consent.

      SECTION 7. NOTICES

      All notices and other communications hereunder shall be in writing, shall
refer on their face to the Assigned Contract (although failure to so refer shall
not render any such notice or communication ineffective), shall be sent by first
class mail, facsimile, by hand or overnight courier service and shall be
directed:

            (a) if to the Supplier, in accordance with the Assigned Contract;

            (b) if to the Collateral Agent, addressed to:

            Manufacturers and Traders Trust Company
            One M&T Plaza
            Buffalo, New York 14203
            Attention: Corporate Trust Department

                     ***CONFIDENTIAL TREATMENT REQUESTED***

                                       34
<Page>

            (c) if to the Partnership, in accordance with the Assigned Contract;
and

            (d) to such other address as any party may designate by notice to
the other party hereto given pursuant hereto.

      SECTION 8. MISCELLANEOUS

      (a) GOVERNING LAW. This Consent shall be governed by and construed in
accordance with the law of the State of New York as to all matters (without
giving effect to conflict of law principles). Each of the Supplier and the
Partnership hereby irrevocably waives, to the fullest extent permitted by law,
any and all right to trial by jury in any legal proceedings arising out of or
relating to this Consent.

      (b) SUBMISSION TO JURISDICTION. Each of the Parties hereby irrevocably and
unconditionally:

                  (i) submits for itself and its property in any legal action or
proceeding relating to this Consent, or for recognition and enforcement of any
judgment in respect thereof, to the non-exclusive general jurisdiction of the
Courts of the State of New York, the courts of the United States for the
Southern District of New York and appellate courts from any thereof;

                  (ii) agrees that service of process in any such action or
proceeding may be effected by mailing a copy thereof by registered or certified
mail (or any substantially similar form of mail), postage prepaid, to the other
Party at its address set forth in Section 7, or at such other address of which
the other Party shall have been notified pursuant thereto; and

                  (iii) agrees that nothing herein shall affect the right to
effect service of process in any other manner permitted by law.

      (c) HEADINGS. The descriptive headings of the Articles and Sections of
this Consent are inserted for convenience only and are not intended to affect
the meaning, interpretation or construction of this Consent.

      (d) WAIVER. Except as otherwise provided in this Consent, any failure of a
party to comply with any obligation, covenant, agreement or condition herein may
be waived by the party entitled to the benefits thereof only by a written
instrument signed by the party granting such waiver, but such waiver shall not
operate as a waiver of, or estoppel with respect to, any subsequent failure of
the first party to comply with such obligation, covenant, agreement or
condition.

      (e) SEVERABILITY. Any provision of this Consent which is prohibited or
unenforceable in any jurisdiction shall, as to such jurisdiction, be ineffective

                     ***CONFIDENTIAL TREATMENT REQUESTED***

                                       35
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to the extent of such prohibition or unenforceability without invalidating the
remaining provisions hereof, and any such prohibition or unenforceability in any
jurisdiction shall not invalidate or render unenforceable such provision in any
other jurisdiction.

      (f) SUCCESSORS AND ASSIGNS. This Consent shall be binding upon and inure
to the benefit of the Supplier, the Collateral Agent, the Partnership and their
respective permitted successors and assigns.

      (g) COUNTERPARTS. This Consent may be executed in counterparts, all of
which shall constitute one and the same Consent and each of which shall be
deemed to be an original.

                     ***CONFIDENTIAL TREATMENT REQUESTED***

                                       36
<Page>

IN WITNESS WHEREOF, the parties hereto have executed this Consent as of the day
and year first above written.

                                       DYNEGY CANADA MARKETING AND TRADE, a
                                       division of DYNEGY CANADA INC.

                                       By:  DYNEGY CANADA INC.

                                       By:
                                          --------------------------------------
                                       Name:
                                            ------------------------------------
                                       Title:
                                             -----------------------------------

                                       SITHE/INDEPENDENCE POWER PARTNERS, L.P.

                                       By:  SITHE/INDEPENDENCE, INC.,
                                            its General Partner

                                       By:
                                          --------------------------------------
                                       Name:
                                            ------------------------------------
                                       Title:
                                             -----------------------------------

                     ***CONFIDENTIAL TREATMENT REQUESTED***

                                       37
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EXHIBIT 11.01(B)

                               GUARANTY AGREEMENT

      Base Guaranty Agreement (this "Guaranty") dated as of July 1, 2001 is made
and entered into by Dynegy Holdings Inc., a Delaware corporation ("Guarantor"),
to and for the benefit of Sithe/Independence Power Partners, L.P., a Delaware
limited partnership ("Independence"), and its successors and permitted assigns.

                                   WITNESSETH:

      WHEREAS, Independence and Dynegy Canada Marketing and Trade, a division of
Dynegy Canada Inc., an Alberta corporation (together with its successors and
permitted assigns, "Supplier"), have entered into a GAS SUPPLY AGREEMENT dated
as of July 1, 2001 (as amended, supplemented or modified from time to time, the
"Gas Supply Agreement"), a copy of which is attached hereto as Exhibit 1;

      WHEREAS, Supplier is an indirect, wholly owned subsidiary of Guarantor,
and Guarantor will derive substantial benefit from the performance by
Independence of its obligations under the Gas Supply Agreement;

      WHEREAS, it is a condition precedent to Independence's obligations under
the Gas Supply Agreement that this Guaranty be duly executed and delivered to
Independence; and

      WHEREAS, Guarantor is willing to enter into this Guaranty.

      NOW, THEREFORE, in consideration of the foregoing premises and the
representations, warranties, covenants and agreements contained herein, and for
other good and valuable consideration, the receipt and adequacy of which are
hereby acknowledged, and intending to be legally bound, Guarantor hereby
covenants and agrees as follows:

      1. GUARANTY. Subject to the terms hereof, Guarantor hereby irrevocably,
absolutely, and unconditionally guarantees to Independence and its successors
and permitted assigns the due, punctual and full performance and payment of each
and every obligation of Supplier under the Gas Supply Agreement (each such
obligation hereinafter referred to, individually, as a "Guaranteed Obligation"
and, collectively, as the "GUARANTEED OBLIGATIONS") and agrees that, if for any
reason whatsoever Supplier shall fail or be unable duly, punctually and fully to
perform or pay any such Guaranteed Obligation, Guarantor shall forthwith, upon
demand as provided in Section 4 hereof, perform or pay such Guaranteed
Obligation, or cause such Guaranteed Obligation to be performed or paid, without
regard to any exercise or

                     ***CONFIDENTIAL TREATMENT REQUESTED***

                                       38
<Page>

nonexercise by Independence, its successors or permitted assigns of any right,
power or privilege under or in respect of the Gas Supply Agreement or the
Guaranteed Obligations. In connection with the foregoing, Independence
acknowledges that performance of the obligations of Supplier under the Gas
Supply Agreement, to the extent that such performance is for an obligation other
than the payment of money, shall be accomplished by Guarantor causing such
performance to occur through a third party or otherwise by the payment of money.
This Guaranty shall be direct, immediate and primary and shall be a guaranty of
performance and payment and not of collection, and is not conditioned or
contingent upon any attempt to collect from Supplier or upon any other event,
contingency or circumstance whatsoever, except as expressly provided otherwise
herein.

      2. OBLIGATIONS UNCONDITIONAL. Guarantor covenants to and agrees with
Independence and its successors and permitted assigns that, to the fullest
extent permitted by law, its obligations under this Guaranty are irrevocable,
absolute and unconditional, shall remain in full force and effect, and shall not
be impaired or affected by, or be subject to, any reduction, termination or
other impairment by set-off, deduction, counterclaim, recoupment, interruption
or otherwise, and Guarantor shall have no right to terminate this Guaranty or to
be released, relieved or discharged, in whole or in part, from its performance
or payment obligations referred to in this Guaranty for any reason whatsoever
(other than the performance and payment in full of the Guaranteed Obligations),
including (a) any amendment, supplement or modification to, waiver of, consent
to or departure from, or failure to exercise any right, remedy, power or
privilege under or in respect of, the Gas Supply Agreement, the Guaranteed
Obligations or any other agreement or instrument relating thereto, (b) any
insolvency, bankruptcy, reorganization, dissolution or liquidation of, or any
similar occurrence with respect to, or cessation of existence of, or change of
ownership of Supplier, or any rejection of any of the Guaranteed Obligations in
connection with any Proceeding (as defined in Section 3 below) or any
disallowance of all or any portion of any claim by Independence, its successors
or permitted assigns in connection with any Proceeding, (c) any lack of
genuineness, legality, validity, regularity, enforceability or value of the Gas
Supply Agreement, any of the Guaranteed Obligations, or any other agreement or
instrument relating thereto, (d) the failure to create, preserve, validate,
perfect or protect any security interest granted to, or in favor of, any person,
(e) any substitution, modification, exchange, release, settlement or compromise
of any security or collateral for or guaranty of any of the Guaranteed
Obligations or failure to apply such security or collateral or failure to
enforce such guaranty or (f) any other event or circumstance whatsoever that
might otherwise constitute a legal or equitable discharge of a surety or
guarantor (other than the payment in full of the Guaranteed Obligations, and any
defenses that may be available to Supplier under the Gas Supply Agreement), it
being the intent of Guarantor that its obligations under this Guaranty shall be
irrevocable, unconditional and absolute under any and all circumstances, except
as expressly provided herein. This Guaranty and the obligations of Guarantor
hereunder shall

                     ***CONFIDENTIAL TREATMENT REQUESTED***

                                       39
<Page>

continue to be effective or be automatically reinstated, as the case may be, if
at any time any payment by or on behalf of Supplier is rescinded or must
otherwise be restored by Independence, its successors or permitted assigns for
any reason, including, but not limited to, as a result of any Proceeding with
respect to Supplier or any other person, as though such payment had not been
made.

      3. INTEREST. The Guaranteed Obligations shall include, without limitation,
interest accruing as part of the Guaranteed Obligations by the terms thereof
following the commencement by or against Supplier of any case or proceeding
under any law relating to bankruptcy, insolvency, reorganization, winding-up,
liquidation, dissolution or composition or adjustment of debt (hereinafter, a
"PROCEEDING").

      4. DEMAND. If Supplier shall fail or be unable duly, punctually and fully
to perform or pay any Guaranteed Obligation, Independence, its successors or
permitted assigns may at any time prior to the full performance or payment of
such Guaranteed Obligation deliver notice of such failure or inability of
Supplier to perform or pay to Guarantor in writing, which notice shall
reasonably specify the nature of such failure or inability to perform or pay, as
the case may be and, in the case of a failure or inability to pay, the amount
thereof (each such written notice hereinafter a "DEMAND"). Guarantor shall, upon
receipt of a Demand, forthwith perform or pay such Guaranteed Obligation, or
cause such Guaranteed Obligation to be performed or paid in full. Promptly on
request, Guarantor shall reimburse Independence, its successors and permitted
assigns for all costs and expenses (including reasonable attorneys' fees)
incurred in enforcing Independence's, its successors' or permitted assigns'
rights under this Guaranty, but only to the extent that Independence is
successful in enforcing Independence's rights under this Guaranty.

      5. REPRESENTATIONS AND WARRANTIES. Guarantor represents and warrants to
Independence and its successors and permitted assigns that as of the date
hereof:

                  (a) it is a corporation duly organized, validly existing and
            in good standing under the laws of the State of Delaware, it has the
            corporate power and authority to execute, deliver and carry out the
            terms and provisions of this Guaranty;

                  (b) no authorization, approval, consent or order of, or
            registration or filing with, any court or other governmental body
            having jurisdiction over Guarantor is required on the part of
            Guarantor for the execution and delivery of this Guaranty;

                  (c) this Guaranty has been duly executed and delivered by
            Guarantor and constitutes a valid and legally binding agreement of

                     ***CONFIDENTIAL TREATMENT REQUESTED***

                                       40
<Page>

            Guarantor enforceable against Guarantor in accordance with its
            terms, subject, however, to applicable bankruptcy, insolvency,
            reorganization, moratorium or similar laws affecting creditors'
            rights generally and except as the enforceability thereof may be
            limited by general principles of equity (regardless of whether
            considered in a proceeding in equity or at law);

                  (d) the execution, delivery and performance of this Guaranty
            have been duly authorized by all necessary corporate action and do
            not require any other actions or proceedings or any stockholder
            approval or consent of any trustee or holder of any indebtedness of
            Guarantor;

                  (e) the execution, delivery and performance of this Guaranty
            and compliance by Guarantor with the terms hereof (i) will not
            violate any governmental approval or law applicable to it or any of
            its property, (ii) will not violate any provision of its certificate
            of incorporation, bylaws or other governing documents, and (iii)
            will not violate or constitute a default under any agreement or
            instrument to which it is a party or by which it or any of its
            property may be bound, or result in the creation or imposition of
            any lien upon any of its property, which violation, default or lien
            would have a material adverse effect on its ability to perform its
            obligations under this Guaranty;

                  (f) except as disclosed in Guarantor's latest Form 10-K and
            any Form 10-Qs or Form 8-Ks subsequently filed with the Securities
            and Exchange Commission, there are no actions, suits, investigations
            or proceedings against Guarantor by or before any court, arbitrator,
            administrative or regulatory agency, or other governmental authority
            pending, or to its knowledge, threatened against or affecting it,
            its properties, or its assets that, if adversely determined, would
            reasonably be expected to have a material and adverse effect on its
            ability to perform its obligations under this Guaranty; and

                  (g) it directly or indirectly owns all of the issued and
            outstanding shares of each class of capital stock of Supplier.

      6. DOWNGRADE EVENT. If at any time any two of the credit ratings then
assigned to Guarantor's unsecured, senior long-term debt obligations falls below
"Investment Grade" from the Standard & Poor's Rating Group (a division of
McGraw-Hill, Inc.) or its successor ("S&P"),"Investment Grade" from Moody's
Investor Services, Inc. or its successor ("MOODY'S") or "Investment Grade" from
Fitch IBCA, Inc. or its successor ("FITCH") (or if Guarantor is not rated by any
of S&P, Moody's or Fitch), then Independence may require Guarantor to provide
collateral in the form of either a substitute guaranty on terms and conditions
substantially

                     ***CONFIDENTIAL TREATMENT REQUESTED***

                                       41
<Page>

similar to this Guaranty (from a substitute guarantor whose unsecured, senior
long-term debt obligations are rated at least "Investment Grade" from two of
S&P, Moody's and Fitch) or other security reasonably acceptable to Independence
and Supplier ("Performance Assurance") in an amount determined by Independence
in a commercially reasonable manner. The failure of Guarantor to provide such
Performance Assurance or a guaranty or other credit assurance acceptable to
Independence within twenty (20) business days of receipt of notice shall
constitute an Event of Default under the Gas Supply Agreement and Independence
will be entitled to the remedies set forth in the Gas Supply Agreement.

      7. AMENDMENT OF GUARANTY. No term or provision of this Guaranty shall be
amended, modified, altered, waived, supplemented or terminated except in a
writing signed by Guarantor and Independence or Independence's successors and
permitted assigns.

      8. WAIVERS. To the fullest extent permitted by law, and except for the
Demand required pursuant to Section 4 hereof, Guarantor hereby waives (a) all
set-offs, counterclaims, presentments, demands for performance, notices of
nonperformance, protests, notice of any of the matters referred to in Section 2,
notices of protests, notices of dishonor, notice of any waivers or indulgences
or extensions, and notices of every kind that may be required to be given by any
statute or rule of law and notice of acceptance of this Guaranty, (b) diligence,
presentment, and demand of payment, filing of claims with a court in connection
with any Proceeding, protest or notice with respect to the Guaranteed
Obligations and all demands whatsoever; and (c) any requirement that any action
or proceeding be brought against Supplier or any other person, or any
requirement that any person exhaust any right, power or remedy or proceed
against any other person, prior to any action against Guarantor under the terms
hereof. No delay on the part of Independence, its successors or permitted
assigns in the exercise of, or failure to exercise, any right or remedy shall
operate as a waiver thereof, a waiver of any other rights or remedies, or a
release of Guarantor from any obligations hereunder, and no single or partial
exercise by Independence, its successors or permitted assigns of any right or
remedy shall preclude any further exercise thereof or the exercise of any other
right or remedy.

      9. WAIVER OF SUBROGATION. Guarantor hereby agrees that it will not
exercise, and hereby irrevocably, absolutely and unconditionally waives, any
rights of subrogation, contribution, reimbursement, indemnification or other
rights of payment or recovery for any payments made by it hereunder until all
Guaranteed Obligations have been fully paid and performed.

      10. NOTICE. Any Demand, notice, request, instruction, correspondence or
other document to be given hereunder (herein collectively called "Notice") shall
be in writing and delivered personally or mailed by certified mail, postage
prepaid and return receipt requested, or by telecopy, as follows:

                     ***CONFIDENTIAL TREATMENT REQUESTED***

                                       42
<Page>

                  To Independence:

                  Sithe/Independence Power Partners, L.P.
                  P.O. Box 1046
                  76 Independence Way
                  Oswego, New York 13126
                  Attention: General Manager
                  Telecopy: (315) 342-8425

                  with a copy to:

                  Sithe Energies, Inc.
                  28th Floor
                  335 Madison Avenue
                  New York, New York 10017
                  Attention: General Counsel
                  Telecopy: (212) 351-0800

                  To Guarantor:

                  Dynegy Holdings Inc.
                  1000 Louisiana Street, Suite 5800
                  Houston, Texas  77002
                  Attention: Assistant Treasurer
                  Telecopy: (713) 507-6786

Notice given by personal delivery or mail shall be effective upon actual
receipt. Notice given by telefax shall be effective upon actual receipt if
received during the recipient's normal business hours, or at the beginning of
the recipient's next business day after receipt if not received during the
recipient's normal business hours. All Notices by telefax shall be confirmed
promptly after transmission in writing by certified mail or personal delivery.
Any party may change any address to which Notice is to be given to it by giving
notice as provided above of such change of address.

      11. ASSIGNMENT. Guarantor shall have no right, power or authority to
delegate, assign or transfer all or any of its rights or obligations hereunder.
Independence may assign all or any of its rights hereunder to any assignee of
its rights under the Gas Supply Agreement as permitted thereby; provided,
further, that Independence may pledge or assign its interest hereunder to the
lenders of financial parties referred to in Section 21.01 of the Gas Supply
Agreement ("Financial Parties") in connection with any assignment of the Gas
Supply Agreement to the Financial Parties as contemplated by Section 21.01 of
the Gas Supply Agreement. In connection with any such assignment to any
Financial

                     ***CONFIDENTIAL TREATMENT REQUESTED***

                                       43
<Page>

Party, Guarantor agrees to execute and deliver the agreement attached hereto as
Exhibit 2.

      12. MISCELLANEOUS. THIS GUARANTY SHALL BE GOVERNED BY, AND CONSTRUED IN
ACCORDANCE WITH, THE LAW OF THE STATE OF NEW YORK, EXCLUDING CONFLICT-OF-LAWS
RULES. EACH OF GUARANTOR AND INDEPENDENCE HEREBY IRREVOCABLY WAIVES, TO THE
FULLEST EXTENT PERMITTED BY LAW, ANY AND ALL RIGHT TO TRIAL BY JURY IN ANY LEGAL
PROCEEDINGS ARISING OUT OF OR RELATING TO THIS GUARANTY OR ANY OF THE OTHER
AGREEMENTS REFERRED TO HEREIN OR ANY OF THE TRANSACTIONS CONTEMPLATED HEREBY OR
THEREBY. Each of the Parties hereby irrevocably and unconditionally: (i) submits
for itself in any legal action or proceeding relating to this Guaranty, or for
recognition and enforcement of any judgment in respect thereof, to the
non-exclusive general jurisdiction of the Courts of the State of New York, the
courts of the United States for the Southern District of New York and appellate
courts from any thereof; (ii) agrees that service of process in any such action
or proceeding may be effected by mailing a copy thereof by registered or
certified mail (or any substantially similar form of mail), postage prepaid, to
the other Party at its address set forth in Section 10, or at such other address
of which the other Party shall have been notified pursuant thereto; and (iii)
agrees that nothing herein shall affect the right to effect service of process
in any other manner permitted by law. This Guaranty is a continuing guaranty,
shall apply to all Guaranteed Obligations whenever arising, shall be binding
upon Guarantor and its successors and shall inure to the benefit of and be
enforceable by Independence and its successors and permitted assigns. This
Guaranty embodies the entire agreement of Guarantor and Independence and
supersedes all prior agreements and understandings relating to the subject
matter hereof. The headings in this Guaranty are for the purposes of reference
only, and shall not affect the meaning hereof. If any provision of this Guaranty
shall for any reason be held invalid, illegal or unenforceable in any respect,
such invalidity, illegality or unenforceability shall not affect any other
provision of this Guaranty, and this Guaranty shall be construed as if such
invalid, illegal or unenforceable provision had never been contained herein, but
only to the extent of its invalidity, illegality or unenforceability. This
Guaranty may be executed in any number of counterparts, each of which shall be
an original, but all of which together shall constitute one instrument.

                     ***CONFIDENTIAL TREATMENT REQUESTED***

                                       44
<Page>

      IN WITNESS WHEREOF, Guarantor has caused this Guaranty to be executed and
delivered by its duly authorized officer as of the day and year first above
written.

                                             DYNEGY HOLDINGS INC.

                                             By:
                                                ----------------------------
                                             Title:
                                                   -------------------------

ACCEPTED:

SITHE/INDEPENDENCE POWER PARTNERS, L.P.

By: SITHE/INDEPENDENCE, INC.,
    its General Partner

By:
   -------------------------------
Title:
      ----------------------------

                     ***CONFIDENTIAL TREATMENT REQUESTED***

                                       45
<Page>
EXHIBIT 2

                           ACKNOWLEDGMENT AND CONSENT

      Acknowledgment and Consent (this "CONSENT") dated as of July 1, 2001
between Dynegy Holdings Inc. a Texas corporation (together with its successors
and assigns, the "COMPANY") and Sithe/Independence Power Partners, L.P., a
Delaware limited partnership (together with its successors and assigns, the
"PARTNERSHIP"), to and for the benefit of Manufacturers and Traders Trust
Company, a New York banking corporation, in its capacity as collateral agent
(together with successors and assigns in that capacity, the "COLLATERAL AGENT").

      SECTION 1. CONSENT TO ASSIGNMENTS, ETC.

      The Company hereby (a) acknowledges that it has been advised of that
certain Security Agreement and Assignment of Contracts dated as of January 1,
1993 (as amended, supplemented or modified and in effect from time to time, the
"SECURITY AGREEMENT") between the Collateral Agent and the Partnership, (b)
consents, subject to the provisions of this Consent, to the collateral
assignment by the Partnership of the Guaranty Agreement dated as of July 1, 2001
between the Company and the Partnership (as amended, supplemented or modified
and in effect from time to time, the "ASSIGNED CONTRACT") as collateral for the
Partnership's obligations to the Secured Parties (as defined in the Security
Agreement), and any subsequent assignments by the Collateral Agent, on behalf of
the Secured Parties, (c) acknowledges the right of the Collateral Agent,
following an Event of Default (as defined in the Security Agreement) by the
Partnership, to make all demands, give all notices, take all actions and
exercise all rights of the Partnership under the Assigned Contract as the
Partnership could have taken absent the Event of Default, and (d) acknowledges
and agrees that the Collateral Agent succeeding to the rights and obligations of
the Partnership under the Assigned Contract shall not, in and of itself,
constitute or cause a default by the Partnership under the Assigned Contract.

      SECTION 2. PAYMENT OF ASSIGNED SUMS

      All payments (if any) to be made by the Company to the Partnership under
the Assigned Contract shall be made by wire transfer to the account specified in
Section 24.07 of the Assigned Contract.

      SECTION 3. REPRESENTATIONS OF COMPANY

            (a) The Company represents and warrants that as of the date hereof:

                  (i) AUTHORIZATION. The execution, delivery and performance by
the Company of this Consent has been duly authorized by all necessary
action on

                     ***CONFIDENTIAL TREATMENT REQUESTED***

                                       46
<Page>

the part of the Company and does not require any approval or consent of any
shareholder of the Company or any holder (or any trustee for any holder) of any
indebtedness or other obligation of the Company, except as has been heretofore
obtained.

                  (ii) EXECUTION; DELIVERY; BINDING AGREEMENT. This Consent has
been duly executed and delivered on behalf of the Company by the appropriate
officers of the Company and constitutes the legal, valid and binding obligation
of the Company, enforceable against the Company in accordance with its terms,
subject to applicable bankruptcy, insolvency, moratorium and other similar laws
applicable to creditors' rights generally and except as the enforceability
thereof may be limited by general principles of equity (regardless of whether
considered in a proceeding in equity or at law).

                  (iii) NO DEFAULT OR AMENDMENT. As of the date hereof, neither
the Company nor, to the knowledge of the Company, the Partnership is in default
under the Assigned Contract. The Company has no existing claims, counterclaims,
offsets or defenses against the Partnership in respect of the Assigned Contract
except for routine claims for payment under the Assigned Contract.

      SECTION 4. RIGHTS OF SECURED PARTIES

      The Company agrees that, subject to the provisions of this Consent, the
Secured Parties shall have the following rights with respect to the Assigned
Contract:

            (a) Notwithstanding anything to the contrary contained in the
Assigned Contract, the Assigned Contract shall not be terminated or cancelled by
action of the Company and shall not be deemed abandoned or surrendered without
prior notice in writing to the Collateral Agent specifying the Partnership's
default (hereinafter called a "NOTICE"). Any such Notice shall contain a copy of
the notice of default sent to the Partnership and shall be delivered to the
Collateral Agent when the Company delivers a notice of default to the
Partnership under the Assigned Contract. The Collateral Agent shall have the
right (but not the obligation) to cure the defaults listed in any Notice within
the same period of time provided in the Assigned Contract for the Partnership to
cure such default; PROVIDED, HOWEVER, if the nature of any non-monetary default
on the part of the Partnership under the Assigned Contract is such that it
cannot be cured by the Collateral Agent without the Collateral Agent having
taken possession of the Project (as defined in the Security Agreement), then the
Collateral Agent's time for commencing such cure shall be extended for such
reasonable period of time as is necessary for the Collateral Agent to lawfully
obtain possession of the Project; PROVIDED, FURTHER, that the Collateral Agent
shall at all times be seeking by all reasonable and lawful means to obtain such
possession. Once the defaults listed in any Notice are timely cured by the
Collateral Agent, there shall no longer be deemed to be any default

                     ***CONFIDENTIAL TREATMENT REQUESTED***

                                       47
<Page>

under the Assigned Contract in respect of such defaults so cured. The curing of
any defaults under the Assigned Contract shall not in and of itself be construed
as an assumption by the Collateral Agent or any of the Secured Parties of any of
the obligations, covenants or agreements of the Partnership under the Assigned
Contract.

            (b) If a notice of election is delivered to the Company as provided
in Section 5 below, the Company will accept performance of the Partnership's
obligations (as specified in such notice of election) under the Assigned
Contracts by the Collateral Agent, or its nominee(s) acting for the Secured
Parties, as the case may be, in lieu of the Partnership's performance of such
obligations.

            (c) Upon any transfer of the Partnership's rights under the Assigned
Contract pursuant to the exercise of the Collateral Agent's rights under this
Consent, the Collateral Agent or any third party to which such rights are
transferred by the Collateral Agent (hereinafter, a "THIRD PARTY TRANSFEREE")
shall, upon the Company's reasonable satisfaction with the Collateral Agent's or
such Third Party Transferee's financial condition and subject to all applicable
laws, rules and regulations, succeed to all of the Partnership's right, title
and interest under and in connection with the Assigned Contract and shall be
obligated to perform all of the terms and conditions of the Assigned Contract,
except that the Collateral Agent or any Third Party Transferee shall not be
required to perform or cause to be performed any of the Partnership's
obligations under the Assigned Contract (except for the Partnership's obligation
for the payment of all amounts due and payable to the Company under the terms of
the Assigned Contract including any interest applicable thereon) that remain
unperformed at the time that the Collateral Agent or such Third Party Transferee
is transferred such Assigned Contract other than continuing non-monetary
defaults under the Assigned Contract which are capable of performance by the
Collateral Agent or the Third Party Transferee or be liable for any prior act or
omission of the Partnership, and upon the transfer by the Collateral Agent of
its rights and interests and the rights and interests of the Partnership under
the Assigned Contracts to a Third Party Transferee, the Collateral Agent and the
Partnership shall be relieved of all obligations under the Assigned Contract
arising after such transfer.

            (d) In the event that (i) the Assigned Contract is rejected by a
trustee or any person exercising the powers of a trustee in any bankruptcy or
insolvency proceeding applicable to the Partnership or (ii) the Assigned
Contract is terminated as a result of any bankruptcy or insolvency proceeding
applicable to the Partnership, the Company shall, subject to all applicable
laws, rules and regulations, execute and deliver to the Collateral Agent and its
designees, successors and assigns a new contract; PROVIDED that the Company
shall be required to execute a new contract with the Collateral Agent only if
the Collateral Agent or its designees, successors or assigns shall within ten
(10) business days of entering into such new contract, cure all defaults for
failure to pay all amounts due and

                     ***CONFIDENTIAL TREATMENT REQUESTED***

                                       48
<Page>

payable to the Company under the Assigned Contract, including any interest
applicable thereon. The new contract shall, subject to all applicable laws,
rules and regulations, contain the same covenants, agreements, terms, provisions
and limitations as the Assigned Contract (except for any requirements with
respect to past performance which have been fulfilled by the Partnership or the
Collateral Agent or its designees, successors and assigns hereunder).

      SECTION 5. LIABILITY OF SECURED PARTIES

      The Collateral Agent, on behalf of the Secured Parties, and its successors
and assigns, shall have no right or power to enforce the Assigned Contract, and
assumes no duty or obligation thereunder unless and until the Collateral Agent
shall have notified the Company that it has elected to exercise its rights and
remedies under the Security Agreement and to substitute itself in the position
of the Partnership under the Assigned Contracts and has agreed in a written
instrument executed by the Collateral Agent to be bound by all terms and
conditions of the Assigned Contract applicable to the Partnership.

      SECTION 6. FURTHER ASSURANCES

      The Company hereby agrees to execute and deliver all such instruments and
take all such actions as may be reasonably necessary to effectuate fully the
purposes of this Consent, provided, however, that such further assurances shall
not expand the liability, or obligations arising under this Consent or dilute
any rights or remedies otherwise accruing to Company under this Consent.

      SECTION 7. NOTICES

      All notices and other communications hereunder shall be in writing, shall
refer on their face to the Assigned Contract (although failure to so refer shall
not render any such notice or communication ineffective), shall be sent by first
class mail, facsimile, by hand or overnight courier service and shall be
directed:

            (a) if to the Company, in accordance with the Assigned Contract;

            (b) if to the Collateral Agent, addressed to:

                Manufacturers and Traders Trust Company
                One M&T Plaza
                Buffalo, New York 14203
                Attention: Corporate Trust Department

            (c) if to the Partnership, in accordance with the Assigned Contract;
and

                     ***CONFIDENTIAL TREATMENT REQUESTED***

                                       49
<Page>

            (d) to such other address as any party may designate by notice to
the other party hereto given pursuant hereto.

      SECTION 8. MISCELLANEOUS

      (a) GOVERNING LAW. This Consent shall be governed by and construed in
accordance with the law of the State of New York as to all matters (without
giving effect to conflict of law principles). Each of the Company and the
Partnership hereby irrevocably waives, to the fullest extent permitted by law,
any and all right to trial by jury in any legal proceedings arising out of or
relating to this Consent.

      (b) SUBMISSION TO JURISDICTION. Each of the Parties hereby irrevocably and
unconditionally:

            (i) submits for itself and its property in any legal action or
proceeding relating to this Consent, or for recognition and enforcement of any
judgment in respect thereof, to the non-exclusive general jurisdiction of the
Courts of the State of New York, the courts of the United States for the
Southern District of New York and appellate courts from any thereof;

            (ii) agrees that service of process in any such action or proceeding
may be effected by mailing a copy thereof by registered or certified mail (or
any substantially similar form of mail), postage prepaid, to the other Party at
its address set forth in Section 7, or at such other address of which the other
Party shall have been notified pursuant thereto; and

            (iii) agrees that nothing herein shall affect the right to effect
service of process in any other manner permitted by law.

      (c) HEADINGS. The descriptive headings of the Articles and Sections of
this Consent are inserted for convenience only and are not intended to affect
the meaning, interpretation or construction of this Consent.

      (d) WAIVER. Except as otherwise provided in this Consent, any failure of a
party to comply with any obligation, covenant, agreement or condition herein may
be waived by the party entitled to the benefits thereof only by a written
instrument signed by the party granting such waiver, but such waiver shall not
operate as a waiver of, or estoppel with respect to, any subsequent failure of
the first party to comply with such obligation, covenant, agreement or
condition.

      (e) SEVERABILITY. Any provision of this Consent which is prohibited or
unenforceable in any jurisdiction shall, as to such jurisdiction, be ineffective
to the extent of such prohibition or unenforceability without invalidating the
remaining provisions hereof, and any such prohibition or unenforceability in any
jurisdiction shall not invalidate or render unenforceable such provision in any
other jurisdiction.

                     ***CONFIDENTIAL TREATMENT REQUESTED***

                                       50
<Page>

      (f) SUCCESSORS AND ASSIGNS. This Consent shall be binding upon and inure
to the benefit of the Company, the Collateral Agent, the Partnership and their
respective permitted successors and assigns.

      (g) COUNTERPARTS. This Consent may be executed in counterparts, all of
which shall constitute one and the same Consent and each of which shall be
deemed to be an original.

                     ***CONFIDENTIAL TREATMENT REQUESTED***

                                       51
<Page>

            IN WITNESS WHEREOF, the parties hereto have executed this Consent as
of the day and year first above written.

                                       DYNEGY HOLDINGS INC.

                                       By:
                                            ------------------------------------
                                       Name:
                                            ------------------------------------
                                       Title:
                                             -----------------------------------

                                       SITHE/INDEPENDENCE POWER PARTNERS, L.P.

                                       By:  SITHE/INDEPENDENCE, INC.,
                                               its General Partner

                                       By:
                                            ------------------------------------
                                       Name:
                                            ------------------------------------
                                       Title:
                                             -----------------------------------

                     ***CONFIDENTIAL TREATMENT REQUESTED***

                                       52<Page>

                                                                 EXHIBIT 10.8.30

                       ASSIGNMENT AND ASSUMPTION AGREEMENT

      ASSIGNMENT AND ASSUMPTION AGREEMENT, dated as of June 29, 2001 (this
"Assignment Agreement"), by and between Sithe/Independence Power Partners, L.P.,
a Delaware limited partnership ("Assignor") and Enron North America Corp., a
Delaware corporation ("Assignee").

                              W I T N E S S E T H:

      WHEREAS, Assignor and TransCanada Pipelines Limited, an Ontario
corporation ("TransCanada") have entered into those certain agreements relating
to the transportation of natural gas for use at Assignor's gas-fired generating
plant of approximately 1,032 MW net capacity located in the Town of Scriba, New
York (the "Facility"), each as listed on ANNEX A hereto (the "TransCanada Gas
Transportation Agreements");

      WHEREAS, Assignor and Union Gas Limited, an Ontario corporation ("Union,"
and together with TransCanada, the "Gas Transporters") have entered into those
certain agreements relating to the transportation of natural gas for use at the
Facility, each as listed on ANNEX B hereto (the "Union Gas Transportation
Agreements," and together with the TransCanada Gas Transportation Agreements,
the "Gas Transportation Agreements");

      WHEREAS, TransCanada and Union each have procedures whereby a transporter
of natural gas on their respective pipelines may temporarily and/or permanently
assign natural gas transportation capacity to a third party; and

      WHEREAS, Assignor desires to permanently assign and Assignee desires to
permanently assume all of Assignor's right, title and interest in and to, and
Assignor desires to be permanently released from any and all obligations under,
the Gas Transportation Agreements and all of the gas transportation capacity
covered thereby; and until such permanent assignment and assumption and
permanent release are consummated, to temporarily assign and assume such
capacity.

      NOW, THEREFORE, in consideration of the foregoing premises and for
other good and valuable consideration, the receipt and sufficiency of which are
hereby acknowledged, Assignor and Assignee, intending to be legally bound,
hereby agree as follows:

      1. Assignor and Assignee agree, as soon as practicable following the
execution of this Assignment Agreement, to effectuate the permanent
assignment by Assignor to Assignee of all of Assignor's right, title and
interest in and to, and the permanent release of any and all obligations
under, the Gas Transportation Agreements and the gas transportation capacity
(the "Capacity") covered thereby. In furtherance thereof, Assignee agrees to
promptly apply for approval of such assignment and release by the Gas
Transporters pursuant to their respective procedures governing permanent
assignments and permanent releases. Assignor hereby agrees with Assignee to
execute and deliver to the Transporters and/or Assignee, as applicable, such
further documents and instruments, and to take such further actions, as may
be necessary or

<Page>

reasonably requested by the Transporters and/or Assignee to effect such
permanent assignment and permanent release of the Gas Transportation
Agreements to Assignee as contemplated herein. Assignor and Assignee
acknowledge and agree that Assignee shall have primary responsibility for
ensuring compliance with the respective procedures of the Transporters and
for obtaining all third party consents, or other consents required by the
respective procedures of the Transporters, in connection with the permanent
assignment of the Gas Transportation Agreements to Assignee and the permanent
release of Assignor therefrom; PROVIDED that Assignor shall cooperate with
Assignee's efforts hereunder upon Assignee's reasonable request.

      2. Until such time as the permanent assignment and permanent release of
the Gas Transportation Agreements are approved by the respective Gas
Transporters, Assignor shall, if and to the extent permitted by the procedures
of the Gas Transporters governing temporary assignments of Capacity, from time
to time at the request of Assignee and at Assignee's sole expense, temporarily
assign Capacity to Assignee in such amount and for such period as Assignee may
request.

      3. From and after July 1, 2001 (the "Effective Date"), Assignee agrees to
perform all of Assignor's liabilities, responsibilities and obligations under
such Gas Transportation Agreement. Assignee shall, upon receipt of reasonable
documentation substantiating any such claim, promptly reimburse Assignor for any
payments made by Assignor to the Gas Transporter pursuant to such Gas
Transportation Agreement attributable solely to periods on and after the
Effective Date. Assignee agrees that it shall be solely liable for all
liabilities, responsibilities and obligations arising under the Gas
Transportation Agreements for periods on and after the Effective Date.

      4. Assignor agrees that it shall be solely liable for all liabilities,
responsibilities and obligations arising under the Gas Transportation Agreements
for periods prior to the Effective Date. Assignor shall, upon the receipt of
reasonable documentation substantiating any such claim, promptly reimburse
Assignee for any payment made by Assignee to a Transporter pursuant to any of
the Gas Transportation Agreements attributable solely to periods prior to the
Effective Date.

      5. If Assignee receives any refunds or credits under the Gas
Transportation Agreements relating to periods prior to the Effective Date, or if
Assignor receives any refunds or credits under the Gas Transportation Agreements
relating to periods after the Effective Date, Assignee or Assignor, as the case
may be, shall promptly remit such refund or credit to the other party in the
form received.

      6. Assignee shall, except as set forth in Section 7(b) below, and subject
to the procedures set forth in Sections 7(c) and 7(d) below, indemnify,
reimburse, defend, and hold harmless Assignor, its Affiliates and their
respective directors, officers, stockholders, partners, employees, agents,
representatives, successors, permitted transferees and permitted assigns, from
and against all demands, actions or causes of action, assessments, losses,
liabilities, damages, costs and expenses, judgments, claims and tax claims
(including, without limitation, interest, fines, penalties, reasonable legal,
consultants' and experts' fees and expenses) suffered or incurred by Assignor by
reason of or resulting from any imbalance between the amount of

                                       2
<Page>

natural gas exported out of Canada and the amount of natural gas imported into
Canada pursuant to the Gas Transportation Agreements in connection with (i) the
Department of Energy, Office of Fossil Energy Order No. 724 (November 19, 1992);
(ii) the Department of Energy, Office of Fossil Energy Order No. 762 (January
22, 1993), modified by Department of Energy, Office of Fossil Energy Order No.
762-A (December 9, 1994); (iii) the National Energy Board of Canada Order
GOL-13-92 (November 27, 1992), modified by National Energy Board of Canada Order
AO-1-GOL-13-92 (February 1, 1993); and (iv) the National Energy Board of Canada
Order GL-219 (April 29, 1993), modified by National Energy Board of Canada
letter order (December 16, 1994).

      7. (a) Assignor shall, except as set forth in this Section 7, indemnify,
reimburse, defend and hold harmless Assignee, its Affiliates and their
respective directors, officers, stockholders, partners, employees, agents,
representatives, successors, permitted transferees and permitted assigns, from
and against any and all demands, actions or causes of action, assessments,
losses, liabilities, damages, costs and expenses, judgments, claims and tax
claims (including, without limitation, interest, fines, penalties, reasonable
legal, consultants' and experts' fees and expenses) suffered or incurred by
Assignee by reason of or resulting from the inaccuracy or breach of any
representation, warranty or covenant of Assignor contained in this Assignment
Agreement. Assignee shall, except as set forth in this Section 7, indemnify,
reimburse, defend, and hold harmless Assignor, its Affiliates and their
respective directors, officers, stockholders, partners, employees, agents,
representatives, successors, permitted transferees and permitted assigns, from
and against all demands, actions or causes of action, assessments, losses,
liabilities, damages, costs and expenses, judgments, claims and tax claims
(including, without limitation, interest, fines, penalties, reasonable legal,
consultants' and experts' fees and expenses) suffered or incurred by Assignor by
reason of or resulting from the inaccuracy or breach of any of the
representations, warranties or covenants of Assignee contained in this
Assignment Agreement. The indemnity provision contained in this Section 7(a)
shall be the parties' sole remedies as a result of the breach by any party
hereto of any of its representations, warranties, covenants or agreements
contained in this Assignment Agreement.

      (b) No party shall be entitled to recover damages in respect of any claim
for breach of any warranty, representation or covenant or otherwise obtain
reimbursement or restitution more than once in respect of any one such breach or
any fact, event or circumstance or set of facts, events or circumstances.

      (c) If Assignor or Assignee, as the case may be ("Claimant"), has a claim
against the other party hereunder ("Indemnifying Party"), Claimant will transmit
to the Indemnifying Party a written notice with respect to such claim,
specifying the basis therefor; PROVIDED, HOWEVER, that any failure or delay in
providing such notice to the Indemnifying Party will not relieve the
Indemnifying Party of any obligation hereunder except and only to the extent the
Indemnifying Party was actually prejudiced by such delay or failure. The
Indemnifying Party shall within 30 days from its receipt of such notice either
notify Claimant that the Indemnifying Party disputes such claim, or pay the
amounts owing by the Indemnifying Party under such claim in cash. If a claim may
be deemed to involve both a direct claim (and thus subject to the terms of this
Section

                                       3
<Page>

7(c)) and a claim involving a third party (and thus subject to the terms of
Section 7(d)), it will be treated hereunder as a claim involving a third party.

      (d) Promptly after receipt of written notice of a claim involving a third
party, Claimant will give Indemnifying Party written notice of any such claim;
PROVIDED, HOWEVER, that any failure or delay in providing such notice to
Indemnifying Party will not relieve Indemnifying Party of any obligations
hereunder except and only to the extent Indemnifying Party was actually
prejudiced by such delay or failure. Indemnifying Party will have the right to
undertake the defense, compromise or settlement of such claim and Indemnifying
Party will not be liable for the fees or expenses of separate counsel for
Claimant, unless the counsel designated by Indemnifying Party is unable, due to
a conflict (as determined under applicable law, bar rules and regulations and
canons of ethics) arising in connection with representation of Indemnifying
Party and Claimant, to fully represent Claimant with respect to such claim, in
which case Indemnifying Party will be liable for the fees and expenses of one
separate counsel for Claimant. Claimant will use its reasonable efforts to
cooperate fully with respect to the defense of any claim. Unless Indemnifying
Party has delivered to Claimant a written statement in form and substance
acceptable to Claimant acknowledging and confirming that a subject claim is
fully within the scope of indemnification obligations of Indemnifying Party
under this Assignment Agreement, if after the passage of a reasonable period of
time after notice of any claim, Indemnifying Party has not initiated a defense
against such claim, Claimant will have the right to undertake the defense,
compromise or settlement of such claim at any time prior to settlement,
compromise or final determination thereof and any action so taken by Claimant
with regard to such defense, compromise or settlement will be deemed to be
within the protection afforded by this Assignment Agreement; PROVIDED, HOWEVER,
that any settlement of any such claim shall require the prior written consent of
Indemnifying Party, which consent shall not be unreasonably withheld or delayed.
Notwithstanding anything in this Section 7(d) to the contrary, (i) if there is a
reasonable possibility that a claim may materially adversely affect Claimant
other than as a result of money damages or other money payments that are within
the protection afforded by this Assignment Agreement, Claimant will have the
right, at Indemnifying Party's cost and expense, to defend, and, with the
consent of Indemnifying Party (which consent will not be unreasonably withheld
or delayed), to compromise or settle such claim, and (ii) Indemnifying Party
will not settle or compromise any claim or consent to the entry of any judgment
that does not include as an unconditional term thereof the giving by the third
party claimant or plaintiff to Claimant a full, irrevocable and unconditional
release from all liability in respect of such claim.

      8. Assignor and Assignee acknowledge that, in order to induce Assignor to
enter into this Assignment Agreement and to consummate the transactions
contemplated hereby, Enron Corp., an affiliate of Assignee, has executed on the
date hereof a guaranty pursuant to which Enron Corp. shall, among other things,
irrevocably and unconditionally guarantee Assignee's obligations under this
Assignment Agreement.

      9. Assignee, to induce Assignor to enter into this Assignment Agreement,
represents and warrants to Assignor that:

                                       4
<Page>

      (a) AUTHORIZATION AND VALIDITY. This Assignment Agreement and the
transactions contemplated hereby have been duly authorized by it, and this
Assignment Agreement has been duly executed and delivered by it and constitutes
its legal, valid and binding obligation, enforceable against it in accordance
with its terms, subject, however, to applicable bankruptcy, insolvency,
reorganization, moratorium, or similar laws affecting creditors' rights
generally and except as the enforceability thereof may be limited by general
principles of equity (regardless of whether considered in a proceeding in equity
or at law).

      (b) NO VIOLATION. The execution and delivery of this Assignment Agreement
by it and the performance by it of this Assignment Agreement and the
consummation of the transactions contemplated hereby, do not and will not (i)
violate or conflict with any provision of its certificate of incorporation or
by-laws, (ii) violate any existing statute or law or any judgment, decree,
order, regulation or rule of any court or governmental authority applicable to
it, which violation will have a material and adverse effect on its ability to
perform its obligations under this Assignment Agreement or (iii) under existing
law require any consent, approval or authorization of, or designation,
declaration or filing with, any governmental authority on the part of Assignee,
other than as described in this Assignment Agreement.

      (c) LEGAL PROCEEDINGS. There are no judicial or administrative actions,
proceedings, or to its knowledge, investigations (including, without limitation,
bankruptcy, reorganization or insolvency actions, proceedings or investigations)
pending or, to its knowledge, threatened that (i) challenge the validity of this
Assignment Agreement or the transactions contemplated hereby, (ii) seek to
restrain or prevent any action taken or to be taken by it in connection with
this Assignment Agreement or (iii) if adversely determined, would have a
material and adverse effect on its ability to perform its obligations under this
Assignment Agreement.

      10. Assignor, to induce Assignee to enter into this Assignment Agreement,
represents and warrants to Assignee that:

      (a) AUTHORIZATION AND VALIDITY. This Assignment Agreement and the
transactions contemplated hereby have been duly authorized by it, and this
Assignment Agreement has been duly executed and delivered by it and constitutes
its legal, valid and binding obligation, enforceable against it in accordance
with its terms, subject, however, to applicable bankruptcy, insolvency,
reorganization, moratorium, or similar laws affecting creditors' rights
generally and except as the enforceability thereof may be limited by general
principles of equity (regardless of whether considered in a proceeding in equity
or at law).

      (b) NO VIOLATION. The execution and delivery of this Assignment Agreement
by it and the performance by it of this Assignment Agreement and the
consummation of the transactions contemplated hereby, do not and will not (i)
violate or conflict with any provision of its limited partnership agreement,
(ii) violate any existing statute or law or any judgment, decree, order,
regulation or rule of any court or governmental authority applicable to it,
which violation will have a material and adverse effect on its ability to
perform its obligations under this Assignment Agreement or (iii) under existing
law require any consent, approval or authorization

                                       5
<Page>

of, or designation, declaration or filing with, any governmental authority on
the part of Assignor, other than as described in this Assignment Agreement.

      (c) LEGAL PROCEEDINGS. There are no judicial or administrative actions,
proceedings, or to its knowledge, investigations (including, without limitation,
bankruptcy, reorganization or insolvency actions, proceedings or investigations)
pending or, to its knowledge, threatened that (i) challenge the validity of this
Assignment Agreement or the transactions contemplated hereby, (ii) seek to
restrain or prevent any action taken or to be taken by it in connection with
this Assignment Agreement or (iii) if adversely determined, would have a
material and adverse effect on its ability to perform its obligations under this
Assignment Agreement.

      11. (a) This Assignment Agreement and all of the provisions hereof shall
be binding upon, and inure to the benefit of, the parties hereto and their
respective successors and permitted assigns, but neither this Assignment
Agreement nor any of the rights, interests or obligations hereunder shall be
assigned, except to an affiliate or successor, by either party hereto, whether
by operation of law or otherwise, without the prior written consent of the other
party, which consent may not be unreasonably withheld or delayed. No assignment
of all or any portion of the rights, interests or obligations permitted pursuant
to the immediately preceding sentence shall relieve or discharge the assignor
from any of its obligations under this Assignment Agreement without the prior
written consent of the non-assigning party, which consent shall not be
unreasonably withheld or delayed. Any assignment of this Assignment Agreement in
violation of the foregoing shall be, at the option of the non-assigning party,
void.

      (b) Notwithstanding the foregoing provisions of Section 11(a), Assignor
may assign, transfer, pledge or otherwise dispose of its rights and interests
hereunder to a trustee or lending institution for the purposes of financing or
refinancing any of its assets, including upon or pursuant to the exercise of
remedies with respect to such financing or refinancing, or by way of
assignments, transfers, pledges or other dispositions in lieu thereof. Assignee
agrees to execute and deliver such documents as may be reasonably necessary to
accomplish any such assignment, transfer, pledge or other disposition of rights
hereunder, including, without limitation, the Acknowledgement and Consent in the
form attached hereto as ANNEX C, so long as Assignee's rights under this
Assignment Agreement are not thereby altered, amended, diminished or otherwise
impaired.

      12. This Assignment Agreement shall be governed by and construed in
accordance with the law of the State of New York as to all matters (without
giving effect to conflict of law principles other than Section 5-1401 of the New
York General Obligations Law). Each of Assignor and Assignee hereby irrevocably
waives, to the fullest extent permitted by law, any and all right to trial by
jury in any legal proceedings arising out of or relating to this Assignment
Agreement.

      13. Each of Assignee and Assignor hereby irrevocably and unconditionally:

      (a) submits for itself and its property in any legal action or proceeding
relating to this Agreement, or for recognition and enforcement of any judgment
in respect thereof, to the

                                       6
<Page>

non-exclusive general jurisdiction of the courts of the State of New York,
the courts of the United States for the Southern District of New York and
appellate courts from any thereof;

      (b) consents and agrees that any such action or proceeding may be brought
in such courts and waives any objection that it may now or hereafter have to the
venue of any such action or proceeding in any such court or that such action or
proceeding was brought in an inconvenient court and agrees not to plead or claim
the same;

      (c) agrees that service of process in any such action or proceeding may be
effected by mailing a copy thereof by registered or certified mail (or any
substantially similar form of mail), postage prepaid, to the other party at its
address set forth in Section 14, or at such other address of which the other
party shall have been notified pursuant thereto; and

      (d) agrees that nothing herein shall affect the right to effect service of
process in any other manner permitted by law.

      14. Notices required or permitted to be given hereunder shall be in
writing and shall be deemed to be sufficiently given when personally delivered
(including delivery by an express or overnight delivery service), when received
by facsimile transmission or when sent by registered mail, return receipt
requested, addressed:

                  IF TO ASSIGNOR, at:

                  Sithe/Independence Power Partners, L.P.
                  P.O. Box 1046
                  76 Independence Way
                  Oswego, New York 13126
                  Attention:  General Manager
                  Telefax:  (315) 342-8425

                  with a copy to:

                  Sithe Energies, Inc.
                  335 Madison Avenue
                  28th Floor
                  New York, NY 10017
                  Attention:  General Counsel
                  Telefax: (212) 351-0800

                                       7
<Page>

                  if to Assignee, at:

                  Enron North America Corp.
                  1400 Smith Street
                  Houston, Texas 77002
                  Attention: Donna Lowry
                  Telefax: (713) 646-4039

      15. Any provision of this Assignment Agreement held to be invalid, illegal
or unenforceable in any jurisdiction shall, as to such jurisdiction, be
ineffective to the extent of such invalidity, illegality or unenforceability
without affecting the validity, legality and enforceability of the remaining
provisions hereof. The invalidity of a particular provision in a particular
jurisdiction shall not invalidate such provision in any other jurisdiction.

      16. This Assignment Agreement may be executed in one or more counterparts,
each of which shall be deemed an original but all of which together shall
constitute one and the same instrument.

      17. This Agreement shall be effective as of 8:00 a.m. (Central time) on
June 29, 2001.

                                       8
<Page>

      IN WITNESS WHEREOF, the undersigned have executed this Assignment
Agreement as of the date first above written.

                               SITHE/INDEPENDENCE POWER PARTNERS, L.P.

                               By:    SITHE/INDEPENDENCE, INC., as its
                                        sole general partner

                               By:    /s/ Martin B. Rosenberg
                                     -----------------------------------
                               Name:   Martin B. Rosenberg
                               Title:  Senior Vice President

                               ENRON NORTH AMERICA CORP.

                               By:    /s/ Jeffrey M. Donahue
                                     -----------------------------------
                               Name:  Jeffrey M. Donahue
                               Title: Managing Director

                                       9
<Page>

                                     ANNEX A

                    TRANSCANADA GAS TRANSPORTATION AGREEMENTS

1.    Firm Service Contract for Firm Transportation Service (Kirkwall/Chippawa)
      dated March 9, 1994, between Sithe/Independence Power Partners, L.P. and
      TransCanada Pipelines Limited, as amended or supplemented from time to
      time.

2.    Firm Service Contract for Firm Transportation Service (St. Clair/Dawn),
      dated March 9, 1994 between Sithe/Independence Power Partners, L.P. and
      TransCanada Pipelines Limited, as amended pursuant to the Amending
      Agreement dated May 1, 1995 between Sithe/Independence Power Partners,
      L.P. and TransCanada Pipelines Limited, and as further amended by the
      Amending Agreement dated June 5, 1996 between Sithe/Independence Power
      Partners, L.P. and TransCanada Pipelines Limited.

3.    Agreement for Disaggregation dated November 6, 1992, between
      Sithe/Independence Power Partners, L.P. and TransCanada Pipelines Limited,
      as amended or supplemented from time to time.

4.    Performance Agreement on Financial Assurances (St. Clair), dated November
      6, 1992, among Sithe/Independence Power Partners, L.P., TransCanada
      Pipelines Limited, Enron North America Corp. (as successor by interest in
      merger to Enron Power Services, Inc.) and Enron Corp.

5.    Assignment Agreement, dated March 9, 1994, among Sithe/Independence Power
      Partners, L.P., TransCanada Pipelines Limited (f/k/a St. Clair Pipelines
      Ltd.) and Union Gas Limited.

6.    Performance Agreement on Financial Assurances (Kirkwall), dated November
      6, 1992, among Sithe/Independence Power Partners, L.P., TransCanada
      Pipelines Limited, Enron North America Corp. (as successor by interest in
      merger to Enron Power Services, Inc.) and Enron Corp.

                                       1
<Page>

                                     ANNEX B

                       UNION GAS TRANSPORTATION AGREEMENTS

1.    M12 Firm Transportation Contract (M12017), dated April 10, 1992, between
      Union Gas Limited and Sithe/Independence Power Partners, L.P., as amended
      by the Amending Agreement for M12 Firm Transportation Contract (No.
      M12017) dated February 19, 1993 between Union Gas Limited and
      Sithe/Independence Power Partners, L.P.

2.    C-1 Firm Transportation Contract (C10018), dated April 10, 1992, between
      Union Gas Limited and Sithe/Independence Power Partners, L.P.

                                       1
<Page>

                                     ANNEX C

                           ACKNOWLEDGEMENT AND CONSENT

      Acknowledgment and Consent (this "Consent") dated as of June 29, 2001
between Enron North America Corp., a Delaware corporation (together with its
successors and assigns, the "Company") and Sithe/Independence Power Partners,
L.P., a Delaware limited partnership (together with its successors and assigns,
the "Partnership"), to and for the benefit of Manufacturers and Traders Trust
Company, a New York banking corporation, in its capacity as collateral agent
(together with its successors and assigns in that capacity, the "Collateral
Agent").

      SECTION 1. CONSENT TO ASSIGNMENTS, ETC.

      The Company hereby (a) acknowledges that it has been advised of that
certain Security Agreement and Assignment of Contracts dated as of January 1,
1993 (as amended, supplemented or modified and in effect from time to time, the
"Security Agreement") between the Collateral Agent and the Partnership, (b)
consents, subject to the provisions of this Consent, to the collateral
assignment by the Partnership of the Assignment and Assumption Agreement dated
as of June 29, 2001 between the Company and the Partnership (as amended,
supplemented or modified and in effect from time to time, the "Assigned
Contract") as collateral for the Partnership's obligations to the Secured
Parties (as defined in the Security Agreement), and any subsequent assignments
by the Collateral Agent, on behalf of the Secured Parties, (c) acknowledges the
right of the Collateral Agent, following an Event of Default (as defined in the
Security Agreement) by the Partnership, to make all demands, give all notices,
take all actions and exercise all rights of the Partnership under the Assigned
Contract, and (d) acknowledges and agrees that the Collateral Agent succeeding
to the rights and obligations of the Partnership under the Assigned Contract
shall not, in and of itself, constitute or cause a default by the Partnership
under the Assigned Contract.

      SECTION 2. PAYMENT OF ASSIGNED SUMS

      All payments (if any) to be made by the Company to the Partnership under
the Assigned Contract shall be made by wire transfer to the account entitled
"Project Revenue Fund" maintained by the Partnership with The Bank of New York,
Account No. 229289, 101 Barclay Street, Floor 21W, New York, New York, 10286, or
to such other person or account as shall be specified from time to time by the
Partnership to the Company in writing. Any payments being wired to the
above-referenced account should be directed to ABA 021000018; The Bank of New
York; Corporate Trust/GLA 111-565; for further credit to TAS Account 229289;
REF: Sithe Independence PWR Project Revenue Fund.

      SECTION 3. REPRESENTATIONS OF COMPANY

      (a) The Company represents and warrants that as of the date hereof:

                                       1
<Page>

                  (i) AUTHORIZATION. The execution, delivery and performance by
the Company of this Consent has been duly authorized by all necessary action on
the part of the Company and does not require any approval or consent of any
shareholder of the Company or any holder (or any trustee for any holder) of any
indebtedness or other obligation of the Company, except as has been heretofore
obtained.

                  (ii) EXECUTION; DELIVERY; BINDING AGREEMENT. This Consent has
been duly executed and delivered on behalf of the Company by the appropriate
officers of the Company and constitutes the legal, valid and binding obligation
of the Company, enforceable against the Company in accordance with its terms,
subject to applicable bankruptcy, insolvency, moratorium and other similar laws
applicable to creditors' rights generally and except as the enforceability
thereof may be limited by general principles of equity (regardless of whether
considered in a proceeding in equity or at law).

                  (iii) NO DEFAULT OR AMENDMENT. As of the date hereof, neither
the Company nor, to the knowledge of the Company, the Partnership is in default
under the Assigned Contract. The Company has no existing claims, counterclaims,
offsets or defenses against the Partnership in respect of the Assigned Contract
except for routine claims for payment under the Assigned Contract.

      SECTION 4. RIGHTS OF SECURED PARTIES

      The Company agrees that, subject to the provisions of this Consent, the
Secured Parties shall have the following rights with respect to the Assigned
Contract:

      (a) Notwithstanding anything to the contrary contained in the Assigned
Contract, the Assigned Contract shall not be terminated or cancelled by action
of the Company and shall not be deemed abandoned or surrendered without prior
notice in writing to the Collateral Agent specifying the Partnership's default
(hereinafter called a "Notice"). Any such Notice shall contain a copy of the
notice of default sent to the Partnership and shall be delivered to the
Collateral Agent when the Company delivers a notice of default to the
Partnership under the Assigned Contract. The Collateral Agent shall have the
right (but not the obligation) to cure the defaults listed in any Notice within
the same period of time provided in the Assigned Contract for the Partnership to
cure such default; provided, however, if the nature of any non-monetary default
on the part of the Partnership under the Assigned Contract is such that it
cannot be cured by the Collateral Agent without the Collateral Agent having
taken possession of the Project (as defined in the Security Agreement), then the
Collateral Agent's time for commencing such cure shall be extended for such
reasonable period of time as is necessary for the Collateral Agent to lawfully
obtain possession of the Project; provided, further, that the Collateral Agent
shall at all times be seeking by all reasonable and lawful means to obtain such
possession. Once the defaults listed in any Notice are timely cured by the
Collateral Agent, there shall no longer be deemed to be any default under the
Assigned Contract in respect of such defaults so cured. The curing of any
defaults under the Assigned Contract shall not in and of itself be construed as
an assumption by the Collateral Agent or any of the Secured Parties of any of
the obligations, covenants or agreements of the Partnership under the Assigned
Contract.

                                       2
<Page>

      (b) If a notice of election is delivered to the Company as provided in
Section 5 below, the Company will accept performance of the Partnership's
obligations (as specified in such notice of election) under the Assigned
Contracts by the Collateral Agent, or its nominee(s) acting for the Secured
Parties, as the case may be, in lieu of the Partnership's performance of such
obligations.

      (c) Upon any transfer of the Partnership's rights under the Assigned
Contract pursuant to the exercise of the Collateral Agent's rights under this
Consent, the Collateral Agent or any third party to which such rights are
transferred by the Collateral Agent (hereinafter, a "Third Party Transferee")
shall, upon the Company's reasonable satisfaction with the Collateral Agent's or
such Third Party Transferee's financial condition and subject to all applicable
laws, rules and regulations, succeed to all of the Partnership's right, title
and interest under and in connection with the Assigned Contract and shall be
obligated to perform all of the terms and conditions of the Assigned Contract,
except that the Collateral Agent or any Third Party Transferee shall not be
required to perform or cause to be performed any of the Partnership's
obligations under the Assigned Contract (except for the Partnership's obligation
for the payment of all amounts due and payable to the Company under the terms of
the Assigned Contract including any interest applicable thereon) that remain
unperformed at the time that the Collateral Agent or such Third Party Transferee
is transferred such Assigned Contract other than continuing non-monetary
defaults under the Assigned Contract which are capable of performance by the
Collateral Agent or the Third Party Transferee or be liable for any prior act or
omission of the Partnership, and upon the transfer by the Collateral Agent of
its rights and interests and the rights and interests of the Partnership under
the Assigned Contracts to a Third Party Transferee, the Collateral Agent and the
Partnership shall be relieved of all obligations under the Assigned Contract
arising after such transfer.

      (d) In the event that (i) the Assigned Contract is rejected by a trustee
or any person exercising the powers of a trustee in any bankruptcy or insolvency
proceeding applicable to the Partnership or (ii) the Assigned Contract is
terminated as a result of any bankruptcy or insolvency proceeding applicable to
the Partnership, the Company shall, subject to all applicable laws, rules and
regulations, execute and deliver to the Collateral Agent and its designees,
successors and assigns a new contract; provided that the Company shall be
required to execute a new contract with the Collateral Agent only if the
Collateral Agent or its designees, successors or assigns shall within ten (10)
business days of entering into such new contract, cure all defaults for failure
to pay all amounts due and payable to the Company under the Assigned Contract,
including any interest applicable thereon. The new contract shall, subject to
all applicable laws, rules and regulations, contain the same covenants,
agreements, terms, provisions and limitations as the Assigned Contract (except
for any requirements with respect to past performance which have been fulfilled
by the Partnership or the Collateral Agent or its designees, successors and
assigns hereunder).

      SECTION 5. LIABILITY OF SECURED PARTIES

                                       3
<Page>

      The Collateral Agent, on behalf of the Secured Parties, and its successors
and assigns, shall have no right or power to enforce the Assigned Contract, and
assumes no duty or obligation thereunder unless and until the Collateral Agent
shall have notified the Company that it has elected to exercise its rights and
remedies under the Security Agreement and to substitute itself in the position
of the Partnership under the Assigned Contracts and has agreed in a written
instrument executed by the Collateral Agent to be bound by all terms and
conditions of the Assigned Contract applicable to the Partnership.

      SECTION 6. FURTHER ASSURANCES

      The Company hereby agrees to execute and deliver all such instruments and
take all such actions as may be reasonably necessary to effectuate fully the
purposes of this Consent.

      SECTION 7. NOTICES

      All notices and other communications hereunder shall be in writing, shall
refer on their face to the Assigned Contract (although failure to so refer shall
not render any such notice or communication ineffective), shall be sent by first
class mail, facsimile, by hand or overnight courier service and shall be
directed:

      (a) if to the Company, in accordance with the Assigned Contract;

      (b) if to the Collateral Agent, addressed to:

                           Manufacturers and Traders Trust Company
                           One M&T Plaza
                           Buffalo, New York 14203
                           Attention: Corporate Trust Department

      (c) if to the Partnership, in accordance with the Assigned Contract; and

      (d) to such other address as any party may designate by notice to the
other party hereto given pursuant hereto.

      SECTION 8. TERMINATION

      Notwithstanding anything in this Consent to the contrary, this Consent
shall terminate upon the earlier of (a) the termination of the Security
Agreement and (b) the date Assignor is fully released (pursuant to an instrument
reasonably satisfactory to the Partnership) from all liability under all of the
Gas Transportation Agreements (as defined in the Assigned Contract).

      SECTION 9. MISCELLANEOUS

      (a) GOVERNING LAW. This Consent shall be governed by and construed in
accordance with the law of the State of New York as to all matters (without
giving effect to conflict of law

                                       4
<Page>

principles other than Section 5-1401 of the New York General Obligations Law).
Each of the Company and the Partnership hereby irrevocably waives, to the
fullest extent permitted by law, any and all right to trial by jury in any legal
proceedings arising out of or relating to this Consent.

      (b) SUBMISSION TO JURISDICTION. Each of the Parties hereby irrevocably and
unconditionally:

                  (i) submits for itself and its property in any legal action or
proceeding relating to this Consent, or for recognition and enforcement of any
judgment in respect thereof, to the non-exclusive general jurisdiction of the
courts of the State of New York, the courts of the United States for the
Southern District of New York and appellate courts from any thereof;

                  (ii) consents and agrees that any such action or proceeding
may be brought in such courts and waives any objection that it may now or
hereafter have to the venue of any such action or proceeding in any such court
or that such action or proceeding was brought in an inconvenient court and
agrees not to plead or claim the same;

                  (iii) agrees that service of process in any such action or
proceeding may be effected by mailing a copy thereof by registered or certified
mail (or any substantially similar form of mail), postage prepaid, to the other
Party at its address set forth in Section 7, or at such other address of which
the other Party shall have been notified pursuant thereto; and

                  (iv) agrees that nothing herein shall affect the right to
effect service of process in any other manner permitted by law.

      (c) HEADINGS. The descriptive headings of the Articles and Sections of
this Consent are inserted for convenience only and are not intended to affect
the meaning, interpretation or construction of this Consent.

      (d) WAIVER. Except as otherwise provided in this Consent, any failure of a
party to comply with any obligation, covenant, agreement or condition herein may
be waived by the party entitled to the benefits thereof only by a written
instrument signed by the party granting such waiver, but such waiver shall not
operate as a waiver of, or estoppel with respect to, any subsequent failure of
the first party to comply with such obligation, covenant, agreement or
condition.

      (e) SEVERABILITY. Any provision of this Consent which is prohibited or
unenforceable in any jurisdiction shall, as to such jurisdiction, be ineffective
to the extent of such prohibition or unenforceability without invalidating the
remaining provisions hereof, and any such prohibition or unenforceability in any
jurisdiction shall not invalidate or render unenforceable such provision in any
other jurisdiction.

      (f) SUCCESSORS AND ASSIGNS. This Consent shall be binding upon and inure
to the benefit of the Company, the Collateral Agent, the Partnership and their
respective permitted successors and assigns.

                                       5
<Page>

      (g) COUNTERPARTS. This Consent may be executed in counterparts, all of
which shall constitute one and the same Consent and each of which shall be
deemed to be an original.

      (h) EFFECTIVE TIME. This Agreement shall be effective as of 8:00 a.m.
(Central time) on June 29, 2001.

                            [Signature page follows]

                                       6
<Page>

      IN WITNESS WHEREOF, the parties hereto have executed this Consent as of
the day and year first above written.

                                ENRON NORTH AMERICA CORP.

                                By:
                                    ----------------------------
                                Name:  Jeffrey M. Donahue
                                Title: Managing Director

                                SITHE/INDEPENDENCE POWER PARTNERS, L.P.

                                By:  SITHE/INDEPENDENCE, INC.,
                                        its General Partner

                                By:
                                    ----------------------------
                                Name:  Martin B. Rosenberg
                                Title: Senior Vice President

                                       7

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