Document:

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                                                                   EXHIBIT 10.37

                               GAS SALES AGREEMENT

This Agreement is made this 15th of November, 1998, between Midland Cogeneration
Venture Limited Partnership ("MCV" or "Buyer") and Engage Energy U.S., L.P.
("Seller") for the purpose of entering into a long-term gas supply arrangement
on the terms and conditions which follow. In this Agreement, Seller and Buyer
may also be referred to individually as "Party" or collectively as "Parties."

1.   Definitions. The following terms when used in this Agreement, shall have
     the following meanings:

     a)   The term "Agreement" means this Agreement and all Exhibits hereto.
     b)   The term "business day" shall mean: any day other than a day on which
          banks in Michigan are allowed by law to be closed.
     c)   The term "Btu" shall mean one (1) British Thermal Unit, the amount of
          heat required to raise the temperature of one (1) pound of water one
          (1) degree Fahrenheit at sixty (60) degrees Fahrenheit. BTU is
          measured on a dry basis.
     d)   The term "Contract Year" shall mean any calendar year during the term
          of this Agreement.
     e)   The term "cubic foot of gas" shall mean the volume of gas contained in
          one (1) cubic foot of space at a pressure of fourteen

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          and seventy-three hundredths (14.73) dry psia, at a temperature of
          sixty degrees (60 degrees) Fahrenheit.
     f)   The term "day" shall mean a period of twenty-four (24) consecutive
          hours (23 hours when changing from Standard to Daylight time and 25
          hours when changing back to Standard time), beginning and ending at
          9:00 a.m. Central clock time.
     g)   The term "Disputed Amount" shall have the meaning set forth in Section
          5A(ii).
     h)   The term "gas" shall mean any mixture of hydrocarbon and
          non-combustible gases in a gaseous form, consisting primarily of
          methane, and includes natural gas produced from gas wells (gas well
          gas), gas which immediately prior to being produced from a reservoir
          is in solution with crude oil, or dispersed in an intimate association
          with crude oil, or in contract with crude oil across a gas-oil contact
          (casinghead gas), or residue gas resulting from the processing of
          either or both casinghead gas and gas well gas.
     i)   The term "Mcf" shall mean one thousand (1,000) cubic feet of gas.
     j)   The term "MMBtu" shall mean a quantity of gas equal to one million
          (1,000,000) Btu which is equivalent to one (1) dekatherm.
     k)   The term "month" shall mean the period beginning at 9 a.m. Central
          clock time on the first day of any calendar month and ending at 9 a.m.
          Central clock time on the first day of the next succeeding calendar
          month.
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     l)   The term "Point of Delivery" shall mean the point where Seller
          delivers gas to Buyer as set forth in this Agreement.
     m)   The term "Prime Rate" shall mean the fluctuating per annum lending
          rate of interest from time to time published by CITIBANK, NA, or its
          successor, for its best commercial customers.
     n)   The term "psia" shall mean pounds per square inch absolute.
     o)   The term "psig" shall mean pounds per square inch gauge.
     p)   The term "Transporter" shall mean any pipeline transporting gas
          subject to this Agreement.
     q)   The term "Great Lakes Pipeline" shall mean the pipeline owned by Great
          Lakes Gas Transmission Limited Partnership which connects to the 26"
          pipeline owned by the Midland Cogeneration Venture Limited
          Partnership.
     r)   The term "Undisputed Amount" shall have the meaning set forth in
          Section 5A (ii).
2.   Quantity. Seller agrees to deliver and sell and MCV agrees to receive and
     purchase 10,000 MMBtu/day, on a firm basis in accordance with the terms and
     conditions of this Agreement.
3.   Price.
     (A)  The price to be paid by Buyer to Seller for all quantities of gas
          delivered hereunder inclusive of all taxes and other adjustments or
          costs not provided for herein shall be $2.79 per MMBtu for all gas

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          delivered to the interconnection of the Midland Cogeneration Venture
          Limited Partnership's 26" pipeline with Great Lakes Pipeline's Midland
          interconnect located in Isabella County, Michigan.
     (B)  Seller shall be responsible for all taxes prior to the Point of
          Delivery. MCV shall be responsible for all taxes at and after the
          Point of Delivery.
4.   Term. Deliveries of gas shall commence on November 1, 2004 and continue
     through October 31, 2007.
5.   Billing and Payments.
     (A)  Billing and payment procedures are as follows:

               (i)  After the delivery of gas has commenced hereunder, Seller
                    shall, on or about the tenth day of each month, render to
                    Buyer a statement showing the estimated (or actual if
                    available) quantity of gas delivered at each Point of
                    Delivery during the prior month, and the amounts due Seller
                    hereunder. Seller shall also render to Buyer, if necessary,
                    a separate statement showing the adjustment, if any,
                    required to conform the prior month's estimated and actual
                    deliveries and prices. Payment of the amount due based on
                    such statements shall be made by Buyer to Seller by wire
                    transfer with immediately available funds the later of (a)
                    ten (10) days following receipt of such statement or (b) the
                    twentieth (20th) day of the month. If the due date falls on
                    a day which is not a business day, then payment shall be
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                    made on the next business day. If the Buyer bills Seller the
                    same procedure shall be followed as set forth in this
                    subparagraph.
          (ii)      In the event that either Party shall in good faith dispute
                    any portion of the amount shown in the other Party's
                    statement (hereinafter called the "Disputed Amount"), the
                    disputing Party shall (a) notify the other Party in writing
                    as to the Disputed Amount, and (b) pay the remaining
                    undisputed portion of the other Party's statement when due
                    (hereinafter, the "Undisputed Amount").
          (iii)     If it is determined that the failure to pay any Undisputed
                    Amount of any statement was not justifiable, interest on
                    such Undisputed Amount shall accrue at a rate per annum
                    equal to the Prime Rate, plus one percent (1.0%), from the
                    time payment would have been due until the time payment is
                    made, but in no event shall the interest on such unpaid
                    portion exceed the applicable lawful nonusurious rate of
                    interest. Payment of any previously unpaid Undisputed Amount
                    shall be credited first to all interest accrued and then to
                    principle.

   (B)    Each Party hereto shall have the right, upon reasonable written
          notice, during normal business hours and at its own expense to examine
          the books and records of the other Party to the extent necessary to
          verify the accuracy of any statement, charge,

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          computation or demand made under or pursuant to this Agreement. Such
          examination shall be conducted no more than once in a twelve-month
          period. Any error or discrepancy in statements furnished pursuant to
          this Agreement shall be promptly reported to Seller or Buyer, as
          applicable, and proper adjustment thereof shall be made within thirty
          (30) days after final determination of the correct volumes or amounts
          involved; provided, however, that, if no such errors or discrepancies
          are reported to Seller or Buyer, as applicable, within two (2) years
          from the end of the calendar year in which such errors or
          discrepancies occurred, the same shall be conclusively deemed to be
          correct.
6. Deliveries.

     (A)  Exhibit A hereto sets forth the Point of Delivery under this
          Agreement. Seller shall not use any other point to deliver gas without
          Buyer's written consent which Buyer may grant or withhold in its sole
          discretion.

     (B)  To the extent that the procedures for the delivery of gas set forth
          herein conflict with the rules and tariffs of any Transporter, the
          Transporter's rules and tariffs will control and the Parties shall
          cooperate fully with each other in complying with such rules and
          tariffs.

7.   Third Party Gas. Buyer understands and agrees the gas delivered
     hereunder may be supplied either from Seller's gas or from gas
     purchased by Seller from third parties, provided however, if such gas
     is

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          purchased from third parties, Seller shall be solely responsible for
          the payment of the purchase price of gas to such third parties.
8.        Title. Title and risk of loss to gas delivered hereunder shall pass
          from Seller to Buyer at the Point of Delivery.
9.        Delivery Pressure. Seller shall be required to deliver or cause
          delivery of the gas at the Point of Delivery hereunder against the
          varying pressures in the facilities of Buyer's Transporter(s) (MCV's
          26" pipeline); provided however, Seller shall have the right but not
          the obligation to install compression.
10.       Quality of Gas. The gas to be delivered hereunder shall comply with
          the quality requirements of the Seller's Transporter (Great Lakes
          Pipeline) delivering the gas at the Point of Delivery.
11.       Measurement and Tests of Gas. The quantity and quality of gas
          delivered to the Buyer's account at the Point of Delivery shall be
          determined by the Seller's Transporter (Great Lakes Pipeline) in
          accordance with the then current standard terms and conditions
          applicable to Great Lakes Pipeline's gas transportation contracts.
12.       Warranty of Title. Seller hereby warrants (i) title to all gas sold
          hereunder or the right to sell such gas, (ii) that it has the right to
          sell same to Buyer and (iii) that all such gas shall be free from any
          and all liens and adverse claims of any nature whatsoever. Seller
          agrees to indemnify and hold Buyer harmless, including but not limited
          to, all costs, damages and expenses (including Buyer's reasonable
          attorney fees) incurred by Buyer

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          in defending against any liens or adverse claims of any nature
          whatsoever, including but not limited to, third parties from whom
          Seller purchased gas as permitted in Section 7, in addition to any
          other remedies Buyer may have hereunder or at law.
13.       Credit Worthiness.
          13.1      This Agreement is subject to Seller providing Buyer a
                    guaranty from The Coastal Corporation in the form attached
                    hereto as Exhibit "B."
          13.2      At any time, and from time to time during the term of this
                    Agreement (and notwithstanding whether an Event of Default
                    has occurred, as defined in Section 23) but not more than
                    once in any seven (7) day period, if the Termination Payment
                    (as such term is defined in Section 13.5) should exceed
                    $4,000,000 until November 1, 2004 and $5,000,000 thereafter
                    as to MCV, and $8,000,000 as to Seller, (the "Security
                    Threshold"), then either Party may request the other Party
                    to provide additional Performance Assurance in an amount
                    equal to: the amount by which the Termination Payment
                    exceeds the Security Threshold (rounding upwards for any
                    fractional amount to the next $100,000). The Performance
                    Assurance shall be delivered within thirty (30) calendar
                    days of the date of the request. If such additional
                    Performance Assurance is not received by the requesting
                    Party within thirty (30) calendar days, then the requesting
                    Party in addition to any other remedy
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          available, may immediately suspend performance with respect to the
          quantities associated with the amount in excess of the Security
          Threshold plus any Performance Assurance already in place and cover
          such lost supply or market, as the case may be. Incremental gas costs
          (as defined in Section 17 with respect to either Buyer or Seller, as
          applicable) incurred by the covering Party shall be recoverable from
          the other Party. Such suspension will be implemented on a pro rata
          basis to a level at which assurances have been provided. In addition,
          a failure to provide Performance Assurance as requested shall
          constitute an Event of Default under Section 23.
13.3      Either Party, at its sole expense, may request the other Party to
          reduce its Performance Assurance then in place, if the Termination
          Payment (with respect to all Transactions then outstanding) reverts
          back to an amount less than or equal to the sum of the Performance
          Assurance and the Security Threshold then in place (rounding upwards
          for any fractional amount to the next $100,000). Such request for
          reduction shall be no more frequently than weekly with respect to
          Letters of Credit and guaranties, and daily with respect to cash. The
          consent to such request(s) shall not be unreasonably withheld.
13.4      Either Party may at any time make a calculation of the Termination
          Payment and submit same to the other Party for review. If within

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          thirty days of the submission of the value of the Termination Payment
          from one Party to the other, agreement has not been reached by the
          Parties as to the amount of the Termination Payment, the determination
          of the amount of the Termination Payment shall be submitted to
          arbitration as provided for in Section 18 of this Agreement.
          Notwithstanding the submission of the determination of the amount of
          the Termination Payment to arbitration, all requirements in Section 13
          of this Agreement shall remain in effect.
13.5      With respect to this Section 13: (a) "Performance Assurance" means
          collateral in the form of either cash or Letters of Credit. The
          requesting Party may also accept a parental guaranty or other
          collateral deemed sufficient by the requesting Party. If the
          collateral is in the form of cash, then such cash shall be placed in a
          segregated, interest-bearing escrow account on deposit with a major
          U.S. commercial bank having a credit rating of at least "A-" from
          Standard and Poor's or "A3" from Moody's (interest to accrue to the
          Party posting the collateral); (b) "Letter of Credit" means one or
          more irrevocable, transferable standby letters of credit from a major
          U.S. commercial bank or foreign bank with a U.S. office having a
          credit rating of at least "A-" from Standard & Poor's or "A3" from
          Moody's; (c) "Termination Payment" means the amount by which the
          requesting Party shall aggregate Gains, Losses, and

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               Costs (as those terms are defined in Section 23.2 (e)) with
               respect to this Agreement into a single net amount. The
               Termination Payment shall include all amounts owed but not yet
               paid by one Party to the other Party, whether or not such amounts
               are then due, for performance already performed pursuant to any
               Transaction.

14.       Right to Terminate Agreement.

          (A)       In addition to any other remedy of Buyer under law or
                    provided under this Agreement, Buyer shall have the right at
                    its election to terminate this Agreement upon twenty (20)
                    days written notice to Seller if Seller, for any reason,
                    other than (i) force majeure, (ii) Buyer's failure to take,
                    or (iii) a failure by Buyer to pay any Undisputed Amounts,
                    fails, over a period of at least sixty (60) days, to deliver
                    an average of ninety percent (90%) of the agreed quantity
                    and provided further that such failure occurred not more
                    than one hundred forty (140) days immediately preceding the
                    giving of such notice of termination. Seller shall have
                    twenty (20) days after receipt of such cancellation notice
                    to cure any failure in which case Buyer's cancellation is
                    null and void and this Agreement shall remain in full force
                    and effect.

          (B)       In addition to the other remedies of Seller under law or
                    provided under this Agreement, Seller shall have the right
                    at its election to terminate this Agreement upon twenty (20)
                    days written notice to Buyer if Buyer, for any reason, other
                    than (i) force majeure, (ii) Seller's failure to
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               deliver, or (iii) a failure by Seller to pay any Undisputed
               Amounts, fails, over a period of at least sixty (60) days, to
               take a volume of gas not less than an average of ninety percent
               (90%) of the agreed quantity, and provided further that such
               failure occurred not more than one hundred forty (140) days
               immediately preceding the giving of such notice of termination.
               Buyer shall have twenty (20) days after receipt of such
               cancellation notice to cure any failure in which case Seller's
               cancellation is null and void and this Agreement shall remain in
               full force and effect.
15.       Assignment.
          (A)       The terms, covenants and conditions hereof shall be binding
                    on the Parties hereto and on their successors and permitted
                    assignees.
          (B)       Either Party may assign its interest under this Agreement,
                    with the consent of the other Party, which consent shall not
                    be unreasonably withheld, to an affiliate or any company
                    which shall succeed, by merger or consolidation, to
                    substantially all of its assets. In the event of any such
                    assignment, such successor shall be entitled to the rights
                    and shall be subject to the obligations of its predecessor.
                    Seller acknowledges that pursuant to a certain Gas Backup
                    Agreement among Consumers Power Company, The Dow Chemical
                    Company (Dow) and the Midland Cogeneration Venture Limited
                    Partnership dated January 27, 1987, Buyer may be required to
                    make an assignment to Dow of certain rights under this
                    Agreement. Seller
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                    specifically agrees to accept such assignments, if any, made
                    by Buyer to Dow in accordance with the aforementioned Gas
                    Backup Agreement; provided, however, that such assignment
                    shall not relieve Buyer of its obligations under this
                    Agreement absent Seller's written consent.
          (C)       Except as provided above, neither Party shall assign this
                    Agreement without the prior consent of the other Party,
                    which consent shall not be unreasonably withheld. Nothing
                    herein contained shall prevent or restrict either Party from
                    pledging, granting a security interest in, or assigning as
                    collateral all or any portion of such Party's interest to
                    secure any debt or obligation of such Party under any
                    mortgage, deed of trust, security agreement or similar
                    instrument.
          (D)       Either Party desiring to make an assignment for which it has
                    the right pursuant to the foregoing may upon request obtain
                    a written consent within sixty (60) days to such assignment
                    from the other Party evidencing its consent.
16.       Notices. Except as otherwise herein provided, any notice, request,
          demand or statement given in writing or required to be given in
          writing by the terms of this Agreement shall be deemed given when
          deposited in the government mail, postage prepaid, as certified mail,
          directed to the post office address of the Parties as follows:

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         TO SELLER:

         For Invoices and Payments:     Engage Energy US, L.P.
                                        Five Greenway Plaza, Ste. 1200
                                        Houston, Texas 77046
                                        Attn.: Client Services
                                        Telephone: (713) 877-7800
                                        Telecopier: (713) 297-1489
                                        Wire Transfer No. Citibank, NA, NY,

NY,
                                        Acct. # 4071-9415, ABA # 0210-00089

         For all other notices:         Engage Energy US, L.P.
                                        Five Greenway Plaza, Ste. 1200
                                        Houston, Texas  77046
                                        Attn.:  Contract Administration
                                        Telephone:  (713) 877-7800
                                        Telecopier:  (713) 877-3583

         TO BUYER:

         For Invoices and Payments:     Midland Cogeneration Venture
                                        Limited Partnership
                                        Attn.:  Treasury
                                        100 Progress Place
                                        Midland, MI  48640
                                        Telephone No.:  (517) 839-6018
                                        Telecopier:  (517) 839-6137
                                        Wire Transfer:  U.S. Bank Trust, N.A.
                                        Minneapolis, MN
                                        ABA# 091000022
                                        A/C# 180121167365
                                        MI Clearing #47300196 - FBO MCV
                                        76608640

         For all other notices:         Midland Cogeneration Venture
                                        Limited Partnership
                                        100 Progress Place
                                        Midland, MI  48640
                                        Attn.:  Gas Supply Department
                                        Telephone No.:  (517) 839-6008
                                        Telecopier:  (517) 839-6793
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          or at such other address as either Party may from time to time specify
          as its address for such purposes by registered for certified letter
          addressed to the other Party. Notices, requests, demands or statements
          made in person, by telephone, Telecopier, Telex or wire shall be
          deemed given when received provided, however, that if such notices are
          received after 5:00 p.m. (recipient's local time), they shall not be
          effective until the next business day.

          Gas nomination notices will be in accordance with the terms and
          conditions applicable to Great Lakes Pipeline.
17.       Remedies. In the event Seller fails to deliver the daily quantities
          for reasons not otherwise excused by force majeure, Seller shall be
          responsible for any incremental gas costs incurred by MCV in replacing
          such gas. MCV agrees to use commercially reasonable efforts to
          purchase replacement gas at the lowest available price. Seller's
          obligation to pay MCV for incremental replacement gas costs (and any
          transportation penalties or transportation demand charges resulting
          from unused transportation) shall be MCV's sole and exclusive remedy
          for Seller's failure to deliver except as provided in Section 14. In
          the event that MCV fails to take gas for reasons not otherwise excused
          by force majeure, MCV shall pay Seller for any incremental decrease in
          the resale price of such gas. Seller agrees to use commercially
          reasonable efforts to resell such deficiency gas at the highest
          achievable price. MCV's

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          obligation to pay Seller for such decrease (and any transportation
          penalties or transportation demand charges resulting from unused
          transportation) shall be Seller's sole and exclusive remedy for MCV's
          failure to take gas except as provided in Section 14.

18.       Arbitration.
          (A)       If the Parties are unable to resolve a disagreement arising
                    under this Agreement such disagreement shall be settled by
                    arbitration. Either Party may then commence arbitration by
                    serving written notice thereof on the other Party
                    designating the issue to be arbitrated.
          (B)       The Parties shall each appoint one (1) arbitrator and the
                    two (2) arbitrators so appointed will select a third
                    arbitrator, all of such arbitrators to be qualified by
                    education, knowledge, and experience to resolve the dispute
                    or controversy. If either Party fails to appoint an
                    arbitrator within ten (10) days after a request for such
                    appointment is made by the other Party in writing, or if the
                    two (2) appointed fail, within ten (10) days after the
                    appointment of the second, to agree on a third arbitrator,
                    the arbitrator or arbitrators necessary to complete a board
                    of three (3) arbitrators will be appointed upon application
                    by either Party therefor to the American Arbitration
                    Association.
          (C)       The jurisdiction of the arbitrators will be limited to the
                    single issue referred to arbitration and the arbitration
                    shall be conducted pursuant to the guidelines set forth by
                    the American Arbitration Association; provided, however,
                    that should there be any conflict between such

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          guidelines and the procedures set forth in this Agreement, the terms
          of this Agreement shall control.
     (D)  Within fifteen (15) days following selection of the third arbitrator,
          each Party shall furnish the arbitrators in writing its position
          regarding the issue being arbitrated. The arbitrators may, if they
          deem necessary, convene a hearing regarding the issue being
          arbitrated. Within thirty (30) days following the later of the
          appointment of the third arbitrator or of the hearing, if one is held,
          the arbitrators shall notify the Parties in writing as to which of the
          two (2) positions submitted is most consistent with the meaning of
          this Agreement with respect to the issue being arbitrated. No other
          position may be selected. Such decision shall be binding on the
          Parties hereto and shall remain in effect until and unless changed in
          accordance with the provisions of this Agreement.
     (E)  Enforcement of the award may be entered in any court having
          jurisdiction over the Parties.
     (F)  Each Party will pay the expenses of the arbitrator selected by or for
          it, and its counsel, witnesses and employees. All other costs of
          arbitration will be equally divided between Parties.
19.  Force Majeure. The term "force majeure" as employed herein for all purposes
     relating hereto, shall mean acts of God, strikes, lockouts or other
     industrial disturbances, acts of public enemy, wars, blockades,
     insurrections, riots, epidemics, landslides, lightning, earthquakes,

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     hurricanes, explosions, fires, arrests and restraints of governments and
     people, civil disturbance, freeze-up of Seller's wells or wells from which
     Seller is furnishing gas hereunder, or other temporary inability of
     Seller's wells or wells from which Seller is furnishing gas hereunder to
     produce, mechanical breakdowns or repairs of MCV's plant or pipeline
     facilities or those of any Transporter used to transport gas hereunder,
     inability of any Party hereto to obtain necessary materials, supplies or
     permits due to existing or future rules, regulations, orders, laws or
     proclamations of governmental authorities (federal, state or local),
     including both civil and military, and any other causes whether of the kind
     herein enumerated or otherwise, not within the control of the Party
     claiming suspension and which by the exercise of due diligence such Party
     is unable to prevent or overcome.
20.  Transportation. Both Parties shall cooperate in an effort to eliminate
     imbalances on either Party's transporting pipeline(s). The Parties further
     agree that if any imbalance penalties or charges (including cash out
     charges) are imposed on a Party as a result of the other Party's failure to
     deliver or accept the required quantities, then the failing Party shall
     reimburse the non-failing Party for such charges or penalties.
21.  Law. THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUCTED ACCORDING TO THE
     LAWS OF THE STATE OF MICHIGAN.

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22.  Miscellaneous.

     (A)  No waiver by either Seller or Buyer of any default by the other under
          this Agreement shall operate as a waiver of any future default,
          whether of like or different character or nature.
     (B)  The descriptive headings of particular provisions of this Agreement
          are for the purpose of facilitating administration and shall not be
          construed as having any substantive effect on the terms of this
          Agreement.
     (C)  The Parties agree to proceed with due diligence and make good faith
          effort to obtain such governmental authorizations as may be necessary
          to enable performance of this Agreement.
     (D)  This Agreement is subject to the January 27, 1987 Gas Supply Option
          between Buyer and Dow and to Dow's rights under a certain Gas Backup
          Agreement with Buyer and Consumers Power Company dated January 27,
          1987.
     (E)  If any provision of this Agreement is determined to be invalid, void
          or unenforceable by any court having jurisdiction, such determination
          shall not invalidate, void or make unenforceable any other provision
          of this Agreement.
     (F)  Neither Buyer nor Seller shall disclose to any third Party other than
          its partners, parents, affiliates, directors, officers, employees,
          consultants, representatives, agents or those third parties providing
          financing to it, any information received from the other Party that is
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          explicitly marked "Confidential" (such information hereinafter
          referred to as ("Confidential Information"); provided however, that
          nothing shall be deemed Confidential Information which:
               (i)   is part of the public domain;
               (ii)  becomes publicly known otherwise than through an action or
                     inaction of the receiving Party;
               (iii) is independently developed by the receiving Party; or
               (iv)  is required to be disclosed pursuant to any law, rule, or
                     regulation, or pursuant to any order of a governmental
                     instrumentality, provided that the Party receiving the
                     order shall, if feasible, notify the other Party of any
                     such requirement at least ten (10) days before compliance
                     is required, and if so requested by the other Party, shall
                     use reasonable efforts to oppose the required disclosure,
                     as appropriate under the circumstances, or to otherwise
                     make such disclosure pursuant to a protective order or
                     other similar arrangement for confidentiality.
     (G)  This Agreement may be amended only by a written instrument executed by
          the Parties hereto. This Agreement, the Guaranty (Exhibit B attached
          hereto), and the Consent and Agreement (Exhibit C attached hereto)
          contain the entire understanding of the Parties with respect to the
          matter contained in said documents. There are no

<PAGE>   21

          promises, covenants or undertakings other than those expressly set
          forth in said documents.
     (H)  Buyer represents and warrants that it has full and complete authority
          to enter into and to perform this Agreement. Seller represents and
          warrants that it has full and complete authority to enter into and to
          perform this Agreement. Each person who executes this Agreement on
          behalf of Buyer represents and warrants that he or she has full and
          complete authority to do so and that Buyer will be bound thereby. Each
          person who executes this Agreement on behalf of Seller represents and
          warrants that he or she has full and complete authority to do so and
          that Seller will be bound thereby.
     (I)  Notwithstanding anything to the contrary contained in this Agreement,
          the liabilities and obligations of MCV arising out of, or in
          connection with, this Agreement or any other agreements entered into
          pursuant hereto shall not be enforced by any action or proceeding
          wherein damages or any money judgment or specific performance of any
          covenant in any such document and whether based upon contract,
          warranty, negligence, indemnity, strict liability or otherwise, shall
          be sought against the assets of the partners of MCV. By entering into
          this Agreement, Seller waives any and all right to sue for, seek or
          demand any judgment against such partners and their affiliates, other
          than MCV by reason of the performance by MCV of its obligations under
          this Agreement or any other agreements entered into pursuant

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          hereto, except to the extent such partners are legally required to be
          named in any action to be brought against MCV.
23.    Defaults and Remedies.
       23.1    Event of Default. A Party shall be deemed in default under this
               Agreement upon the occurrence of any one or more of the following
               events ("Events of Default"):
          (a)  The unexcused failure by a Party (the "Defaulting Party") to
               make, when due, any payment required pursuant to this Agreement
               if such failure is not remedied within three (3) business days
               after written notice of such failure is given to the Defaulting
               Party by the other Party (the "Non-Defaulting Party") and
               provided the payment is not a Disputed Amount as described in
               Section 5(A)(ii);
          (b)  Any representation or warranty made by a Party herein shall at
               any time during the term of this Agreement prove to be false or
               misleading in any material respect;
          (c)  The failure by a Party to perform, in any material respect, any
               material covenant or provision set forth in this Agreement (other
               than (i) the events that are otherwise specifically covered in
               this Section 23.1 as a separate Event of Default and (ii) the
               events that are covered in Sections 14 and 17) and such failure
               is not cured within five (5) business days (or such longer period
               of time if reasonably necessary to cure the failure and the
               Defaulting Party is making continuous and diligent efforts to
               cure) after written

<PAGE>   23

               notice thereof to the Defaulting Party unless such failure is
               excused by force majeure;
          (d)  A Party becomes subject to a Bankruptcy Proceeding; or
          (e)  The failure of a Party, upon the occurrence of a Material Adverse
               Change, to provide, for so long as the Material Adverse Change is
               occurring, adequate assurance (in the form of cash or a Letter of
               Credit to be provided at the election of the Defaulting Party or
               a guaranty deemed acceptable by the Non-Defaulting Party which
               such acceptance of such guaranty may not be unreasonably
               withheld) of its ability to perform all of its outstanding
               obligations to the Non-Defaulting Party under this Agreement,
               within a period not to exceed three (3) business days of the
               Defaulting Party's receipt, in accordance with the notice
               provisions of Section 16, of a demand therefore by the
               Non-Defaulting Party.
           The term "Material Adverse Change" shall mean: (i) with respect to
               The Coastal Corporation, having consolidated net worth of less
               than $2.0 billion as presented in its financial statements, and
               (ii) with respect to MCV having less than $60 million of its Cash
               Reserves as reported in the Liquidity Section of Midland
               Cogeneration Venture's annual 10K report and quarterly 10Q
               report. Cash Reserves equal the total cash reserves as reported
               less the funds restricted for rental payments (presently

<PAGE>   24

               $137,000,000) and funds restricted for management non-qualified
               plans (presently $0).

<PAGE>   25

23.2     Remedies Upon an Event of Default.

         (a)  If an Event of Default occurs with respect to a Defaulting Party
              at any time during the term of this Agreement, the Non-Defaulting
              Party shall have the right, for so long as the Event of Default is
              continuing, to (i) establish a date (which date shall be between 5
              and 10 business days after the Non-Defaulting Party delivers
              written notice to the Defaulting Party of its intent to exercise
              the remedy described herein) ("Early Termination Date") on which
              this Agreement shall terminate and (ii) withhold any payments due;
              provided, however, upon the occurrence of any Event of Default
              listed in item (d) of Section 23.1 as it may apply to any Party,
              this Agreement in respect thereof shall automatically terminate,
              without notice, and without any other action by either Party as if
              an Early Termination Date had been declared immediately prior to
              such event.
         (b)  If an Early Termination Date has been designated, the
              Non-Defaulting Party shall in good faith calculate its Gains,
              Losses and Costs resulting from the termination of this Agreement.
              The Gains, Losses and Costs shall be determined by comparing the
              value of the remaining term, Contract Quantities and Contract
              Prices under this Agreement had it not been terminated, to the
              equivalent quantities and relevant market prices for the remaining
              term either quoted by a bona fide third-

<PAGE>   26

              party offer or which are reasonably expected to be available in
              the market under a replacement contract for the balance of this
              Agreement. To ascertain the market prices of a replacement
              contract, the Non-Defaulting Party may consider, among other
              valuations, settlement prices of NYMEX natural gas futures
              contracts, quotations from leading dealers in natural gas swap
              contracts and other bona fide third party offers, all adjusted for
              the length of the remaining term and differences in
              transportation. It is expressly agreed that a Party shall not be
              required to enter into replacement transactions in order to
              determine the Termination Amount (as hereinafter defined.)
         (c)  The Non-Defaulting Party shall aggregate such Gains, Losses and
              Costs with respect to the balance of this Agreement into a single
              net amount ("Termination Amount"). The Non-Defaulting Party shall
              provide the Defaulting Party with a notice and statement
              containing a clear identification and calculation of the
              Termination Amount owed by or due to the Defaulting Party and
              shall be accompanied by sufficient information to enable the
              Defaulting Party to determine the basis upon which the calculation
              was made and the accuracy thereof. If the Non-Defaulting Party's
              aggregate Losses and Costs exceed its aggregate Gains, the
              Defaulting Party shall, within five (5) business days of receipt
              of such statement, pay the Termination

<PAGE>   27

              Amount to the Non-Defaulting Party, which amount shall bear
              interest at the interest rate as set forth in Section 5(A)(iii)
              above, from the Early Termination Date until paid. If the
              Non-Defaulting Party's aggregate Gains exceed its aggregate Losses
              and Costs, if any, resulting from the termination of this
              Agreement, the Non-Defaulting Party shall pay such excess to the
              Defaulting Party on or before the latter of: (i) twenty (20) days
              after the end of the month ending on or after the Early
              Termination Date, and (ii) five (5) business days after receipt by
              the Defaulting Party of the Non-Defaulting Party's notice of the
              Termination Amount, which amount shall bear interest at the
              interest rate as set forth in Section 5(A)(iii) above, from the
              Early Termination Date until paid.
         (d)  If the Defaulting Party disputes the Non-Defaulting Party's right
              to terminate this Agreement or disagrees with its calculation of
              the Termination Amount, in whole or in part, the Defaulting Party
              shall, within three (3) business days of receipt of the
              Non-Defaulting Party's calculation of the Termination Amount,
              provide to the Non-Defaulting Party a detailed written explanation
              of the basis for such dispute or disagreement and, if the
              Termination Amount is due from the Defaulting Party, shall
              promptly pay to the Non-Defaulting Party such portion thereof as
              is conceded to be correct. Upon receipt of the

<PAGE>   28

              Defaulting Party's explanation, the Parties shall seek to resolve
              the issues in accordance with mutually agreeable dispute
              resolution procedures.
         (e)  As used herein in this Section 23.2, with respect to each Party:
              (i) "Costs" shall mean reasonable brokerage fees, commissions and
              other similar transaction costs and expenses reasonably incurred
              by a Party either in terminating or entering into new arrangements
              which replace this Agreement, and reasonable attorney's fees, if
              any reasonably incurred in connection with enforcing its rights
              under this Agreement; (ii) "Gains" shall mean an amount equal to
              the present value (calculated using the interest rate as set forth
              in Section 5(A)(iii) above as the prevailing discount rate) of the
              economic benefit (exclusive of Costs), if any, to a Party
              resulting from the termination of its obligations with respect to
              this Agreement, determined in a commercially reasonable manner;
              and (iii) "Losses" shall mean an amount equal to the present value
              (calculated using the interest rate as set forth in Section
              5(A)(iii) above as the prevailing discount rate) of the economic
              loss (exclusive of Costs), if any, to a Party from the termination
              of its obligations with respect to this Agreement, determined in a
              commercially reasonable manner. In no event, however, shall a
              Party's Costs, Gains or Losses include any costs or expenses
              incurred

<PAGE>   29

              by a Party in terminating or re-establishing any arrangement
              pursuant to which it has hedged its obligations under this
              Agreement.

24.  Limitations: NEITHER PARTY HERETO SHALL BE LIABLE TO THE OTHER PARTY FOR
     ANY CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES ARISING OUT OF, OR
     RELATED TO, A BREACH OF THIS AGREEMENT.
         IN WITNESS WHEREOF, this Agreement is executed in multiple originals
effective as of the day and year first herein above written.

         BUYER                              MIDLAND COGENERATION VENTURE
                                                     LIMITED PARTNERSHIP
                                                     By: LeRoy W. Smith
                                                        ------------------------
                                                     Name:  LeRoy W. Smith
                                                     Title:  V.P. Gas Supply

         SELLER                             ENGAGE ENERGY U.S., L.P.
                                                     By:  Clark C. Smith
                                                        ------------------------
                                                     Name: Clark C. Smith
                                                     Title:  President and CEO

<PAGE>   30

                                    EXHIBIT A
                                POINT OF DELIVERY

               Great Lakes Gas Transmission - Midland Interconnect

<PAGE>   31

                                    EXHIBIT B

                                    GUARANTY

         Guaranty dated effective as of the 1st day of January, 1999, by The
Coastal Corporation, a Delaware corporation (hereinafter referred to as the
"Guarantor"), in favor of Midland Cogeneration Venture Limited Partnership, a
Michigan partnership (hereinafter referred to as "Creditor").
         WHEREAS, Creditor and Engage Energy U.S., L.P. (hereinafter referred to
as "Debtor") have entered into a certain Gas Sales Agreement dated November 15,
1998 (hereinafter referred to as the "Contract"); and
         WHEREAS, as a condition precedent to Creditor's entering into the
Contract, Guarantor has agreed to provide this Guaranty as provided herein;
         NOW, THEREFORE, for and in consideration of the premises, Guarantor
hereby agrees as follows:
1.   Guaranty. Guarantor unconditionally guarantees to Creditor the payment of
     amounts due and payable by Debtor pursuant to the Contract up to a maximum
     amount in the aggregate of $8,000,000 (such obligations being hereinafter
     referred to as the "Obligations"); provided, however, that as to
     Obligations which Guarantor is called upon to honor, Guarantor is and shall
     be entitled to assert any and all claims, counterclaims, defenses, offsets
     and other rights which Debtor could assert against Creditor with respect to
     the Obligations, except as provided in paragraph 7 below. In the event
     Debtor defaults in the payment of any of the Obligations, after thirty days
     written

<PAGE>   32

     notice to Guarantor at the address provided below, Guarantor shall make
     such payment or otherwise cause same to be paid. Guarantor's Obligations
     are subject to its receiving from Creditor copies of any and all notices of
     defaults and events of default given by Creditor to Debtor pursuant to the
     Contract in the same manner and at the same time as such notices are given
     by Creditor to Debtor, except to Guarantor's address for notice set forth
     in this Guaranty.
2.   Termination. This Guaranty is continuing and irrevocable and shall remain
     in full force and effect until such time as all of the Obligations have
     been fully satisfied, performed and discharged.
3.   Waivers. Except as is otherwise provided in this Guaranty, Guarantor waives
     notice of acceptance of the guaranty contained herein, presentment, demand,
     notice of dishonor, protest and notice of protest, and prosecution of
     litigation in connection with the Obligations.
4.   Assignment. Neither Guarantor nor Creditor may assign its respective rights
     or obligations under this Guaranty without the other's written consent.
     Subject to the foregoing, this Guaranty shall be binding upon and inure to
     the benefit of the parties hereto and their respective successors,
     permitted assigns, and legal representatives.
5.   Notices. Any notice or other communication required or permitted to be
     given to Guarantor under this Guaranty shall be deemed to have been given
     when delivered personally or otherwise actually received or on the tenth
     (10th) day after being deposited in the United States mail if registered or

<PAGE>   33

     certified, postage prepaid, or one (1) day after delivery to a nationally
     recognized overnight courier service, fee prepaid, return receipt
     requested, if in writing and addressed as follows: The Coastal Corporation,
     Nine Greenway Plaza, Houston, Texas 77046, Attention: Secretary.
6.   Applicable Law. This Guaranty shall in all respects be governed by,
     enforced under and construed in accordance with the laws of the State of
     Texas.
7.   Effect of Certain Events. Guarantor agrees that Guarantor's liability
     hereunder will not be released, reduced, impaired or affected by the
     occurrence of any one or more of the following events:
     a. The insolvency, bankruptcy, reorganization, or disability of Debtor;
     b. The renewal, consolidation, extension, modification, or amendment from
        time to time of the Contract;
     c. The failure, delay, waiver, or refusal by Creditor to exercise any right
        or remedy held by Creditor with respect to the Contract;
     d. The sale, encumbrance, transfer or other modification of the ownership
        of Debtor or the change in the financial condition or management of
        Debtor.
        IN WITNESS WHEREOF, Guarantor has duly executed this Guaranty effective
as of the date first written above.
                                                   THE COASTAL CORPORATION
                                                   BY: J. B. Levos
                                                   Vice President and Controller

<PAGE>   34

                                    EXHIBIT C
                              CONSENT AND AGREEMENT

         CONSENT AND AGREEMENT, dated as of November 15, 1998, made by Engage
Energy US L.P., a Delaware limited partnership, (the "undersigned") to the
parties whose names appear on Schedule A attached hereto (the "Transaction
Parties"), provides as follows:

         1. Midland Cogeneration Venture Limited Partnership ("MCV"), and the
undersigned entered into the Gas Sales Agreement, dated November 15, 1998, as
the same may be amended, modified or supplemented from time to time in
accordance with the provisions thereof and of this Consent and Agreement (the
"Contract"). MCV was the owner of an approximately 1370 MW gas-fired
cogeneration facility in Midland, Michigan (the "Facility"). Pursuant to several
separate Participation Agreements, each dated as of June 1, 1990, MCV sold and
leased-back several separate Undivided Interests in the Facility under several
separate Leases each having a basic term of 25 years. The general structure of
the sale and lease-back transactions is described in more detail in Schedule B
attached hereto.

         2. The undersigned hereby acknowledges notice of the sale and
lease-back transactions described in Schedule B and receipt of a photocopy of
each Participation Agreement (including Appendix A thereto but excluding other
Appendices, Exhibits and Schedules referenced therein unless specifically
requested). Photocopies of the related Transaction Documents will be made
available by MCV to the undersigned at its request for inspection. The
undersigned further acknowledges and consents to the assignments of and Liens on
the Contract pursuant to the Transaction Documents related to each sale and
lease-back transaction, and hereby agrees with each of the Transaction Parties
(provided, however, that each of the Indenture Trustees will have the rights set
forth herein only until the undersigned receives written notice from such
Indenture Trustee that the related Undivided Interest in the Facility is no
longer subject to the Lien of the Indenture to which such Indenture Trustee is a
party and the Secured Notes issued pursuant to such Indenture have been paid in
full) that:

                  (a) Each Owner Trustee and each related Indenture Trustee
shall be entitled, after a Lease Event of Default or an Indenture Event of
Default under the Lease or the Indenture, as the case may be, to which such
Person is a party, to exercise any and all rights of MCV under the Contract in
accordance with the terms of the related Lease, the related Lessee Security
Agreement, the related Indentures and this Consent and Agreement, and the
undersigned will comply in all respects with such exercise by any of such
Persons.

<PAGE>   35

                  (b) The undersigned will give each owner Trustee and Indenture
Trustee prompt written notice of any default of which it has knowledge under the
Contract which, if not cured, would give the undersigned the right to suspend
its performance under, or to terminate, the Contract. Each Owner Trustee and
Indenture Trustee (and their respective designee(s)) shall have the right,
within 30 days (or such longer period, not to exceed 90 days, as may reasonably
be required to cure defaults other than defaults in respect to the nonpayment of
money by MCV) of receipt by each such Person of such written notice, to cure
such default.

                  (c) In the event any Owner Trustee or Indenture Trustee
succeeds to MCV's rights or interests under the Contract after a Lease Event of
Default or an Indenture Event of Default under the Lease or the Indenture, as
the case may be, to which such Person is a party, whether by foreclosure or
otherwise, such Person shall have the right to exercise all rights of MCV under
such Contract, and the undersigned will comply in all respects with such
exercise by such Person.

                  (d) The exercise of remedies under any Lease or foreclosure of
any Indenture, whether by judicial proceedings or under power of sale contained
in such Indenture or otherwise or any conveyance from MCV or any Owner Trustee
to either related Indenture Trustee in lieu thereof, following a Lease Event of
Default or Indenture Event of Default under the Lease or the Indenture, as the
case may be, to which such Person is a party, shall not require the further
consent of the undersigned.

         3. It is understood and agreed that the Contract and this Consent and
Agreement are subject to all tariffs and all Applicable Laws relating to such
services. Except as required, in the undersigned's reasonable opinion or by any
Applicable Law, the undersigned will not, without the prior written consent of
each Owner Trustee and Indenture Trustee (unless MCV delivers to the undersigned
a certificate stating that such consent is not required by the terms of the
related Transaction Documents), cancel, amend, modify or terminate or accept any
cancellation, amendment, modification or termination thereof, except if such
cancellation or termination is in accordance with the express terms of the
Contract, but subject to the rights of each Owner Trustee and Indenture Trustee
to cure any defaults and to keep the Contract in full force and effect as
provided in Section 2(b) above.

         4. In the event that any Owner Trustee or Indenture Trustee (or their
respective designee(s)) assumes the Contract or otherwise elects to perform the
duties of MCV under the Contract, such Person shall not have any personal
liability to the undersigned for the performance of MCV's obligations under the
Contract, it being understood that the sole recourse of the undersigned seeking

<PAGE>   36

enforcement of such obligations shall be to such Person's interest in the
Facility and the related rights and Revenues therefrom.

         5. If the Contract is rejected by a trustee or debtor-in-possession in
any bankruptcy, insolvency or similar proceeding involving any Persons other
than the undersigned, or is terminated for any other reason (except as a result
of a default which was not appropriately cured as provided herein and in the
Contract), and if, (i) within 30 days thereafter, MCV (in the case of a
bankruptcy, insolvency or similar proceeding involving any Owner Trustee or
Owner Participant), any Owner Trustee, Indenture Trustee or their respective
successors or assigns so request and (ii) all payment defaults under the
Contract have been cured, the undersigned will execute and deliver to the Person
or Persons making such request in proportion to their respective interests in
the Contract a new Contract for the services remaining to be performed under the
original Contract and containing the same terms and conditions as the original
Contract (except for any requirements which have been fulfilled prior to such
termination). Such new Contract also shall be subject to the terms of this
Consent and Agreement.

         6. The undersigned acknowledges that after the end of the respective
Lease Terms and during the respective Residual Terms, each Owner Trustee, as the
assignee of an Undivided Interest in the Contract pursuant to the related
Facility Agreements Assignment, shall have all of the rights and shall be liable
for all of the obligations (to the extent of its respective Undivided Interest
Percentage) on a non-recourse basis of MCV under the Contract. The undersigned
further acknowledges that MCV shall be the initial Operator of the Facility
under the Operating Agreement and further agree that the Owner Trustees may
appoint any Person to serve as a successor Operator thereunder so long as such
Person satisfies the requirements set forth in the Operating Agreement.

         7. No termination, amendment or waiver of any provision of this Consent
and Agreement or consent to any departure by the undersigned from any provision
of this Consent and Agreement shall be effective unless the same shall be in
writing and signed by the Owner Trustees, the Indenture Trustees and MCV and
then such waiver or consent shall be effective only in a specified instance for
the specific purpose for which it was given.

         8. This Consent and Agreement shall be governed by, and construed in
accordance with, the laws of the State of Michigan, and shall be binding on the
parties hereto and their respective successors and assigns.

         IN WITNESS WHEREOF, the undersigned by its officers thereunto duly
authorized, have duly executed this Agreement as of the day and year first above
written.

<PAGE>   37

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

                                                     By: Clark C. Smith

                                                     Title: President & CEO

Seen and Agreed to this 20 day of January , 1999.

MIDLAND COGENERATION VENTURE
    LIMITED PARTNERSHIP, as
    Lessee

By:  LeRoy Smith

Title: Vice President Energy Supply and Marketing

<PAGE>   38

                                   SCHEDULE A

MIDLAND COGENERATION VENTURE LIMITED PARTNERSHIP,
as Lessee,

FIRST MIDLAND LIMITED PARTNERSHIP,
DCC PROJECT FINANCE ONE, INC.,
EDISON CAPITAL (formerly, Mission Funding Epsilon),
BELL ATLANTIC CREDIT CORPORATION (formerly, NYNEX Credit Company),
RESOURCES CAPITAL MANAGEMENT CORPORATION,
as the several Owner Participants,

STATE STREET BANK AND TRUST COMPANY
(formerly, Fleet National Bank, Shawmut Bank Connecticut, National
Association, and The Connecticut National Bank),
not in its individual capacity but solely as Owner Trustee
under several separate Trust Agreements,

UNITED STATES TRUST COMPANY OF NEW YORK,
not in its individual capacity but solely as Senior Indenture Trustee
under several separate Senior Trust Indenture, Leasehold Mortgage
and Security Agreements for the benefit of the Senior Secured Notes,

FIRST UNION NATIONAL BANK
(formerly, Meridian Trust Company),
not in its individual capacity but solely as Subordinated Indenture Trustee
under several separate Subordinated Trust Indenture,
Leasehold Mortgage and Security Agreements
for the benefit of the Subordinated Secured Notes, and

MIDLAND FUNDING CORPORATION I AND
MIDLAND FUNDING CORPORATION II,
as purchasers of the Secured Notes.

<PAGE>   39

                                   SCHEDULE B

                  A. As described below, the Owner Participants named in
Schedule A acquired separate Undivided Interests in the Facility and leased such
Undivided Interests back to MCV through separate Owner Trustees acting on behalf
of separate Owner Trusts. The beneficial interest in each Owner Trust is held by
Owner Participant.

                  B. For purposes of this Schedule B and the Consent and
Agreement, capitalized terms used herein and not otherwise defined herein shall
have the meanings assigned to such terms in Appendix A to the several separate
Amended and Restated Participation Agreements (the "Participation Agreements"),
each dated as of June 1, 1990, to which MCV, an Owner Participant, the related
Owner Trustee, the related Indenture Trustees, the Funding Corporations, MDC and
the Institutional Senior Bond Purchasers named therein are parties. The rules of
usage set forth in such Appendices also shall apply hereto; provided, that when
the terms defined in Appendix A to a particular Participation Agreement as
relating only to the transaction contemplated therein are used in the plural
herein, such terms are intended to apply to the terms applicable to the
transactions contemplated by all Participation Agreements collectively. In
addition, the word "related", when used with respect to any Person, interest,
instrument, agreement or document, shall denote a Person which is a party to, or
an interest, instrument, agreement or document which is a part of, the
transaction contemplated in a particular Participation Agreement and the
Transaction Documents referred to in such Participation Agreement.

                  C. Pursuant to a related Participation Agreement, MCV sold and
transferred to each Owner Trustee, and each Owner Trustee acquired, subject to
Dow's Prior Rights and Consumers' Prior Rights, an Undivided Interest in the
Facility equal to the respective Undivided Interest Percentage of such Owner
Trustee (with the Undivided Interests in the Initial Assets having been sold and
transferred on the First Closing Date and the Undivided Interests in the Second
Closing Assets being sold and transferred on the Second Closing Date). Each
Owner Trustee leased its Undivided Interest in the Facility back to the Lessee
pursuant to a related Lease, under which MCV has the use, possession and control
of the Undivided Interest in the Facility for the related Lease Term (with the
Undivided Interests in the Initial Assets having been leased on the First
Closing Date and the Undivided Interests in the Second Closing Assets being so
leased on the Second Closing Date).

                  D. On the Second Closing Date, (i) MCV assigned to each Owner
Trustee a separate Undivided Interest in the Facility Agreements and the
Cogeneration Agreements pursuant to a related Facility Agreements Assignment

<PAGE>   40

and a related Cogeneration Agreements Assignment, respectively, (ii) each Owner
Trustee assumed the obligations of MCV under the PPA and the SEPA, to the extent
of its respective Undivided Interest Percentage, pursuant to a related
Cogeneration Agreements Assignment, (iii) pursuant to the related Lease, each
Owner Trustee subassigned its Undivided Interests in the Cogeneration Agreements
and Facility Agreements back to MCV for the respective Lease Term, subject to
the Lien of the related Indentures, and MCV, as lessee, accepted such
subassignment, and (iv) MCV granted to each Owner Trustee a Lien on, without
limitation, MCV's right, title and interest in the related Undivided Interests
in the Cogeneration Agreements and the Facility Agreements (and the Revenues
therefrom) as collateral security for the related Secured Obligations pursuant
to a related Lessee Security Agreement.

                  E. Each Owner Trustee, as provided in the related
Participation Agreement, financed a portion of the Purchase Price for its
Undivided Interest in the Facility with the proceeds of Senior Secured Notes
issued by it to Midland Funding Corporation I pursuant to a related Senior Trust
Indenture and related Subordinated Secured Notes issued by it to Midland Funding
Corporation II pursuant to a related Subordinated Trust Indenture, and Midland
Funding Corporation I and Midland Funding Corporation II purchased such Secured
Notes.

                  F. Each Owner Trustee granted to the related Indenture
Trustees Liens on, among other things, the Owner Trustee's Undivided Interests
in the Facility, the Cogeneration Agreements and the Facility Agreements, the
Site Interest and its interest in certain of the related Transaction Documents
as collateral security for the Owner Trustee's obligations under the related
Secured Notes.

                  G. On the Second Closing Date, the Funding Corporations issued
Bonds pursuant to a Senior Collateral Trust Indenture and a Subordinated
Collateral Trust Indenture, respectively, for the purpose of participating in
the payment of the Purchase Price for each Undivided Interest in the Facility
and acquiring the funds necessary to purchase the Senior Secured Notes and the
Subordinated Secured Notes pursuant to a related Participation Agreement. The
Funding Corporations secured their obligations under the Bonds by a pledge to
the related Collateral Trust Trustees of the related Secured Notes (and the
collateral security therefor) held by the Funding Corporations.

                  H. MCV, each Owner Trustee and Indenture Trustee and the
Working Capital Lender, on the Second Closing Date, entered into an
Intercreditor Agreement with the Collateral Agent providing for the deposit with
and disbursement of all Revenues from the Undivided Interests in the Project by
the Collateral Agent.

<PAGE>   41

                  I. MCV and each Owner Trustee also entered into an Operating
Agreement appointing MCV as the initial operator of the Project during the
respective Residual Terms, commencing on the Operation Commencement Date (as
such term is defined in the Operating Agreement).

                  J. On the Second Closing Date, in order to obtain necessary
working capital for the operation of the Facility, MCV obtained the Working
Capital Line from the Working Capital Lender and granted to the Working Capital
Lender first priority Liens on MCV's right, title and interest (as subassignee
of the separate Undivided Interests in the Cogeneration Agreements and the
Facility Agreements during the respective Lease Terms) in and to (i) all Earned
Receivables, (ii) its Natural Gas Inventory and (iii) the Gas Brokering
Contract.

                  K. Each Owner Trustee has agreed to reassign its Undivided
Interest in the Project (including the Undivided Interest in the Facility
Agreements) and the Site Interest back to MCV at the expiration of the related
Support Term.<PAGE>   1
                                                                   EXHIBIT 10.38

                               GAS SALES AGREEMENT

This Agreement is made this 20th of September, 1999, between Midland
Cogeneration Venture Limited Partnership ("MCV" or "Buyer") and Engage Energy
U.S., L.P. ("Seller") for the purpose of entering into a long-term gas supply
arrangement on the terms and conditions which follow. In this Agreement, Seller
and Buyer may also be referred to individually as "Party" or collectively as
"Parties."

1.       Definitions. The following terms when used in this Agreement, shall
         have the following meanings:

         a)   The term "Agreement" means this Agreement and all Exhibits hereto.

         b)   The term "business day" shall mean: any day other than a day on
              which banks in Michigan are allowed by law to be closed.

         c)   The term "Btu" shall mean one (1) British Thermal Unit, the amount
              of heat required to raise the temperature of one (1) pound of
              water one (1) degree Fahrenheit at sixty (60) degrees Fahrenheit.
              BTU is measured on a dry basis.

         d)   The term "Contract Year" shall mean any calendar year during the
              term of this Agreement.

         e)   The term "cubic foot of gas" shall mean the volume of gas
              contained in one (1) cubic foot of space at a pressure of fourteen
<PAGE>   2
              and seventy-three hundredths (14.73) dry psia, at a temperature of
              sixty degrees (60 degrees) Fahrenheit.

         f)   The term "day" shall mean a period of twenty-four (24) consecutive
              hours (23 hours when changing from Standard to Daylight time and
              25 hours when changing back to Standard time), beginning and
              ending at 9:00 a.m. Central clock time.

         g)   The term "Disputed Amount" shall have the meaning set forth in
              Section 5A(ii).

         h)   The term "gas" shall mean any mixture of hydrocarbon and
              non-combustible gases in a gaseous form, consisting primarily of
              methane, and includes natural gas produced from gas wells (gas
              well gas), gas which immediately prior to being produced from a
              reservoir is in solution with crude oil, or dispersed in an
              intimate association with crude oil, or in contract with crude oil
              across a gas-oil contact (casinghead gas), or residue gas
              resulting from the processing of either or both casinghead gas and
              gas well gas.

         i)   The term "Mcf" shall mean one thousand (1,000) cubic feet of gas.

         j)   The term "MMBtu" shall mean a quantity of gas equal to one million
              (1,000,000) Btu which is equivalent to one (1) dekatherm.

         k)   The term "month" shall mean the period beginning at 9 a.m. Central
              clock time on the first day of any calendar month and ending at 9
              a.m. Central clock time on the first day of the next succeeding
              calendar month.
<PAGE>   3

         l)   The term "Point of Delivery" shall mean the point where Seller
              delivers gas to Buyer as set forth in this Agreement. The Point(s)
              of Delivery are set forth on Exhibit A.

         m)   The term "Prime Rate" shall mean the fluctuating per annum lending
              rate of interest from time to time published by CITIBANK, NA, or
              its successor, for its best commercial customers.

         n)   The term "psia" shall mean pounds per square inch absolute.

         o)   The term "psig" shall mean pounds per square inch gauge.

         p)   The term "Transporter" shall mean any pipeline transporting gas
              subject to this Agreement.

         q)   The term "Great Lakes Pipeline" shall mean the pipeline owned by
              Great Lakes Gas Transmission Limited Partnership ("GLGT") which
              connects to the 26" pipeline owned by the Midland Cogeneration
              Venture Limited Partnership.

         r)   The term "Undisputed Amount" shall have the meaning set forth in
              Section 5A (ii).

2.       Quantity. Seller agrees to deliver and sell and MCV agrees to receive
         and purchase 20,000 MMBtu/day, on a firm basis in accordance with the
         terms and conditions of this Agreement. If Seller is delivering to the
         Midland-MCV Point of Delivery, then the 20,000 MMBtu/day shall be
         reduced by an amount equal to the fuel/loss/unaccounted-for percentage
         attributable to the route between Emerson and Midland-MCV as set forth
         in the then-effective GLGT Tariff.

<PAGE>   4
3.       Price.

         (A)For the period November 1, 2004 through October 31, 2005, the price
            to be paid by Buyer to Seller for all quantities of gas delivered
            hereunder, inclusive of all taxes shall be: (i) for deliveries made
            to the Emerson Point of Delivery, the price per MMBtu will be equal
            to NYMEX Closing Price flat; (ii) for deliveries made to the
            Midland-MCV Point of Delivery, the price per MMBtu will be equal to
            the sum of the following:

              (i)  NYMEX Closing Price flat,

              plus

              (ii) the then-effective maximum fuel/loss/unaccounted-for charges
                   (FL&U) as specified in the Great Lakes Gas Transmission
                   tariff ("the GLGT Tariff") for firm transportation service
                   between Emerson and Midland. The calculation of this amount
                   shall be made according to the following formula:

                     NYMEX Closing Price flat
                    (------------------------) minus NYMEX Closing Price flat
                              1-FL&U

              plus,

              (iii)the, variable commodity charges, surcharges, taxes and any
                   other variable charges that are, or would be, applicable to
                   receiving supplies at the Emerson Point of Delivery and
                   transporting such supplies to the Midland-MCV Point of
<PAGE>   5

                   Delivery under the rates set forth in MCV's FT028 Service
                   Agreement with GLGT (or its effective equivalent in the event
                   FT028 ceases to exist), provided, however, that such variable
                   charges shall not be less than zero.

            In the event the rates for variable charges under MCV's FT028 (or
            equivalent successor agreement) change from the current maximum
            tariff rate, then MCV shall provide prior written notice to Engage
            specifying the extent of the changes for Engage's billing purposes.
            The term "NYMEX Closing Price" shall mean the closing ("settle")
            price on the NYMEX for natural gas for delivery (at the Henry Hub)
            in the month of delivery in question on the last day on which
            futures contracts for gas for delivery in such month were traded.

            For the period November 1, 2005 through October 31, 2007, the price
            to be paid by Buyer to Seller for all quantities of gas delivered
            hereunder, inclusive of all taxes shall be: the price per MMBtu will
            be equal to the NYMEX Closing Price plus $0.19.

         (B)Should natural gas futures contracts (for delivery at Henry Hub)
            cease to be traded on the NYMEX, Buyer and Seller shall identify and
            agree on a replacement index. In the event that Buyer and Seller
            cannot agree on a replacement index within thirty (30) days, either
            Party may request the matter be submitted to an expert for
            determination in accordance with Section 18(G) hereof.
<PAGE>   6

         (C)Seller shall be responsible for all taxes prior to the Point of
            Delivery. MCV shall be responsible for all taxes at and after the
            Point of Delivery.

4.       Term.  Deliveries of gas shall commence on November 1, 2004 and
         continue through October 31, 2007.

5.       Billing and Payments.

         (A)Billing and payment procedures are as follows:

              (i)After the delivery of gas has commenced hereunder, Seller
                 shall, on or about the tenth day of each month, render to Buyer
                 a statement showing the estimated (or actual if available)
                 quantity of gas delivered at each Point of Delivery during the
                 prior month, and the amounts due Seller hereunder. Seller shall
                 also render to Buyer, if necessary, a separate statement
                 showing the adjustment, if any, required to conform the prior
                 month's estimated and actual deliveries and prices. Payment of
                 the amount due based on such statements shall be made by Buyer
                 to Seller by wire transfer with immediately available funds the
                 later of (a) ten (10) days following receipt of such statement
                 or (b) the twentieth (20th) day of the month. If the due date
                 falls on a day which is not a business day, then payment shall
                 be made on the next business day. If the Buyer bills Seller the
                 same procedure shall be followed as set forth in this
                 subparagraph.
<PAGE>   7
            (ii) In the event that either Party shall in good faith dispute any
                 portion of the amount shown in the other Party's statement
                 (hereinafter called the "Disputed Amount"), the disputing Party
                 shall (a) notify the other Party in writing as to the Disputed
                 Amount, and (b) pay the remaining undisputed portion of the
                 other Party's statement when due (hereinafter, the "Undisputed
                 Amount").

            (iii)If it is determined that the failure to pay any Undisputed
                 Amount of any statement was not justifiable, interest on such
                 Undisputed Amount shall accrue at a rate per annum equal to the
                 Prime Rate, plus one percent (1.0%), from the time payment
                 would have been due until the time payment is made, but in no
                 event shall the interest on such unpaid portion exceed the
                 applicable lawful nonusurious rate of interest. Payment of any
                 previously unpaid Undisputed Amount shall be credited first to
                 all interest accrued and then to principle.

         (B)Each Party hereto shall have the right, upon reasonable written
            notice, during normal business hours and at its own expense to
            examine the books and records of the other Party to the extent
            necessary to verify the accuracy of any statement, charge,
            computation or demand made under or pursuant to this Agreement. Such
            examination shall be conducted no more than once in a twelve-month
            period. Any error or discrepancy in statements furnished

<PAGE>   8

            pursuant to this Agreement shall be promptly reported to Seller or
            Buyer, as applicable, and proper adjustment thereof shall be made
            within thirty (30) days after final determination of the correct
            volumes or amounts involved; provided, however, that, if no such
            errors or discrepancies are reported to Seller or Buyer, as
            applicable, within two (2) years from the end of the calendar year
            in which such errors or discrepancies occurred, the same shall be
            conclusively deemed to be correct.

6.   Deliveries.

         (A)Exhibit A hereto sets forth the Point(s) of Delivery under this
            Agreement. Seller shall not use any other point to deliver gas
            without Buyer's written consent which Buyer may grant or withhold in
            its sole discretion.

         (B)To the extent that the procedures for the delivery of gas set forth
            herein conflict with the rules and tariffs of any Transporter, the
            Transporter's rules and tariffs will control and the Parties shall
            cooperate fully with each other in complying with such rules and
            tariffs.

         (C)For the period November 1, 2004 to October 31, 2005 Engage shall
            designate the Point of Delivery for the entire coming month to MCV
            no later than two days prior to the last day on which gas futures
            contracts are traded on the NYMEX for delivery (at the Henry Hub)
            for such coming month. Should Engage fail to timely designate a
            Point of
<PAGE>   9

            Delivery for any of the delivery months during that period, then for
            such delivery month, the Point of Delivery shall be Emerson.

7.       Third Party Gas. Buyer understands and agrees the gas delivered
         hereunder may be supplied either from Seller's gas or from gas
         purchased by Seller from third parties, provided however, if such gas
         is purchased from third parties, Seller shall be solely responsible for
         the payment of the purchase price of gas to such third parties.

8.       Title. Title and risk of loss to gas delivered hereunder shall pass
         from Seller to Buyer at the Point of Delivery.

9.       Delivery Pressure. All gas shall be delivered at the prevailing
         pressure of the delivering pipeline.

10.      Quality of Gas. The gas to be delivered hereunder shall comply with the
         quality requirements of GLGT.

11.      Measurement and Tests of Gas. The quantity and quality of gas delivered
         to the Buyer's account at the Point of Delivery shall be determined by
         GLGT in accordance with the then current standard terms and conditions
         applicable to GLGT's gas transportation contracts.

12.      Warranty of Title. Seller hereby warrants (i) title to all gas sold
         hereunder or the right to sell such gas, (ii) that it has the right to
         sell same to Buyer and (iii) that all such gas shall be free from any
         and all liens and adverse claims of any nature whatsoever. Seller
         agrees to indemnify and hold Buyer harmless, including but not limited
         to, all costs, damages and expenses (including Buyer's reasonable
         attorney fees) incurred by Buyer

<PAGE>   10

         in defending against any liens or adverse claims of any nature
         whatsoever, including but not limited to, third parties from whom
         Seller purchased gas as permitted in Section 7, in addition to any
         other remedies Buyer may have hereunder or at law.

13.      Credit Worthiness.

         13.1     This Agreement is subject to Seller providing Buyer a guaranty
                  from The Coastal Corporation in the form attached hereto as
                  Exhibit "B."

         13.2     At any time, and from time to time during the term of this
                  Agreement (and notwithstanding whether an Event of Default has
                  occurred, as defined in Section 23) but not more than once in
                  any seven (7) day period, if the Termination Payment (as such
                  term is defined in Section 13.5) should exceed $4,000,000
                  until November 1, 2004 and $5,000,000 thereafter as to MCV,
                  and $8,000,000 as to Seller, (the "Security Threshold"), then
                  either Party may request the other Party to provide additional
                  Performance Assurance in an amount equal to: the amount by
                  which the Termination Payment exceeds the Security Threshold
                  (rounding upwards for any fractional amount to the next
                  $100,000). The Performance Assurance shall be delivered within
                  thirty (30) calendar days of the date of the request. If such
                  additional Performance Assurance is not received by the
                  requesting Party within thirty (30) calendar days, then the
                  requesting Party in addition to any other remedy
<PAGE>   11
                   available, may immediately suspend performance with respect
                   to the quantities associated with the amount in excess of the
                   Security Threshold plus any Performance Assurance already in
                   place and cover such lost supply or market, as the case may
                   be. Incremental gas costs (as defined in Section 17 with
                   respect to either Buyer or Seller, as applicable) incurred by
                   the covering Party shall be recoverable from the other Party.
                   Such suspension will be implemented on a pro rata basis to a
                   level at which assurances have been provided. In addition, a
                   failure to provide Performance Assurance as requested shall
                   constitute an Event of Default under Section 23.

         13.3      Either Party, at its sole expense, may request the other
                   Party to reduce its Performance Assurance then in place, if
                   the Termination Payment (with respect to all Transactions
                   then outstanding) reverts back to an amount less than or
                   equal to the sum of the Performance Assurance and the
                   Security Threshold then in place (rounding upwards for any
                   fractional amount to the next $100,000). Such request for
                   reduction shall be no more frequently than weekly with
                   respect to Letters of Credit and guaranties, and daily with
                   respect to cash. The consent to such request(s) shall not be
                   unreasonably withheld.

         13.4      Either Party may at any time make a calculation of the
                   Termination Payment and submit same to the other Party for
                   review. If within

<PAGE>   12
                   thirty days of the submission of the value of the Termination
                   Payment from one Party to the other, agreement has not been
                   reached by the Parties as to the amount of the Termination
                   Payment, the determination of the amount of the Termination
                   Payment shall be submitted to arbitration as provided for in
                   Section 18 of this Agreement. Notwithstanding the submission
                   of the determination of the amount of the Termination Payment
                   to arbitration, all requirements in Section 13 of this
                   Agreement shall remain in effect.

         13.5      With respect to this Section 13: (a) "Performance Assurance"
                   means collateral in the form of either cash or Letters of
                   Credit. The requesting Party may also accept a parental
                   guaranty or other collateral deemed sufficient by the
                   requesting Party. If the collateral is in the form of cash,
                   then such cash shall be placed in a segregated,
                   interest-bearing escrow account on deposit with a major U.S.
                   commercial bank having a credit rating of at least "A-" from
                   Standard and Poor's or "A3" from Moody's (interest to accrue
                   to the Party posting the collateral); (b) "Letter of Credit"
                   means one or more irrevocable, transferable standby letters
                   of credit from a major U.S. commercial bank or foreign bank
                   with a U.S. office having a credit rating of at least "A-"
                   from Standard & Poor's or "A3" from Moody's; (c) "Termination
                   Payment" means the amount by which the requesting Party shall
                   aggregate Gains, Losses, and

<PAGE>   13
                   Costs (as those terms are defined in Section 23.2 (e)) with
                   respect to this Agreement into a single net amount. The
                   Termination Payment shall include all amounts owed but not
                   yet paid by one Party to the other Party, whether or not such
                   amounts are then due, for performance already performed
                   pursuant to any Transaction.

14.      Right to Terminate Agreement.

         (A)In addition to any other remedy of Buyer under law or provided
            under this Agreement, Buyer shall have the right at its election to
            terminate this Agreement upon twenty (20) days written notice to
            Seller if Seller, for any reason, other than (i) force majeure, (ii)
            Buyer's failure to take, or (iii) a failure by Buyer to pay any
            Undisputed Amounts, fails, over a period of at least sixty (60)
            days, to deliver an average of ninety percent (90%) of the agreed
            quantity and provided further that such failure occurred not more
            than one hundred forty (140) days immediately preceding the giving
            of such notice of termination. Seller shall have twenty (20) days
            after receipt of such cancellation notice to cure any failure in
            which case Buyer's cancellation is null and void and this Agreement
            shall remain in full force and effect.

         (B)In addition to the other remedies of Seller under law or provided
            under this Agreement, Seller shall have the right at its election to
            terminate this Agreement upon twenty (20) days written notice to
            Buyer if Buyer, for any reason, other than (i) force majeure, (ii)
            Seller's failure to
<PAGE>   14
            deliver, or (iii) a failure by Seller to pay any Undisputed Amounts,
            fails, over a period of at least sixty (60) days, to take a volume
            of gas not less than an average of ninety percent (90%) of the
            agreed quantity, and provided further that such failure occurred not
            more than one hundred forty (140) days immediately preceding the
            giving of such notice of termination. Buyer shall have twenty (20)
            days after receipt of such cancellation notice to cure any failure
            in which case Seller's cancellation is null and void and this
            Agreement shall remain in full force and effect.

15.      Assignment.

         (A)The terms, covenants and conditions hereof shall be binding on the
            Parties hereto and on their successors and permitted assignees.

         (B)Either Party may assign its interest under this Agreement, with the
            consent of the other Party, which consent shall not be unreasonably
            withheld, to an affiliate or any company which shall succeed, by
            merger or consolidation, to substantially all of its assets. In the
            event of any such assignment, such successor shall be entitled to
            the rights and shall be subject to the obligations of its
            predecessor. Seller acknowledges that pursuant to a certain Gas
            Backup Agreement among Consumers Power Company, The Dow Chemical
            Company (Dow) and the Midland Cogeneration Venture Limited
            Partnership dated January 27, 1987, Buyer may be required to make an
            assignment to Dow of certain rights under this Agreement. Seller
<PAGE>   15
            specifically agrees to accept such assignments, if any, made by
            Buyer to Dow in accordance with the aforementioned Gas Backup
            Agreement; provided, however, that such assignment shall not relieve
            Buyer of its obligations under this Agreement absent Seller's
            written consent.

         (C)Except as provided above, neither Party shall assign this Agreement
            without the prior consent of the other Party, which consent shall
            not be unreasonably withheld. Nothing herein contained shall prevent
            or restrict either Party from pledging, granting a security interest
            in, or assigning as collateral all or any portion of such Party's
            interest to secure any debt or obligation of such Party under any
            mortgage, deed of trust, security agreement or similar instrument.

         (D)Either Party desiring to make an assignment for which it has the
            right pursuant to the foregoing may upon request obtain a written
            consent within sixty (60) days to such assignment from the other
            Party evidencing its consent.

16.      Notices. Except as otherwise herein provided, any notice, request,
         demand or statement given in writing or required to be given in writing
         by the terms of this Agreement shall be deemed given when deposited in
         the government mail, postage prepaid, as certified mail, directed to
         the post office address of the Parties as follows:

<PAGE>   16
         TO SELLER:

         For Invoices and Payments: Engage Energy US, L.P.
                                    Five Greenway Plaza, Ste. 1200
                                    Houston, Texas  77046
                                    Attn.:  Client Services
                                    Telephone:  (713) 877-7800
                                    Telecopier:  (713) 297-1489
                                    Wire Transfer No. Citibank, NA, NY, NY,
                                    Acct. # 4071-9415, ABA # 0210-00089

         For all other notices:     Engage Energy US, L.P.
                                    Five Greenway Plaza, Ste. 1200
                                    Houston, Texas  77046
                                    Attn.:  Contract Administration
                                    Telephone:  (713) 877-7800
                                    Telecopier:  (713) 877-3583

         TO BUYER:

         For Invoices and Payments: Midland Cogeneration Venture
                                    Limited Partnership
                                    Attn.:  Treasury
                                    100 Progress Place
                                    Midland, MI  48640
                                    Telephone No.:  (517) 839-6018
                                    Telecopier:  (517) 839-6137
                                    Wire Transfer:  U.S. Bank Trust, N.A.
                                    Minneapolis, MN
                                    ABA#     091000022
                                    A/C#     180121167365
                                    MI Clearing #47300196 - FBO MCV 76608640

         For all other notices:     Midland Cogeneration Venture
                                    Limited Partnership
                                    100 Progress Place
                                    Midland, MI  48640
                                    Attn.:  Gas Supply Department
                                    Telephone No.:  (517) 839-6008
                                    Telecopier:  (517) 839-6793
<PAGE>   17
         or at such other address as either Party may from time to time specify
         as its address for such purposes by registered for certified letter
         addressed to the other Party. Notices, requests, demands or statements
         made in person, by telephone, Telecopier, Telex or wire shall be deemed
         given when received provided, however, that if such notices are
         received after 5:00 p.m. (recipient's local time), they shall not be
         effective until the next business day.

         Gas nomination notices will be in accordance with the terms and
         conditions applicable to Great Lakes Pipeline.

17.      Remedies. In the event Seller fails to deliver the daily quantities for
         reasons not otherwise excused by force majeure, Seller shall be
         responsible for any incremental gas costs incurred by MCV in replacing
         such gas. MCV agrees to use commercially reasonable efforts to purchase
         replacement gas at the lowest available price. Seller's obligation to
         pay MCV for incremental replacement gas costs (and any transportation
         penalties or transportation demand charges resulting from unused
         transportation) shall be MCV's sole and exclusive remedy for Seller's
         failure to deliver except as provided in Section 14. In the event that
         MCV fails to take gas for reasons not otherwise excused by force
         majeure, MCV shall pay Seller for any incremental decrease in the
         resale price of such gas. Seller agrees to use commercially reasonable
         efforts to resell such deficiency gas at the highest achievable price.
         MCV's obligation to pay Seller for such decrease (and any
         transportation

<PAGE>   18
         penalties or transportation demand charges resulting from unused
         transportation) shall be Seller's sole and exclusive remedy for MCV's
         failure to take gas except as provided in Section 14.

18.      Arbitration

         (A)If the Parties are unable to resolve a disagreement arising under
            this Agreement such disagreement shall be settled by arbitration.
            Either Party may then commence arbitration by serving written notice
            thereof on the other Party designating the issue to be arbitrated.

         (B)The Parties shall each appoint one (1) arbitrator and the two (2)
            arbitrators so appointed will select a third arbitrator, all of such
            arbitrators to be qualified by education, knowledge, and experience
            to resolve the dispute or controversy. If either Party fails to
            appoint an arbitrator within ten (10) days after a request for such
            appointment is made by the other Party in writing, or if the two (2)
            appointed fail, within ten (10) days after the appointment of the
            second, to agree on a third arbitrator, the arbitrator or
            arbitrators necessary to complete a board of three (3) arbitrators
            will be appointed upon application by either Party therefor to the
            American Arbitration Association.

         (C)The jurisdiction of the arbitrators will be limited to the single
            issue referred to arbitration and the arbitration shall be conducted
            pursuant to the guidelines set forth by the American Arbitration
            Association; provided, however, that should there be any conflict
            between such

<PAGE>   19
            guidelines and the procedures set forth in this Agreement, the terms
            of this Agreement shall control.

         (D)Within fifteen (15) days following selection of the third
            arbitrator, each Party shall furnish the arbitrators in writing its
            position regarding the issue being arbitrated. The arbitrators may,
            if they deem necessary, convene a hearing regarding the issue being
            arbitrated. Within thirty (30) days following the later of the
            appointment of the third arbitrator or of the hearing, if one is
            held, the arbitrators shall notify the Parties in writing as to
            which of the two (2) positions submitted is most consistent with the
            meaning of this Agreement with respect to the issue being
            arbitrated. No other position may be selected. Such decision shall
            be binding on the Parties hereto and shall remain in effect until
            and unless changed in accordance with the provisions of this
            Agreement.

         (E)Enforcement of the award may be entered in any court having
            jurisdiction over the Parties.

         (F)Each Party will pay the expenses of the arbitrator selected by or
            for it, and its counsel, witnesses and employees. All other costs of
            arbitration will be equally divided between Parties.

         (G)This subsection shall apply only to the issue of selecting a
            replacement index for the NYMEX (delivery at Henry Hub). In the
            event that Buyer and Seller cannot agree on a replacement index
            within thirty (30) days, either Party may request the matter be
<PAGE>   20
            submitted to an expert for determination by providing the other
            Party with written notice of its election. In such event, the
            Parties shall attempt to agree upon a single expert with academic
            training and industry experience relevant to determining the matter
            in dispute. If the Parties are unable to agree upon a single expert
            within 30 days after the date of the notice of election, each Party
            shall select an expert and the two selected experts shall together
            select a third expert to serve on a panel to determine the disputed
            matter. The Parties shall each submit to the expert (or panel of
            experts, as applicable) all relevant information concerning the
            disputed matter within 30 days after the selection of the last
            expert. The final decision of the expert (or panel of experts, as
            applicable) shall be delivered to the Parties in writing, shall
            constitute the final resolution of all matters so determined, and
            shall be binding upon the Parties. Unless the expert (or panel of
            experts, as applicable) directs otherwise, the fees of the expert
            (or panel of experts, as applicable) and the cost of conducting the
            investigation shall be shared equally by the Parties. Each Party
            shall bear its own costs and expenses and those of counsel.
            Enforcement of the decision may be entered in any court having
            jurisdiction over the Parties.

19.      Force Majeure. The term "force majeure" as employed herein for all
         purposes relating hereto, shall mean acts of God, strikes, lockouts or
         other industrial disturbances, acts of public enemy, wars, blockades,
<PAGE>   21
         insurrections, riots, epidemics, landslides, lightning, earthquakes,
         hurricanes, explosions, fires, arrests and restraints of governments
         and people, civil disturbance, freeze-up of Seller's wells or wells
         from which Seller is furnishing gas hereunder, or other temporary
         inability of Seller's wells or wells from which Seller is furnishing
         gas hereunder to produce, mechanical breakdowns or repairs of MCV's
         plant or pipeline facilities or those of any Transporter used to
         transport gas hereunder, inability of any Party hereto to obtain
         necessary materials, supplies or permits due to existing or future
         rules, regulations, orders, laws or proclamations of governmental
         authorities (federal, state or local), including both civil and
         military, and any other causes whether of the kind herein enumerated or
         otherwise, not within the control of the Party claiming suspension and
         which by the exercise of due diligence such Party is unable to prevent
         or overcome.

20.      Transportation. Both Parties shall cooperate in an effort to eliminate
         imbalances on either Party's transporting pipeline(s). The Parties
         further agree that if any imbalance penalties or charges (including
         cash out charges) are imposed on a Party as a result of the other
         Party's failure to deliver or accept the required quantities, then the
         failing Party shall reimburse the non-failing Party for such charges or
         penalties.

21.      Law. THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUCTED ACCORDING TO
         THE LAWS OF THE STATE OF MICHIGAN.
<PAGE>   22
22.      Miscellaneous.

         (A)No waiver by either Seller or Buyer of any default by the other
            under this Agreement shall operate as a waiver of any future
            default, whether of like or different character or nature.
         (B)The descriptive headings of particular provisions of this Agreement
            are for the purpose of facilitating administration and shall not be
            construed as having any substantive effect on the terms of this
            Agreement.

         (C)The Parties agree to proceed with due diligence and make good faith
            effort to obtain such governmental authorizations as may be
            necessary to enable performance of this Agreement.

         (D)This Agreement is subject to the January 27, 1987 Gas Supply Option
            between Buyer and Dow and to Dow's rights under a certain Gas Backup
            Agreement with Buyer and Consumers Power Company dated January 27,
            1987.

         (E)If any provision of this Agreement is determined to be invalid,
            void or unenforceable by any court having jurisdiction, such
            determination shall not invalidate, void or make unenforceable any
            other provision of this Agreement.

         (F)Neither Buyer nor Seller shall disclose to any third Party other
            than its partners, parents, affiliates, directors, officers,
            employees, consultants, representatives, agents or those third
            parties providing financing to it, any information received from the
            other Party that is
<PAGE>   23

            explicitly marked "Confidential" (such information hereinafter
            referred to as ("Confidential Information"); provided however, that
            nothing shall be deemed Confidential Information which

               (i)   is part of the public domain;

               (ii)  becomes publicly known otherwise than through an action or
                     inaction of the receiving Party;

               (iii) is independently developed by the receiving Party; or

               (iv)  is required to be disclosed pursuant to any law, rule, or
                     regulation, or pursuant to any order of a governmental
                     instrumentality, provided that the Party receiving the
                     order shall, if feasible, notify the other Party of any
                     such requirement at least ten (10) days before compliance
                     is required, and if so requested by the other Party, shall
                     use reasonable efforts to oppose the required disclosure,
                     as appropriate under the circumstances, or to otherwise
                     make such disclosure pursuant to a protective order or
                     other similar arrangement for confidentiality.

         (G)This Agreement may be amended only by a written instrument executed
            by the Parties hereto. This Agreement, Point(s) of Delivery (Exhibit
            A attached hereto), the Guaranty (Exhibit B attached hereto), and
            the Consent and Agreement (Exhibit C attached hereto) contain the
            entire understanding of the Parties with respect to the matter
<PAGE>   24
            contained in said documents. There are no promises, covenants or
            undertakings other than those expressly set forth in said documents.

         (H)Buyer represents and warrants that it has full and complete
            authority to enter into and to perform this Agreement. Seller
            represents and warrants that it has full and complete authority to
            enter into and to perform this Agreement. Each person who executes
            this Agreement on behalf of Buyer represents and warrants that he or
            she has full and complete authority to do so and that Buyer will be
            bound thereby. Each person who executes this Agreement on behalf of
            Seller represents and warrants that he or she has full and complete
            authority to do so and that Seller will be bound thereby.

         (I)Notwithstanding anything to the contrary contained in this
            Agreement, the liabilities and obligations of MCV arising out of, or
            in connection with, this Agreement or any other agreements entered
            into pursuant hereto shall not be enforced by any action or
            proceeding wherein damages or any money judgment or specific
            performance of any covenant in any such document and whether based
            upon contract, warranty, negligence, indemnity, strict liability or
            otherwise, shall be sought against the assets of the partners of
            MCV. By entering into this Agreement, Seller waives any and all
            right to sue for, seek or demand any judgment against such partners
            and their affiliates, other than MCV by reason of the performance by
            MCV of its obligations under this Agreement or any other agreements
            entered into pursuant
<PAGE>   25
            hereto, except to the extent such partners are legally required to
            be named in any action to be brought against MCV.

23.      Defaults and Remedies.

         23.1  Event of Default. A Party shall be deemed in default under this
               Agreement upon the occurrence of any one or more of the following
               events ("Events of Default"):

               (a)  The unexcused failure by a Party (the "Defaulting Party") to
                    make, when due, any payment required pursuant to this
                    Agreement if such failure is not remedied within three (3)
                    business days after written notice of such failure is given
                    to the Defaulting Party by the other Party (the
                    "Non-Defaulting Party") and provided the payment is not a
                    Disputed Amount as described in Section 5(A)(ii);

               (b)  Any representation or warranty made by a Party herein shall
                    at any time during the term of this Agreement prove to be
                    false or misleading in any material respect;

               (c)  The failure by a Party to perform, in any material respect,
                    any material covenant or provision set forth in this
                    Agreement (other than (i) the events that are otherwise
                    specifically covered in this Section 23.1 as a separate
                    Event of Default and (ii) the events that are covered in
                    Sections 14 and 17) and such failure is not cured within
                    five (5) business days (or such longer period of time if
                    reasonably necessary
<PAGE>   26
                    to cure the failure and the Defaulting Party is making
                    continuous and diligent efforts to cure) after written
                    notice thereof to the Defaulting Party unless such failure
                    is excused by force majeure;

               (d)  A Party becomes subject to a bankruptcy, insolvency,
                    reorganization, assignment for the benefit of creditors or
                    similar proceeding; or

               (e)  The failure of a Party, upon the occurrence of a Material
                    Adverse Change, to provide, for so long as the Material
                    Adverse Change is occurring, adequate assurance (in the form
                    of cash or a Letter of Credit to be provided at the election
                    of the Defaulting Party or a guaranty deemed acceptable by
                    the Non-Defaulting Party which such acceptance of such
                    guaranty may not be unreasonably withheld) of its ability to
                    perform all of its outstanding obligations to the
                    Non-Defaulting Party under this Agreement, within a period
                    not to exceed three (3) business days of the Defaulting
                    Party's receipt, in accordance with the notice provisions of
                    Section 16, of a demand therefore by the Non-Defaulting
                    Party.

               The term "Material Adverse Change" shall mean: (i) with respect
               to The Coastal Corporation, having consolidated net worth of less
               than $2.0 billion as presented in its financial statements, and
               (ii)

<PAGE>   27
               with respect to MCV having less than $60 million of its Cash
               Reserves as reported in the Liquidity Section of Midland
               Cogeneration Venture's annual 10K report and quarterly 10Q
               report. Cash Reserves equal the total cash reserves as reported
               less the funds restricted for rental payments (presently
               $137,000,000) and funds restricted for management non-qualified
               plans (presently $0).

23.3     Remedies Upon an Event of Default.

         (a)If an Event of Default occurs with respect to a Defaulting Party at
            any time during the term of this Agreement, the Non-Defaulting Party
            shall have the right, for so long as the Event of Default is
            continuing, to (i) establish a date (which date shall be between 5
            and 10 business days after the Non-Defaulting Party delivers written
            notice to the Defaulting Party of its intent to exercise the remedy
            described herein) ("Early Termination Date") on which this Agreement
            shall terminate and (ii) withhold any payments due; provided,
            however, upon the occurrence of any Event of Default listed in item
            (d) of Section 23.1 as it may apply to any Party, this Agreement in
            respect thereof shall automatically terminate, without notice, and
            without any other action by either Party as if an Early Termination
            Date had been declared immediately prior to such event.

<PAGE>   28

         (b)If an Early Termination Date has been designated, the
            Non-Defaulting Party shall in good faith calculate its Gains, Losses
            and Costs resulting from the termination of this Agreement. The
            Gains, Losses and Costs shall be determined by comparing the value
            of the remaining term, Contract Quantities and Contract Prices under
            this Agreement had it not been terminated, to the equivalent
            quantities and relevant market prices for the remaining term either
            quoted by a bona fide third-party offer or which are reasonably
            expected to be available in the market under a replacement contract
            for the balance of this Agreement. To ascertain the market prices of
            a replacement contract, the Non-Defaulting Party may consider, among
            other valuations, settlement prices of NYMEX natural gas futures
            contracts, quotations from leading dealers in natural gas swap
            contracts and other bona fide third party offers, all adjusted for
            the length of the remaining term and differences in transportation.
            It is expressly agreed that a Party shall not be required to enter
            into replacement transactions in order to determine the Termination
            Amount (as hereinafter defined.)

         (c)The Non-Defaulting Party shall aggregate such Gains, Losses and
            Costs with respect to the balance of this Agreement into a single
            net amount ("Termination Amount"). The Non-Defaulting Party shall
            provide the Defaulting Party with a notice and

<PAGE>   29
            statement containing a clear identification and calculation of the
            Termination Amount owed by or due to the Defaulting Party and shall
            be accompanied by sufficient information to enable the Defaulting
            Party to determine the basis upon which the calculation was made and
            the accuracy thereof. If the Non-Defaulting Party's aggregate Losses
            and Costs exceed its aggregate Gains, the Defaulting Party shall,
            within five (5) business days of receipt of such statement, pay the
            Termination Amount to the Non-Defaulting Party, which amount shall
            bear interest at the interest rate as set forth in Section 5(A)(iii)
            above, from the Early Termination Date until paid. If the
            Non-Defaulting Party's aggregate Gains exceed its aggregate Losses
            and Costs, if any, resulting from the termination of this Agreement,
            the Non-Defaulting Party shall pay such excess to the Defaulting
            Party on or before the latter of: (i) twenty (20) days after the end
            of the month ending on or after the Early Termination Date, and (ii)
            five (5) business days after receipt by the Defaulting Party of the
            Non-Defaulting Party's notice of the Termination Amount, which
            amount shall bear interest at the interest rate as set forth in
            Section 5(A)(iii) above, from the Early Termination Date until paid.

         (d)If the Defaulting Party disputes the Non-Defaulting Party's right
            to terminate this Agreement or disagrees with its calculation of

<PAGE>   30
            the Termination Amount, in whole or in part, the Defaulting Party
            shall, within three (3) business days of receipt of the
            Non-Defaulting Party's calculation of the Termination Amount,
            provide to the Non-Defaulting Party a detailed written explanation
            of the basis for such dispute or disagreement and, if the
            Termination Amount is due from the Defaulting Party, shall promptly
            pay to the Non-Defaulting Party such portion thereof as is conceded
            to be correct. Upon receipt of the Defaulting Party's explanation,
            the Parties shall seek to resolve the issues in accordance with
            mutually agreeable dispute resolution procedures.

         (e)As used herein in this Section 23.2, with respect to each Party:
            (i) "Costs" shall mean reasonable brokerage fees, commissions and
            other similar transaction costs and expenses reasonably incurred by
            a Party either in terminating or entering into new arrangements
            which replace this Agreement, and reasonable attorney's fees, if any
            reasonably incurred in connection with enforcing its rights under
            this Agreement; (ii) "Gains" shall mean an amount equal to the
            present value (calculated using the interest rate as set forth in
            Section 5(A)(iii) above as the prevailing discount rate) of the
            economic benefit (exclusive of Costs), if any, to a Party resulting
            from the termination of its obligations with respect to this
            Agreement, determined in a

<PAGE>   31
            commercially reasonable manner; and (iii) "Losses" shall mean an
            amount equal to the present value (calculated using the interest
            rate as set forth in Section 5(A)(iii) above as the prevailing
            discount rate) of the economic loss (exclusive of Costs), if any, to
            a Party from the termination of its obligations with respect to this
            Agreement, determined in a commercially reasonable manner. In no
            event, however, shall a Party's Costs, Gains or Losses include any
            costs or expenses incurred by a Party in terminating or
            re-establishing any arrangement pursuant to which it has hedged its
            obligations under this Agreement.

24.  Limitations: NEITHER PARTY HERETO SHALL BE LIABLE TO THE OTHER PARTY FOR
     ANY CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES ARISING OUT OF, OR
     RELATED TO, A BREACH OF THIS AGREEMENT.

         IN WITNESS WHEREOF, this Agreement is executed in multiple originals
effective as of the day and year first herein above written.

         BUYER                 MIDLAND COGENERATION VENTURE
                               LIMITED PARTNERSHIP
                               By: LeRoy W. Smith

                               Name:  LeRoy W. Smith

                               Title:  V.P. Gas Supply

         SELLER                ENGAGE ENERGY U.S., L.P.
<PAGE>   32
                               By: Clark C. Smith

                               Name: Clark C. Smith

                               Title: President & CEO

<PAGE>   33
                                    EXHIBIT A
                              POINT(S) OF DELIVERY

For the period November 1, 2004 to October 31, 2005:

         Great Lakes Gas Transmission - Midland Interconnect located in Isabella
         County, Michigan (Midland),

         or

         Great Lakes Gas Transmission - Interconnect with TransCanada PipeLines
         Limited located near Emerson, Manitoba (Emerson)

For the period November 1, 2005 to October 31, 2007:

         Great Lakes Gas Transmission - Midland Interconnect located in Isabella
         County, Michigan (Midland).
<PAGE>   34

                                    EXHIBIT B

                                    GUARANTY

         Guaranty dated effective as of the 1st day of January, 2000, by The
Coastal Corporation, a Delaware corporation (hereinafter referred to as the
"Guarantor"), in favor of Midland Cogeneration Venture Limited Partnership, a
Michigan limited partnership (hereinafter referred to as "Creditor").
         WHEREAS, Creditor and Engage Energy US, L.P. (hereinafter referred to
as "Debtor") have entered into a certain Gas Sales Agreement dated September 20,
1999 (hereinafter referred to as the "Contract"); and
         WHEREAS, as a condition precedent to Creditor's entering into the
Contract, Guarantor has agreed to provide this Guaranty as provided herein;
         NOW, THEREFORE, for and in consideration of the premises, Guarantor
hereby agrees as follows:

1.   Guaranty. Guarantor unconditionally guarantees to Creditor the payment of
     amounts due and payable by Debtor pursuant to the Contract up to a maximum
     amount in the aggregate of $3,000,000 (such obligations being hereinafter
     referred to as the "Obligations"); provided, however, that as to
     Obligations which Guarantor is called upon to honor, Guarantor is and shall
     be entitled to assert any and all claims, counterclaims, defenses, offsets
     and other rights which Debtor could assert against Creditor with respect to
     the Obligations, except as provided in paragraph 7 below. In the event
     Debtor defaults in the payment of any of the Obligations, after thirty days
     written

<PAGE>   35

     notice to Guarantor at the address provided below, Guarantor shall make
     such payment or otherwise cause same to be paid. Guarantor's Obligations
     are subject to its receiving from Creditor copies of any and all notices of
     defaults and events of default given by Creditor to Debtor pursuant to the
     Contract in the same manner and at the same time as such notices are given
     by Creditor to Debtor, except to Guarantor's address for notice set forth
     in this Guaranty.
2.   Termination. This Guaranty is continuing and irrevocable and shall remain
     in full force and effect until such time as all of the Obligations have
     been fully satisfied, performed and discharged.
3.   Waivers. Except as is otherwise provided in this Guaranty, Guarantor waives
     notice of acceptance of the guaranty contained herein, presentment, demand,
     notice of dishonor, protest and notice of protest, and prosecution of
     litigation in connection with the Obligations.
4.   Assignment. Neither Guarantor nor Creditor may assign its respective rights
     or obligations under this Guaranty without the other's written consent.
     Subject to the foregoing, this Guaranty shall be binding upon and inure to
     the benefit of the parties hereto and their respective successors,
     permitted assigns, and legal representatives.
5.   Notices. Any notice or other communication required or permitted to be
     given to Guarantor under this Guaranty shall be deemed to have been given
     when delivered personally or otherwise actually received or on the tenth
     (10th) day after being deposited in the United States mail if registered or

<PAGE>   36

     certified, postage prepaid, or one (1) day after delivery to a nationally
     recognized overnight courier service, fee prepaid, return receipt
     requested, if in writing and addressed as follows: The Coastal Corporation,
     Nine Greenway Plaza, Houston, Texas 77046, Attention: Secretary.

6.   Applicable Law. This Guaranty shall in all respects be governed by,
     enforced under and construed in accordance with the laws of the State of
     Texas.

7.   Effect of Certain Events. Guarantor agrees that Guarantor's liability
     hereunder will not be released, reduced, impaired or affected by the
     occurrence of any one or more of the following events:

     a.   The insolvency, bankruptcy, reorganization, or disability of Debtor;
     b.   The renewal, consolidation, extension, modification, or amendment from
          time to time of the Contract;
     c.   The failure, delay, waiver, or refusal by Creditor to exercise any
          right or remedy held by Creditor with respect to the Contract;
     d.   The sale, encumbrance, transfer or other modification of the ownership
          of Debtor or the change in the financial condition or management of
          Debtor.

     IN WITNESS WHEREOF, Guarantor has duly executed this Guaranty effective as
of the date first written above.

                                             THE COASTAL CORPORATION

                                             BY: J.B. Levos

                                             Vice President and Controller

<PAGE>   37
                                    EXHIBIT C

                              CONSENT AND AGREEMENT

         CONSENT AND AGREEMENT, dated as of September 20, 1999, made by Engage
Energy U.S., L P, a Delaware limited partnership, (the "undersigned") to the
parties whose names appear on Schedule A attached hereto (the "Transaction
Parties"), provides as follows:

         1. Midland Cogeneration Venture Limited Partnership ("MCV"), and the
undersigned entered into the Gas Sales Agreement, dated September 20, 1999, as
the same may be amended, modified or supplemented from time to time in
accordance with the provisions thereof and of this Consent and Agreement (the
"Contract"). MCV was the owner of an approximately 1370 MW gas-fired
cogeneration facility in Midland, Michigan (the "Facility"). Pursuant to several
separate Participation Agreements, each dated as of June 1, 1990, MCV sold and
leased-back several separate Undivided Interests in the Facility under several
separate Leases each having a basic term of 25 years. The general structure of
the sale and lease-back transactions is described in more detail in Schedule B
attached hereto.

         2. The undersigned hereby acknowledges notice of the sale and
lease-back transactions described in Schedule B and receipt of a photocopy of
each Participation Agreement (including Appendix A thereto but excluding other
Appendices, Exhibits and Schedules referenced therein unless specifically
requested). Photocopies of the related Transaction Documents will be made
available by MCV to the undersigned at its request for inspection. The
undersigned further acknowledges and consents to the assignments of and Liens on
the Contract pursuant to the Transaction Documents related to each sale and
lease-back transaction, and hereby agrees with each of the Transaction Parties
(provided, however, that each of the Indenture Trustees will have the rights set
forth herein only until the undersigned receives written notice from such
Indenture Trustee that the related Undivided Interest in the Facility is no
longer subject to the Lien of the Indenture to which such Indenture Trustee is a
party and the Secured Notes issued pursuant to such Indenture have been paid in
full) that:

                  (a) Each Owner Trustee and each related Indenture Trustee
shall be entitled, after a Lease Event of Default or an Indenture Event of
Default under the Lease or the Indenture, as the case may be, to which such
Person is a party, to exercise any and all rights of MCV under the Contract in
accordance with the terms of the related Lease, the related Lessee Security
Agreement, the related Indentures and this Consent and Agreement, and the
undersigned will comply in all respects with such exercise by any of such
Persons.

<PAGE>   38

                  (b) The undersigned will give each owner Trustee and Indenture
Trustee prompt written notice of any default of which it has knowledge under the
Contract which, if not cured, would give the undersigned the right to suspend
its performance under, or to terminate, the Contract. Each Owner Trustee and
Indenture Trustee (and their respective designee(s)) shall have the right,
within 30 days (or such longer period, not to exceed 90 days, as may reasonably
be required to cure defaults other than defaults in respect to the nonpayment of
money by MCV) of receipt by each such Person of such written notice, to cure
such default.

                  (c) In the event any Owner Trustee or Indenture Trustee
succeeds to MCV's rights or interests under the Contract after a Lease Event of
Default or an Indenture Event of Default under the Lease or the Indenture, as
the case may be, to which such Person is a party, whether by foreclosure or
otherwise, such Person shall have the right to exercise all rights of MCV under
such Contract, and the undersigned will comply in all respects with such
exercise by such Person.

                  (d) The exercise of remedies under any Lease or foreclosure of
any Indenture, whether by judicial proceedings or under power of sale contained
in such Indenture or otherwise or any conveyance from MCV or any Owner Trustee
to either related Indenture Trustee in lieu thereof, following a Lease Event of
Default or Indenture Event of Default under the Lease or the Indenture, as the
case may be, to which such Person is a party, shall not require the further
consent of the undersigned.

         3. It is understood and agreed that the Contract and this Consent and
Agreement are subject to all tariffs and all Applicable Laws relating to such
services. Except as required, in the undersigned's reasonable opinion or by any
Applicable Law, the undersigned will not, without the prior written consent of
each Owner Trustee and Indenture Trustee (unless MCV delivers to the undersigned
a certificate stating that such consent is not required by the terms of the
related Transaction Documents), cancel, amend, modify or terminate or accept any
cancellation, amendment, modification or termination thereof, except if such
cancellation or termination is in accordance with the express terms of the
Contract, but subject to the rights of each Owner Trustee and Indenture Trustee
to cure any defaults and to keep the Contract in full force and effect as
provided in Section 2(b) above.

         4. In the event that any Owner Trustee or Indenture Trustee (or their
respective designee(s)) assumes the Contract or otherwise elects to perform the
duties of MCV under the Contract, such Person shall not have any personal
liability to the undersigned for the performance of MCV's obligations under the
Contract, it being understood that the sole recourse of the undersigned seeking

<PAGE>   39

enforcement of such obligations shall be to such Person's interest in the
Facility and the related rights and Revenues therefrom.

         5. If the Contract is rejected by a trustee or debtor-in-possession in
any bankruptcy, insolvency or similar proceeding involving any Persons other
than the undersigned, or is terminated for any other reason (except as a result
of a default which was not appropriately cured as provided herein and in the
Contract), and if, (i) within 30 days thereafter, MCV (in the case of a
bankruptcy, insolvency or similar proceeding involving any Owner Trustee or
Owner Participant), any Owner Trustee, Indenture Trustee or their respective
successors or assigns so request and (ii) all payment defaults under the
Contract have been cured, the undersigned will execute and deliver to the Person
or Persons making such request in proportion to their respective interests in
the Contract a new Contract for the services remaining to be performed under the
original Contract and containing the same terms and conditions as the original
Contract (except for any requirements which have been fulfilled prior to such
termination). Such new Contract also shall be subject to the terms of this
Consent and Agreement.

         6. The undersigned acknowledges that after the end of the respective
Lease Terms and during the respective Residual Terms, each Owner Trustee, as the
assignee of an Undivided Interest in the Contract pursuant to the related
Facility Agreements Assignment, shall have all of the rights and shall be liable
for all of the obligations (to the extent of its respective Undivided Interest
Percentage) on a non-recourse basis of MCV under the Contract. The undersigned
further acknowledges that MCV shall be the initial Operator of the Facility
under the Operating Agreement and further agree that the Owner Trustees may
appoint any Person to serve as a successor Operator thereunder so long as such
Person satisfies the requirements set forth in the Operating Agreement.

         7. No termination, amendment or waiver of any provision of this Consent
and Agreement or consent to any departure by the undersigned from any provision
of this Consent and Agreement shall be effective unless the same shall be in
writing and signed by the Owner Trustees, the Indenture Trustees and MCV and
then such waiver or consent shall be effective only in a specified instance for
the specific purpose for which it was given.

         8. This Consent and Agreement shall be governed by, and construed in
accordance with, the laws of the State of Michigan, and shall be binding on the
parties hereto and their respective successors and assigns.

<PAGE>   40

         IN WITNESS WHEREOF, the undersigned by its officers thereunto duly
authorized, have duly executed this Agreement as of the day and year first above
written.

                                             ENGAGE ENERGY U.S., L P

                                             By: Clark C. Smith

                                             Title: President & CEO

Seen and Agreed to this
18 day of October, 1999.

MIDLAND COGENERATION VENTURE
    LIMITED PARTNERSHIP, as
    Lessee

By: LeRoy W. Smith

Title: Vice President Energy Supply & Marketing

<PAGE>   41
                                   SCHEDULE A

MIDLAND COGENERATION VENTURE LIMITED PARTNERSHIP,
as Lessee,

FIRST MIDLAND LIMITED PARTNERSHIP,
DCC PROJECT FINANCE ONE, INC.,
EDISON CAPITAL (formerly, Mission Funding Epsilon),
BELL ATLANTIC CREDIT CORPORATION (formerly, NYNEX Credit Company),
RESOURCES CAPITAL MANAGEMENT CORPORATION,
as the several Owner Participants,

STATE STREET BANK AND TRUST COMPANY
(formerly, Fleet National Bank, Shawmut Bank Connecticut, National
Association, and The Connecticut National Bank),
not in its individual capacity but solely as Owner Trustee
under several separate Trust Agreements,

UNITED STATES TRUST COMPANY OF NEW YORK,
not in its individual capacity but solely as Senior Indenture Trustee
under several separate Senior Trust Indenture, Leasehold Mortgage
and Security Agreements for the benefit of the Senior Secured Notes,

FIRST UNION NATIONAL BANK
(formerly, Meridian Trust Company),
not in its individual capacity but solely as Subordinated Indenture Trustee
under several separate Subordinated Trust Indenture,
Leasehold Mortgage and Security Agreements
for the benefit of the Subordinated Secured Notes, and

MIDLAND FUNDING CORPORATION I AND
MIDLAND FUNDING CORPORATION II,
as purchasers of the Secured Notes.

<PAGE>   42

                                   SCHEDULE B

                  A. As described below, the Owner Participants named in
Schedule A acquired separate Undivided Interests in the Facility and leased such
Undivided Interests back to MCV through separate Owner Trustees acting on behalf
of separate Owner Trusts. The beneficial interest in each Owner Trust is held by
Owner Participant.

                  B. For purposes of this Schedule B and the Consent and
Agreement, capitalized terms used herein and not otherwise defined herein shall
have the meanings assigned to such terms in Appendix A to the several separate
Amended and Restated Participation Agreements (the "Participation Agreements"),
each dated as of June 1, 1990, to which MCV, an Owner Participant, the related
Owner Trustee, the related Indenture Trustees, the Funding Corporations, MDC and
the Institutional Senior Bond Purchasers named therein are parties. The rules of
usage set forth in such Appendices also shall apply hereto; provided, that when
the terms defined in Appendix A to a particular Participation Agreement as
relating only to the transaction contemplated therein are used in the plural
herein, such terms are intended to apply to the terms applicable to the
transactions contemplated by all Participation Agreements collectively. In
addition, the word "related", when used with respect to any Person, interest,
instrument, agreement or document, shall denote a Person which is a party to, or
an interest, instrument, agreement or document which is a part of, the
transaction contemplated in a particular Participation Agreement and the
Transaction Documents referred to in such Participation Agreement.

                  C. Pursuant to a related Participation Agreement, MCV sold and
transferred to each Owner Trustee, and each Owner Trustee acquired, subject to
Dow's Prior Rights and Consumers' Prior Rights, an Undivided Interest in the
Facility equal to the respective Undivided Interest Percentage of such Owner
Trustee (with the Undivided Interests in the Initial Assets having been sold and
transferred on the First Closing Date and the Undivided Interests in the Second
Closing Assets being sold and transferred on the Second Closing Date). Each
Owner Trustee leased its Undivided Interest in the Facility back to the Lessee
pursuant to a related Lease, under which MCV has the use, possession and control
of the Undivided Interest in the Facility for the related Lease Term (with the
Undivided Interests in the Initial Assets having been leased on the First
Closing Date and the Undivided Interests in the Second Closing Assets being so
leased on the Second Closing Date).

                  D. On the Second Closing Date, (i) MCV assigned to each Owner
Trustee a separate Undivided Interest in the Facility Agreements and the
Cogeneration Agreements pursuant to a related Facility Agreements Assignment

<PAGE>   43

and a related Cogeneration Agreements Assignment, respectively, (ii) each Owner
Trustee assumed the obligations of MCV under the PPA and the SEPA, to the extent
of its respective Undivided Interest Percentage, pursuant to a related
Cogeneration Agreements Assignment, (iii) pursuant to the related Lease, each
Owner Trustee subassigned its Undivided Interests in the Cogeneration Agreements
and Facility Agreements back to MCV for the respective Lease Term, subject to
the Lien of the related Indentures, and MCV, as lessee, accepted such
subassignment, and (iv) MCV granted to each Owner Trustee a Lien on, without
limitation, MCV's right, title and interest in the related Undivided Interests
in the Cogeneration Agreements and the Facility Agreements (and the Revenues
therefrom) as collateral security for the related Secured Obligations pursuant
to a related Lessee Security Agreement.

                  E. Each Owner Trustee, as provided in the related
Participation Agreement, financed a portion of the Purchase Price for its
Undivided Interest in the Facility with the proceeds of Senior Secured Notes
issued by it to Midland Funding Corporation I pursuant to a related Senior Trust
Indenture and related Subordinated Secured Notes issued by it to Midland Funding
Corporation II pursuant to a related Subordinated Trust Indenture, and Midland
Funding Corporation I and Midland Funding Corporation II purchased such Secured
Notes.

                  F. Each Owner Trustee granted to the related Indenture
Trustees Liens on, among other things, the Owner Trustee's Undivided Interests
in the Facility, the Cogeneration Agreements and the Facility Agreements, the
Site Interest and its interest in certain of the related Transaction Documents
as collateral security for the Owner Trustee's obligations under the related
Secured Notes.

                  G. On the Second Closing Date, the Funding Corporations issued
Bonds pursuant to a Senior Collateral Trust Indenture and a Subordinated
Collateral Trust Indenture, respectively, for the purpose of participating in
the payment of the Purchase Price for each Undivided Interest in the Facility
and acquiring the funds necessary to purchase the Senior Secured Notes and the
Subordinated Secured Notes pursuant to a related Participation Agreement. The
Funding Corporations secured their obligations under the Bonds by a pledge to
the related Collateral Trust Trustees of the related Secured Notes (and the
collateral security therefor) held by the Funding Corporations.

                  H. MCV, each Owner Trustee and Indenture Trustee and the
Working Capital Lender, on the Second Closing Date, entered into an
Intercreditor Agreement with the Collateral Agent providing for the deposit with
and disbursement of all Revenues from the Undivided Interests in the Project by
the Collateral Agent.

<PAGE>   44

                  I. MCV and each Owner Trustee also entered into an Operating
Agreement appointing MCV as the initial operator of the Project during the
respective Residual Terms, commencing on the Operation Commencement Date (as
such term is defined in the Operating Agreement).

                  J. On the Second Closing Date, in order to obtain necessary
working capital for the operation of the Facility, MCV obtained the Working
Capital Line from the Working Capital Lender and granted to the Working Capital
Lender first priority Liens on MCV's right, title and interest (as subassignee
of the separate Undivided Interests in the Cogeneration Agreements and the
Facility Agreements during the respective Lease Terms) in and to (i) all Earned
Receivables, (ii) its Natural Gas Inventory and (iii) the Gas Brokering
Contract.

                  K. Each Owner Trustee has agreed to reassign its Undivided
Interest in the Project (including the Undivided Interest in the Facility
Agreements) and the Site Interest back to MCV at the expiration of the related
Support Term.

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