Document:

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                                                                Exhibit 10.89.1

                                                                  EXECUTION COPY

                                  AMENDMENT ONE

     AMENDMENT ONE (this "AMENDMENT") dated as of August 17, 2000 by and among
(I) MIDWEST GENERATION, LLC, ("MIDWEST"), (II) EDISON MISSION ENERGY, ("EME"),
(III) EME/CDL TRUST, (the "LESSOR"), (IV) CITICORP DEL-LEASE, INC., (the
"INVESTOR"), (V) WILMINGTON TRUST COMPANY, (the "TRUSTEE"), (VI) CERTAIN
NOTEHOLDERS PARTY HERETO, (the "NOTEHOLDERS"), (VII) CITICORP NORTH AMERICA,
INC., (the "AGENT") and (VIII) CITICORP NORTH AMERICA, INC., (the "COLLATERAL
AGENT").

         WHEREAS, Midwest, EME, the Lessor, the Investor, the Trustee, the
Noteholders, the Agent and the Collateral Agent have entered into that certain
Participation Agreement, dated as of June 23, 2000 (as heretofore amended,
modified and supplemented, the "PARTICIPATION AGREEMENT"), which sets forth,
INTER ALIA, certain covenants of EME;

         WHEREAS, EME and Midwest desire to enter into the Leveraged Lease
Transaction (as defined herein); and

         WHEREAS, EME and Midwest have requested, and the Lessor, the Investor,
the Trustee, the Noteholders, the Agent and the Collateral Agent have agreed, to
amend certain provisions of the Participation Agreement so as to permit the
Leveraged Lease Transaction;

         NOW, THEREFORE, the parties hereto agree as follows:

         Section 1. DEFINITIONS. Except as otherwise defined in this Amendment,
terms defined in the Participation Agreement are used herein (and in the
introductions and recitals hereto) as defined therein.

         Section 2. AMENDMENT TO THE PARTICIPATION AGREEMENT. Subject to the
satisfaction of the conditions precedent specified in Section 3 below, but
effective as of the Amendment Effective Date, the Participation Agreement shall
be amended as follows:

     (a) APPENDIX A to the Participation Agreement shall be amended by adding
the following definitions:

         ""LEVERAGED LEASE OPERATIVE DOCUMENTS" shall mean the Operative
         Documents as defined in the Leveraged Lease Participation Agreement.

         "LEVERAGED LEASE PARTICIPATION AGREEMENT" shall mean, collectively, (i)
         the

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         Participation Agreement dated as of August 17, 2000 by and among
         Midwest, Edison Mission Energy, Powerton Trust I, Powerton Generation
         I, LLC, Wilmington Trust Company, United States Trust Company of New
         York, as Lease Indenture Trustee and United States Trust Company of New
         York, as PassThrough Trustees; (ii) the Participation Agreement dated
         as of August 17, 2000 by and among Midwest, Edison Mission Energy,
         Powerton Trust II, Powerton Generation II, LLC, Wilmington Trust
         Company, United States Trust Company of New York, as Lease Indenture
         Trustee and United States Trust Company of New York, as Pass-Through
         Trustees; (iii) the Participation Agreement dated as of August 17, 2000
         by and among Midwest, Edison Mission Energy, Joliet Trust I, Joliet
         Generation I, LLC, Wilmington Trust Company, United States Trust
         Company of New York, as Lease Indenture Trustee and United States Trust
         Company of New York, as Pass-Through Trustees; (iv) the Participation
         Agreement dated as of August 17, 2000 by and among Midwest, Edison
         Mission Energy, Joliet Trust II, Joliet Generation II, LLC, Wilmington
         Trust Company, United States Trust Company of New York, as Lease
         Indenture Trustee and United States Trust Company of New York, as
         Pass-Through Trustees.

         "LEVERAGED LEASE TRANSACTION" shall mean the transaction pursuant to
         the Leveraged Lease Participation Agreement and the Leveraged Lease
         Operative Documents.".

     (b) SECTION 14.3 of the Participation Agreement shall be amended by
deleting SUBSECTION 14.3(F) of the Participation Agreement in its entirety and
replacing it with the following:

         "(f) Investments in or on behalf of Persons primarily engaged in the
         power generation, power sales or power transmissions business or in
         transactions related to such business.".

     (c) SECTION 14.5 of the Participation Agreement shall be amended by (i)
deleting the period at the end of SUBSECTION 14.5(B) of the Participation
Agreement and (ii) adding the following language at the end of SUBSECTION
14.5(B) of the Participation Agreement after the word "Investments":

         "or are used to purchase or repay Indebtedness ranking equal in right
         of payment to senior unsecured Indebtedness of EME.".

     (d) SECTION 14.6 of the Participation Agreement shall be amended by adding
the following sentence at the end of the section:

         "Notwithstanding the foregoing, the Leveraged Lease Transaction and the
         transactions contemplated by the Leveraged Lease Operative Documents
         shall be

                                       -2-

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         deemed not to be a contract or arrangement with an Affiliate for the
         purposes of this SECTION 14.6.".

     (e) SECTION 14.7 of the Participation Agreement shall be amended by (i)
adding the following after the word "excluding" in the second line of SECTION
14.7 of the Participation Agreement: "(i)"; and (ii) adding the following after
the word "Indebtedness" in line four of SECTION 14.7 of the Participation
Agreement: ", and (ii) any Leveraged Lease Operative Document and any agreement
with respect to any Indebtedness entered into by the Guarantor or any of its
Subsidiaries in connection with the Leveraged Lease Transaction".

         Section 3. CONDITIONS PRECEDENT. This Amendment shall become effective
and the Participation Agreement shall be amended on the date (the "AMENDMENT
EFFECTIVE DATE") on which the Collateral Agent shall have received from each of
the parties hereto a copy of this Amendment (whether the same or different
copies) duly executed and delivered by each other party hereto. Notwithstanding
the preceding sentence, this Amendment shall not become effective and the
Participation Agreement shall not be amended on the Amendment Effective Date (a)
if a Default or an Event of Default has occurred and is continuing on such date
and (b) unless, except as disclosed in EME's filings with the Securities and
Exchange Commission pursuant to the Exchange Act of 1934, the representations
and warranties of EME and Midwest contained in the Operative Documents are true
and correct in all material respects as of the Amendment Effective Date with the
same effect as though such representations and warranties had been made on and
as of the Amendment Effective Date (except for such representations and
warranties made as of a specified date, which shall be true and correct in all
material respects as of such specified date). The Collateral Agent shall notify
the parties hereto of the Amendment Effective Date promptly following the
effectiveness of this Amendment.

         Section 4. MISCELLANEOUS. Except as expressly amended hereby, all of
the terms and provisions of the Participation Agreement are and shall remain in
full force and effect. This Amendment may be executed in any number of
counterparts, all of which taken together shall constitute one and the same
instrument and any of the parties hereto may execute this Amendment by signing
any such counterpart. This Amendment shall be governed by, and construed in
accordance with, the law of the State of New York.

                                       -3-

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     IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
executed and delivered by their respective officers thereunto duly authorized.

                                       EDISON MISSION ENERGY, as Guarantor

                                       By:  /s/ John P. Finneran, Jr.
                                            ------------------------------------
                                       Name:  John P. Finneran, Jr.
                                       Title:  Vice President

                                       MIDWEST GENERATION, LLC, as Lessee

                                       By:  /s/ John P. Finneran, Jr.
                                            ------------------------------------
                                       Name:  John P. Finneran, Jr.
                                       Title:  Vice President

                                       EME/CDL TRUST, as Lessor
                                       By: Wilmington Trust Company, not in its
                                           individual capacity, but solely as
                                           Trustee

                                       By:   /s/ Robert P. Hines
                                            ------------------------------------
                                       Name:  Robert P. Hines
                                       Title:  Assistant Secretary and
                                               Financial Services Officer

                                       MIDWEST PEAKER HOLDINGS, INC., as Tranche

                                       A Noteholder

                                       By:  /s/ Gary Garcia
                                            ------------------------------------
                                       Name:  Gary Garcia
                                       Title:  Vice President

                                       BANK HAPOALIM, as Tranche B Noteholder

                                       By:  /s/ Laura Anne Raffa
                                            ------------------------------------
                                       Name:  Laura Anne Raffa
                                       Title:  First Vice President a
                                               and Corporate Manager

                                       By:  /s/ Shaun Breidbart
                                            ------------------------------------
                                       Name:  Shaun Breidbart
                                       Title:  Vice President

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                                       CITICORP DEL-LEASE, INC., as Investor

                                       By:  /s/ Julie M. Chin
                                            ------------------------------------
                                       Name:  Julie M. Chin
                                       Title:  Vice President

                                       WILMINGTON TRUST COMPANY, as Trust
                                       Company

                                       By:   /s/ Robert P. Hines
                                            ------------------------------------
                                       Name:  Robert P. Hines
                                       Title:  Assistant Secretary and
                                               Financial Services Officer

                                       WILMINGTON TRUST COMPANY, not in its
                                       individual capacity, except as expressly
                                       provided herein, but solely as Trustee

                                       By:   /s/ Robert P. Hines
                                            ------------------------------------
                                       Name:  Robert P. Hines
                                       Title:  Assistant Secretary and
                                               Financial Services Officer

                                       CITICORP NORTH AMERICA, INC., as Agent

                                       By:  /s/ Julie M. Chin
                                            ------------------------------------
                                       Name:  Julie M. Chin
                                       Title:  Vice President

                                       CITICORP NORTH AMERICA, INC.,
                                       as Collateral Agent

                                       By:  /s/ JULIE M. CHIN
                                            ------------------------------------
                                       Name:  Julie M. Chin
                                       Title:  Vice President<PAGE>

                                                                  Exhibit 10.90

                  REIMBURSEMENT AGREEMENT (this "AGREEMENT"), dated as of
August 17, 2000, entered into between Edison Mission Energy, a California
corporation ("EME") and Midwest Generation, LLC, a Delaware limited liability
company ("MIDWEST").

                  WHEREAS, Midwest is a wholly owned subsidiary of Edison
Mission Midwest Holdings Co. ("Holdings"), and is subject to the certain
covenants set forth in (A) the Credit Agreement, dated as of December 15,
1999 (as amended, modified or supplemented and in effect from time to time
and together with any refinancing or replacement thereof, the "HOLDINGS
CREDIT AGREEMENT"), among Holdings and certain commercial lending
institutions party thereto (the "LENDERS") and The Chase Manhattan Bank, as
the Administrative Agent; (B) the Participation Agreement, dated as of
December 15, 1999 (as heretofore amended, modified and supplemented, the
"PARTICIPATION AGREEMENT (T1)") among Collins Holdings EME, LLC ("COLLINS
HOLDINGS"), Wilmington Trust Company, as the Owner Trustee, Collins Trust I,
as the Owner Lessor, Collins Generation I, LLC, as Owner Participant,
Holdings, Midwest, Funding LLC, Bayerische Landesbank International S.A. (the
"MIDWEST LC ISSUER"), Bayerische Landesbank Girozentrale ("RCE LC ISSUER")
and the Holder Representative (as such term is defined therein); (C) the
Participation Agreement, dated as of December 15, 1999 (as heretofore
amended, modified and supplemented, the "PARTICIPATION AGREEMENT (T2)") among
Collins Holdings, Wilmington Trust Company, as the Owner Trustee, Collins
Trust II, as the Owner Lessor, Collins Generation II, LLC, as Owner
Participant, Holdings, Midwest, Funding LLC, the Midwest LC Issuer, the RCE
LC Issuer and the Holder Representative (as such term is defined therein);
(D) the Participation Agreement, dated as of December 15, 1999 (as heretofore
amended, modified and supplemented, the "PARTICIPATION AGREEMENT (T3)") among
Collins Holdings, Wilmington Trust Company, as the Owner Trustee, Collins
Trust III, as the Owner Lessor, Collins Generation III, LLC, as Owner
Participant, Holdings, Midwest, Funding LLC, the Midwest LC Issuer, the RCE
LC Issuer and the Holder Representative (as such term is defined therein);
(E) the Participation Agreement, dated as of December 15, 1999 (as heretofore
amended, modified and supplemented, the "PARTICIPATION AGREEMENT (T4)",
together with Participation Agreement (T1), Participation Agreement (T2) and
Participation Agreement (T3), "COLLINS PARTICIPATION AGREEMENTS") among
Collins Holdings, Wilmington Trust Company, as the Owner Trustee, Collins
Trust IV, as the Owner Lessor, Collins Generation IV, LLC, as Owner
Participant, Holdings,

                         REIMBURSEMENT AGREEMENT

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Midwest, Funding LLC, the Midwest LC Issuer, the RCE LC Issuer and the Holder
Representative (as such term is defined therein); and (F) the Credit
Agreement, dated as of May 9, 2000 (as amended, modified or supplemented and
in effect from time to time, the "CAPEX CREDIT AGREEMENT", together with the
Holdings Credit Agreement and Collins Participation Agreements (and related
Operative Documents defined therein), the "HOLDINGS CREDIT FACILITIES") among
Holdings, Societe Generale and Bayerische Landesbank Girozentrale ("CAPEX
LENDERS", and together with the Lenders and Lease Financing Parties under the
Collins Participation Agreements, the "CREDITOR PARTIES");

                  WHEREAS, contemporaneously herewith Midwest intends to
enter into a transaction pursuant to the Powerton/Joliet Lease Participation
Agreements (as defined below) whereby Midwest would sell certain of its
generating assets to Powerton Trust I, Powerton Trust II, Joliet Trust I and
Joliet Trust II (the "OWNER Lessors") and the Owner Lessors would lease such
generating assets to Midwest;

                  WHEREAS, Midwest will loan to EME of the proceeds of the
sale of the generating assets to the Owner Lessor (the "INTERCOMPANY LOAN");

                  WHEREAS, in connection with the transactions contemplated
by the Participation Agreements (as defined below), Holdings and Midwest
requested the Creditor Parties to approve such sale and lease-back of
generating assets;

                  NOW, THEREFORE, for and in consideration for the Creditor
Parties' approval of the transactions contemplated by the Participation
Agreements (as defined below) and the Intercompany Loan, and mutual covenants
herein contained, and for other good and valuable consideration, the receipt
and adequacy of which are hereby acknowledged, the parties hereto, intending
to be legally bound, do hereby covenant and agree as follows:

1.   DEFINITIONS. Unless otherwise expressly provided herein, capitalized terms
     used in this Agreement but not defined herein shall have meanings given to
     such terms in Appendix A to each of the Participation Agreements. The
     following terms, when used herein, shall have the following meanings:

                    "COMBINED RENT" means, collectively, Powerton Rent (T1),
                    Powerton Rent (T2), Joliet Rent (T1) and Joliet Rent (T2).

                            REIMBURSEMENT AGREEMENT
                                      2

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                    "JOLIET LEASE INTERCOMPANY NOTE (T1)" means the EME Note (as
                    defined in the Joliet Lease Participation Agreement (T1))
                    dated the Closing Date (as defined in the Joliet Lease
                    Participation Agreement (T1)) evidencing the loan by Midwest
                    to EME of the proceeds of the Joliet Lease Transaction (T1).

                    "JOLIET LEASE INTERCOMPANY NOTE (T2)" means the EME Note (as
                    defined in the Joliet Lease Participation Agreement (T2))
                    dated the Closing Date (as defined in the Joliet Lease
                    Participation Agreement (T2)) evidencing the loan by Midwest
                    to EME of the proceeds of the Joliet Lease Transaction (T2).

                    "JOLIET LEASE INTERCOMPANY NOTES" means, collectively, the
                    Joliet Lease Intercompany Note (T1) and the Joliet
                    Intercompany Note (T2).

                    "JOLIET LEASE OPERATIVE DOCUMENTS" means, collectively, the
                    Joliet Lease Operative Documents (T1) and the Joliet Lease
                    Operative Documents (T2).

                    "JOLIET LEASE OPERATIVE DOCUMENTS (T1)" means, collectively,
                    the Operative Documents as defined in the Joliet Lease
                    Participation Agreement (T1).

                    "JOLIET LEASE OPERATIVE DOCUMENTS (T2)" means, collectively,
                    the Operative Documents as defined in the Joliet Lease
                    Participation Agreement (T2).

                    "JOLIET LEASE PARTICIPATION AGREEMENT (T1)" means the
                    Participation Agreement (T1) dated as of August 17, 2000 by
                    and among Midwest, EME, Joliet Trust I, Wilmington Trust
                    Company, Joliet Generation I, the Lease Indenture Trustee
                    named therein and the Pass Through Trustees named therein.

                    "JOLIET LEASE PARTICIPATION AGREEMENT (T2)" means the
                    Participation Agreement (T2) dated as of August 17, 2000 by
                    and among Midwest, EME, Joliet Trust II, Wilmington Trust
                    Company, Joliet Generation II, the Lease Indenture Trustee
                    named therein and the Pass Through Trustees named therein.

                            REIMBURSEMENT AGREEMENT
                                      3

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                    "JOLIET LEASE PARTICIPATION AGREEMENTS" means, collectively,
                    the Joliet Lease Participation Agreement (T1) and the Joliet
                    Lease Participation Agreement (T2).

                    "JOLIET RENT (T1)" means Rent as defined in the Joliet Lease
                    Participation Agreement (T1).

                    "JOLIET RENT (T2)" means Rent as defined in the Joliet Lease
                    Participation Agreement (T2).

                    "JOLIET SUBORDINATION AGREEMENT (T1)" means the
                    Subordination Agreement dated as of August 17, 2000 between
                    Joliet Trust I, the Owner Participant (as defined in the
                    Joliet Participation Agreement (T1)), the Lease Indenture
                    Trustee (as defined in the Joliet Participation Agreement
                    (T1)) and the Holdings Collateral Agent.

                    "JOLIET SUBORDINATION AGREEMENT (T2)" means the
                    Subordination Agreement dated as of August 17, 2000 between
                    Joliet Trust II, the Owner Participant (as defined in the
                    Joliet Participation Agreement (T2)), the Lease Indenture
                    Trustee (as defined in the Joliet Participation Agreement
                    (T2)) and the Holdings Collateral Agent.

                    "JOLIET TRUST I" means Joliet Trust I, a Delaware business
                    trust.

                    "JOLIET TRUST II" means Joliet Trust II, a Delaware business
                    trust.

                    "LEASE FINANCING PARTIES" shall mean, as the context shall
                    require, all or any of the parties to Powerton/Joliet Lease
                    Operative Documents, including the Wilmington Trust Company
                    and excluding ComEd and the Holdings Collateral Agent.

                    "PARTICIPATION AGREEMENTS" means, collectively, the Powerton
                    Lease Participation Agreements and the Joliet Lease
                    Participation Agreements.

                    "POWERTON LEASE INTERCOMPANY NOTE (T1)" means the EME Note
                    (as defined in the Powerton Lease Participation Agreement
                    (T1)) dated the Closing Date (as defined in the Powerton
                    Lease Participation

                            REIMBURSEMENT AGREEMENT
                                      4

<PAGE>

                    Agreement (T1)) evidencing the loan by Midwest to EME of
                    the proceeds of the Powerton Lease Transaction (T1).

                    "POWERTON LEASE INTERCOMPANY NOTE (T2)" means the EME Note
                    (as defined in the Powerton Lease Participation Agreement
                    (T2)) dated the Closing Date (as defined in the Powerton
                    Lease Participation Agreement (T2)) evidencing the loan by
                    Midwest to EME of the proceeds of the Powerton Lease
                    Transaction (T2).

                    "POWERTON LEASE INTERCOMPANY NOTES" means, collectively, the
                    Powerton Lease Intercompany Note (T1) and the Powerton Lease
                    Intercompany Note (T2).

                    "POWERTON LEASE OPERATIVE DOCUMENTS" means, collectively,
                    the Powerton Lease Operative Documents (T1) and the Powerton
                    Lease Operative Documents (T2).

                    "POWERTON LEASE OPERATIVE DOCUMENTS (T1)" means,
                    collectively, the Operative Documents as defined in the
                    Powerton Lease Participation Agreement (T1).

                    "POWERTON LEASE OPERATIVE DOCUMENTS (T2)" means,
                    collectively, the Operative Documents as defined in the
                    Powerton Lease Participation Agreement (T2).

                    "POWERTON LEASE PARTICIPATION AGREEMENT (T1)" means the
                    Participation Agreement (T1) dated as of August 17, 2000 by
                    and among Midwest, EME, Powerton Trust I, Wilmington Trust
                    Company, Powerton Generation I, the Lease Indenture Trustee
                    named therein and the Pass Through Trustees named therein.

                    "POWERTON LEASE PARTICIPATION AGREEMENT (T2)" means the
                    Participation Agreement (T2) dated as of August 17, 2000 by
                    and among Midwest, EME, Powerton Trust II, Wilmington Trust
                    Company, Powerton Generation II, the Lease Indenture Trustee
                    named therein and the Pass Through Trustees named therein.

                            REIMBURSEMENT AGREEMENT
                                      5

<PAGE>

                    "POWERTON LEASE PARTICIPATION AGREEMENTS" means,
                    collectively, the Powerton Lease Participation Agreement
                    (T1) and the Powerton Lease Participation Agreement (T2).

                    "POWERTON RENT (T1)" means Rent as defined in the Powerton
                    Lease Participation Agreement (T1).

                    "POWERTON RENT (T2)" means Rent as defined in the Powerton
                    Lease Participation Agreement (T2).

                    "POWERTON SUBORDINATION AGREEMENT (T1)" means the
                    Subordination Agreement dated as of August 17, 2000 between
                    Powerton Trust I, the Owner Participant (as defined in the
                    Powerton Participation Agreement (T1)), the Lease Indenture
                    Trustee (as defined in the Powerton Participation Agreement
                    (T1)) and the Holdings Collateral Agent.

                    "POWERTON SUBORDINATION AGREEMENT (T2)" means the
                    Subordination Agreement dated as of August 17, 2000 between
                    Powerton Trust II, the Owner Participant (as defined in the
                    Powerton Participation Agreement (T2)), the Lease Indenture
                    Trustee (as defined in the Powerton Participation Agreement
                    (T2)) and the Holdings Collateral Agent.

                    "POWERTON TRUST I" means Powerton Trust I, a Delaware
                    business trust.

                    "POWERTON TRUST II" means Powerton Trust II, a Delaware
                    business trust.

                    "POWERTON/JOLIET LEASE INTERCOMPANY NOTES" means,
                    collectively, the Powerton Lease Intercompany Notes and the
                    Joliet Lease Intercompany Notes.

                    "POWERTON/JOLIET LEASE OPERATIVE DOCUMENTS" means,
                    collectively, the Powerton Lease Operative Documents and the
                    Joliet Lease Operative Documents.

                            REIMBURSEMENT AGREEMENT
                                      6

<PAGE>

                    "POWERTON/JOLIET LEASE PARTICIPATION AGREEMENTS" means,
                    collectively, the Powerton Lease Participation Agreement
                    (T1), Powerton Lease Participation Agreement (T2), Joliet
                    Lease Participation Agreement (T1) and Joliet Lease
                    Participation Agreement (T2).

                    "POWERTON/JOLIET SUBORDINATION AGREEMENTS" means,
                    collectively, the Powerton Subordination Agreement (T1), the
                    Powerton Subordination Agreement (T2), the Joliet
                    Subordination Agreement (T1) and the Joliet Subordination
                    Agreement (T2).

2.   OBLIGATION TO REIMBURSE MIDWEST. Within 5 Business Days after the last day
     of each Fiscal Quarter, EME shall pay to Midwest an amount equal to the
     excess of (i) Combined Rent and all amounts paid by Midwest under or in
     respect of the Powerton/Joliet Lease Operative Documents (including,
     without limitation, payments made by Midwest to the Lease Financing Parties
     in violation of the Powerton/Joliet Subordination Agreements or SECTION
     18.19 of each of the Participation Agreements) during such Fiscal Quarter
     OVER (ii) Free Cashflow for such Fiscal Quarter calculated as of such date
     (without deduction for Combined Leveraged Lease Liabilities paid by Midwest
     during such period); PROVIDED, that Base Free Cashflow for such Fiscal
     Quarter shall be zero in the event that any of the conditions to Restricted
     Payments set forth in the Holdings Credit Facilities (or the correlative
     conditions set forth in any credit facility that refinances or replaces any
     Holdings Credit Facility) have not been satisfied as of such date.

3.   OBLIGATION ABSOLUTE. EME's obligation under this Agreement shall be
     absolute and unconditional and shall not be subject to any defense or be
     affected by any right of setoff, counterclaim or recoupment which EME may
     now or hereafter have against Midwest or any other person for any reason
     whatsoever.

4.   NOTICES. All notices, requests and other communications provided for herein
     (including, without limitation, any modifications of, or waivers under,
     this Agreement) shall be given or made in writing (including, without
     limitation, by telecopy) delivered to the intended recipient at the
     "Address for Notices" specified below its name on the signature pages
     hereof, or, as to any party, at such other address as shall be designated
     by such party in a notice to each other party. Except as otherwise provided
     in this Agreement, all such commu-

                            REIMBURSEMENT AGREEMENT
                                      7

<PAGE>

     nications shall be deemed to have been duly given (a) when received by
     certified mail or by an international courier, such as Federal Express, by
     such Person, at said address of such Person or (b) when transmitted by
     facsimile to the number specified below and the receipt confirmed
     telephonically by recipient, PROVIDED that such facsimile is promptly
     followed by a copy of such notice delivered to such Person by postage-
     prepaid certified mail, or by an international courier, such as Federal
     Express.

5.   WAIVERS; ETC. The terms of this Agreement may be waived, altered or amended
     only by an instrument in writing duly executed by EME and Midwest. Any such
     amendment or waiver shall be binding upon EME and Midwest.

6.   SUCCESSORS AND ASSIGNS. This Agreement shall be binding upon and inure to
     the benefit of the respective successors and assigns of each of EME and
     Midwest.

7.   COUNTERPARTS; INTEGRATION; EFFECTIVENESS. This Agreement may be executed in
     any number of counterparts, all of which when taken together shall
     constitute one and the same instrument, and any of the parties hereto may
     execute this Agreement by signing any such counterpart. This Agreement
     constitutes the entire agreement and understanding among the parties hereto
     and supersedes any and all prior agreements and understandings, written or
     oral, relating to the subject matter hereof.

8.   SEVERABILITY. If any provision hereof is invalid or unenforceable in any
     jurisdiction, then, to the fullest extent permitted by applicable law, (a)
     the other provisions hereof shall remain in full force and effect in such
     jurisdiction and shall be liberally construed in order to carry out the
     intentions of the parties hereto as nearly as may be possible and (b) the
     invalidity or unenforceability of any provision hereof in any jurisdiction
     shall not affect the validity or enforceability of such provision in any
     other jurisdiction.

9.   HEADINGS. Headings appearing herein are used solely for convenience of
     reference and are not intended to affect the interpretation of any
     provision of this Agreement.

                            REIMBURSEMENT AGREEMENT
                                      8

<PAGE>

10.  WAIVER OF JURY TRIAL. EACH OF EME AND MIDWEST HEREBY IRREVOCABLY WAIVES, TO
     THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY AND ALL RIGHT TO TRIAL
     BY JURY IN ANY LEGAL PROCEEDING ARISING OUT OF OR RELATING TO THIS
     AGREEMENT OR THE TRANSACTIONS CONTEMPLATED HEREBY.

11.  NO THIRD PARTY BENEFICIARIES. THE AGREEMENTS OF THE PARTIES HERETO ARE
     SOLELY FOR THE BENEFIT OF MIDWEST (AND EACH PERSON WHO CLAIMS THROUGH
     MIDWEST), AND NO PERSON (OTHER THAN THE PARTIES HERETO AND THEIR SUCCESSORS
     AND ASSIGNS PERMITTED HEREUNDER) SHALL HAVE ANY RIGHTS HEREUNDER.

12.  GOVERNING LAW; SUBMISSION TO JURISDICTION. This Agreement shall be governed
     by, and construed in accordance with, the law of the State of New York. EME
     hereby submits to the non-exclusive jurisdiction of the United States
     District Court for the Southern District of New York and of the Supreme
     Court of the State of New York sitting in New York County (including its
     Appellate Division) and of any other appellate court in the State of New
     York for the purposes of all legal proceedings arising out of or relating
     to this Agreement or the transactions contemplated hereby. EME hereby
     irrevocably waives, to the fullest extent permitted by applicable law, any
     objection that it may now or hereafter have to the laying of the venue of
     any such proceeding brought in such a court and any claim that any such
     proceeding brought in such a court has been brought in an inconvenient
     forum.

                            REIMBURSEMENT AGREEMENT
                                      9

<PAGE>

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

                                      EDISON MISSION ENERGY

                                      By: /s/ John P. Finneran, Jr.
                                          ------------------------------
                                          Name: John P. Finneran, Jr.
                                          Title: Vice President

                                      Address for Notices:

                                      18101 Von Karman Avenue
                                      Suite 1700
                                      Irvine, CA 92616
                                      Attention: General Counsel
                                      Telecopier No.: (949) 752-1420

                            REIMBURSEMENT AGREEMENT

<PAGE>

                                        MIDWEST GENERATION, LLC

                                        By: /s/ Gary Garcia
                                            ---------------------------
                                            Name: Gary Garcia
                                            Title: Vice President

                                        Address for Notices:

                                        One Financial Place
                                        440 South LaSalle Street, Suite 3500
                                        Chicago, Illinois 60605
                                        Attn: President
                                        Telecopier No.: (312) 583-6111

                                        with a copy to:

                                        Edison Mission Midwest Holdings Co.
                                        18101 Von Karman Avenue
                                        Suite 1700
                                        Irvine, CA  92616
                                        Attention:  General Counsel
                                        Telecopier No.:  (949) 752-1420

                            REIMBURSEMENT AGREEMENT

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