Document:

<PAGE>

                                                                Exhibit 10.61.1

                                  AMENDMENT ONE

     AMENDMENT ONE (this "AMENDMENT") dated as of August 17, 2000 by and
among (i) EDISON MISSION ENERGY ("EME"), (ii) CERTAIN COMMERCIAL LENDING
INSTITUTIONS PARTY HERETO, (the "LENDERS") and (iii) CITICORP USA, INC., as
Administrative Agent for the Lenders (in such capacity, the "ADMINISTRATIVE
AGENT").

               WHEREAS, EME, the Lenders and the Administrative Agent have
entered into that certain Credit Agreement, dated as of March 18, 1999 (as
heretofore amended, modified and supplemented, the "CREDIT AGREEMENT"), which
sets forth, INTER ALIA, certain covenants of EME;

               WHEREAS, EME and its Subsidiary, Midwest Generation, LLC
("Midwest"), desire to enter into the Leveraged Lease Transaction (as defined
herein); and

               WHEREAS, EME has requested, and the Lenders and the
Administrative Agent have agreed, to amend certain provisions of the Credit
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 Credit Agreement are used herein (and in the
introductions and recitals hereto) as defined therein.

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

        (a) SECTION 1.1 of the Credit Agreement shall be amended by adding
the following definitions in alphabetical order:

                        AMENDMENT ONE TO CREDIT AGREEMENT

<PAGE>

               ""LEVERAGED LEASE BASIC DOCUMENTS" means the Basic Documents as
               defined in the Leveraged Lease Participation Agreement.

               "LEVERAGED LEASE PARTICIPATION AGREEMENT" means, collectively,
               (i) the Participation Agreement to be entered into among Midwest
               Generation, LLC, the Borrower, 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 Pass Through Trustee; (ii) the
               Participation Agreement to be entered into among Midwest
               Generation, LLC, the Borrower, 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 Trustee; (iii) the
               Participation Agreement to be entered into among Midwest
               Generation, LLC, the Borrower, 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 Trustee; and (iv) the
               Participation Agreement to be entered into among Midwest
               Generation, LLC, the Borrower, 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 Trustee.

               "LEVERAGED LEASE TRANSACTION" means the transaction consummated
               pursuant to the Leveraged Lease Participation Agreement and the
               Leveraged Lease Basic Documents.".

        (b) SECTION 7.2.5 of the Credit Agreement shall be amended by (i)
deleting the "and" at the end of SUBSECTION 7.2.5(d) of the Credit Agreement;
(ii) deleting the period at the end of SUBSECTION 7.2.5(e) of the Credit
Agreement and replacing it with the following: "; and"; and (iii) adding
SUBSECTION 7.2.5(f) to SECTION 7.2.5 of the Credit Agreement as follows:

               "(f) Investments in Persons primarily engaged in the power
               generation, power sales or power transmissions business.".

                        AMENDMENT ONE TO CREDIT AGREEMENT
                                      -2-

<PAGE>

        (c) SECTION 7.2.7 of the Credit Agreement shall be amended by (i)
deleting the period at the end of SUBSECTION 7.2.7(b) of the Credit Agreement
and (ii) adding the following language at the end of SUBSECTION 7.2.7(b) of
the Credit Agreement after the word "Investments":

               "or are used to purchase or repay Indebtedness ranking equal in
               right of payment to the Indebtedness of the Borrower hereunder.".

        (d) SECTION 7.2.8 of the Credit Agreement shall be amended by adding
the following sentence at the end of the section:

               "Notwithstanding the foregoing, the Leveraged Lease Transaction
               and the Leveraged Lease Basic Documents shall be deemed not to be
               contracts or arrangements with an Affiliate for the purposes of
               this SECTION 7.2.8.".

        (e) SECTION 7.2.9 of the Credit Agreement shall be amended by (i)
adding the following after the word "excluding" in the second line of SECTION
7.2.9 of the Credit Agreement: "(i)"; and (ii) adding the following after the
word "Indebtedness" in line four of SECTION 7.2.9 of the Credit Agreement:
"and, (ii) any Leveraged Lease Basic Document and any agreement with respect
to any Indebtedness entered into by the Borrower or any of its Subsidiaries
in connection with the Leveraged Lease Transaction".

               Section 3. CONDITIONS PRECEDENT. This Amendment shall become
effective and the Credit Agreement shall be amended on the date (the
"AMENDMENT EFFECTIVE DATE") on which (a) the Administrative Agent shall have
received from the Borrower and the Required Lenders a copy of this Amendment
(whether the same or different copies) duly executed and delivered by the
Borrower and the Required Lenders and (b) the Leveraged Lease Transaction
shall have been consummated pursuant to the Leveraged Lease Basic Documents
and the Leveraged Lease Participation Agreement in form and substance
substantially similar to the versions in effect on the date hereof, with any
material changes as the Administrative Agent shall have approved.
Notwithstanding the preceding sentence, this Amendment shall not become
effective and the Credit 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 the Borrower's
filings with the Securities and Exchange Commission pursuant to the Exchange
Act of 1934, as

                        AMENDMENT ONE TO CREDIT AGREEMENT
                                      -3-

<PAGE>

amended, the representations and warranties of the Borrower contained in the
Loan 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 Administrative Agent shall notify the Lenders of the Amendment
Effective Date promptly following the effectiveness of this Amendment.

               Section 5. EXPENSES. The Borrower agrees to pay and reimburse
the Administrative Agent for all its reasonable out-of-pocket costs and
expenses incurred in connection with the negotiation, execution and delivery
of this Amendment, including the reasonable fees and expenses of counsel.

               Section 6. MISCELLANEOUS. Except as expressly amended hereby,
all of the terms and provisions of the Credit Agreement are and shall remain
in full force and effect. This Amendment may be executed in any number of
counterparts and by facsimile signature, all of which taken together shall
constitute one and the same original 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.

                        AMENDMENT ONE TO CREDIT AGREEMENT
                                      -4-

<PAGE>

        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

                                  By:  /s/ Gary Garcia
                                     -------------------------------
                                       Name:  Gary Garcia
                                       Title: Treasurer

                                  CITICORP USA, INC.,
                                  as Administrative Agent and Initial Lender

                                  By:  /s/ Sandip Sen
                                     -------------------------------
                                       Name:  Sandip Sen
                                       Title: Managing Director
                                              (Attorney-In-Fact)

                                  CREDIT SUISSE FIRST BOSTON,
                                  as Initial Lender

                                  By:  /s/ James P. Moran
                                     -------------------------------
                                       Name:  James P. Moran
                                       Title: Director

                                  By:  /s/ Bill O' Daly
                                     -------------------------------
                                       Name:  Bill O' Daly
                                       Title: Vice President

                        AMENDMENT ONE TO CREDIT AGREEMENT

<PAGE>

                                  LEHMAN COMMERCIAL PAPER
                                  INC.,
                                  as Initial Lender

                                  By:  /s/ Michele Swanson
                                     -------------------------------
                                       Name:  Michele Swanson
                                       Title: Authorized Signatory

                                  SOCIETE GENERALE,
                                  as Initial Lender

                                  By:  /s/ David Bird
                                     -------------------------------
                                       Name:  David Bird
                                       Title: Vice President

                                  ABN AMRO BANK N.V.,
                                  as Lender

                                  By:  /s/ David B. Bryant
                                     -------------------------------
                                       Name:  David B. Bryant
                                       Title: Senior Vice President/
                                       Managing Director

                                  By:  /s/ Gregory Babaya
                                     -------------------------------
                                       Name: Gregory Babaya
                                       Title: Assistant Vice President

                                  AUSTRALIA & NEW ZEALAND
                                  BANK,
                                  as Lender

                                  By:  /s/ Richard M. Chinloy
                                     -------------------------------
                                       Name:  Richard M. Chinloy
                                       Title: Director

                        AMENDMENT ONE TO CREDIT AGREEMENT

<PAGE>

                                  BANCO DI NAPOLI,
                                  as Assignee

                                  By:
                                       Name:
                                       Title:

                                  UNION BANK OF CALIFORNIA,
                                  as Lender

                                  By:  /s/ Dennis G. Blank
                                     -------------------------------
                                       Name:  Dennis G. Blank
                                       Title: Vice President

                                  BANK OF MONTREAL,
                                  as Lender

                                  By:  /s/ Cahal B. Carmody
                                     -------------------------------
                                       Name:  Cahal B. Carmody
                                       Title: Director

                                  BANK OF NOVA SCOTIA,
                                  as Lender

                                  By:  /s/ John Gluck
                                     -------------------------------
                                       Name: John Gluck
                                       Title: Managing Director

                        AMENDMENT ONE TO CREDIT AGREEMENT

<PAGE>

                                  BARCLAYS BANK PLC,
                                  as Lender

                                  By:
                                       Name:
                                       Title:

                                  BAYERISCHE HYPO-UND
                                  VEREINSBANK AG,
                                  as Lender

                                  By:
                                       Name:
                                       Title:

                                  BAYERISCHE LANDESBANK
                                  GIROZENTRALE,
                                  as Lender

                                  By:  /s/ Thomas von Kistowsky
                                     -------------------------------
                                       Name:  Thomas von Kistowsky
                                       Title: Senior Vice President /
                                       Branch Director

                                  By:  /s/ Cornelia Wintergerst
                                     -------------------------------
                                       Name:  Cornelia Wintergerst
                                       Title: Vice President

                        AMENDMENT ONE TO CREDIT AGREEMENT

<PAGE>

                                  CREDIT LYONNAIS,
                                  as Lender

                                  BNP PARIBAS,
                                  as Lender

                                  By:
                                       Name:
                                       Title:

                                  COMMERZBANK AG,
                                  as Lender

                                  By:
                                       Name:
                                       Title:

                                  CREDIT INDUSTRIEL ET
                                  COMMERCIAL
                                  as Lender

                                  By:  /s/ Marc Baraduc
                                     -------------------------------
                                       Name:  Marc Baraduc
                                       Title:  Assistant Vice President

                                  By:  /s/ Mark D. Palin
                                     -------------------------------
                                       Name:  Mark D. Palin
                                       Title: Vice President

                                  CREDIT LOCAL DE FRANCE,
                                  as Lender

                                  By:
                                       Name:
                                       Title:

                        AMENDMENT ONE TO CREDIT AGREEMENT

<PAGE>

                                  CREDIT LYONNAIS,
                                  as Lender

                                  By:
                                       Name:
                                       Title:

                                  DRESDNER BANK,
                                  as Lender

                                  By: /s/ Michael E. Higgins
                                  ----------------------------
                                  Name:  Michael E. Higgins
                                  Title: Vice President

                                  By: /s/ Andrew Cullinan
                                  ----------------------------
                                  Name:  Andrew Cullinan
                                  Title: Assistant Treasurer

                                  INDUSTRIAL BANK OF JAPAN,
                                  as Lender

                                  By:
                                       Name:
                                       Title:

                                  ING US CAPITAL CORP,
                                  as Lender

                                  By:
                                       Name:
                                       Title:

                        AMENDMENT ONE TO CREDIT AGREEMENT

<PAGE>

                                  NORDEUTSCHE LANDESBANK
                                  GIROZENTRALE,
                                  as Lender

                                  By:  /s/ Bruno J-M Mejean
                                     -------------------------------
                                       Name:  Bruno J-M Mejean
                                       Title: Senior Vice President

                                  By:  /s/ Stefanie Scholz
                                     -------------------------------
                                       Name:  Stefanie Scholz
                                       Title: A.T.

                                  CITIBANK, N.A.,
                                  as Lender

                                  By:
                                       Name:
                                       Title:

                                  ROYAL BANK OF SCOTLAND,
                                  as Lender

                                  By:  /s/ Derek Weir
                                     -------------------------------
                                       Name:  Derek Weir
                                       Title: Senior Vice President

                        AMENDMENT ONE TO CREDIT AGREEMENT

<PAGE>

                                  WESTDEUTSCHE LANDESBANK
                                  GIROZENTRALE,
                                  as Lender

                                  By:  /s/ Michael P. Sassos
                                     -------------------------------
                                       Name:  Michael P. Sassos
                                       Title: Associate Director

                                  By:  /s/ Cyril Derueloy
                                     -------------------------------
                                       Name:  Cyril Derueloy
                                       Title:  Manager

                        AMENDMENT ONE TO CREDIT AGREEMENT<PAGE>

                                                                 Exhibit 10.65.1

                                  AMENDMENT ONE

     AMENDMENT ONE (this "AMENDMENT"), dated as of August 17, 2000, by and among
EDISON MISSION ENERGY, (the "GUARANTOR"), EME FINANCE UK LIMITED (the
"BORROWER"), the BANKS (as defined below) consenting hereto and BARCLAYS BANK
PLC, as Facility Agent (the "FACILITY AGENT") for the Banks.

          WHEREAS, the Borrower, certain banks party thereto (the "BANKS"),
Barclays Capital and Credit Suisse First Boston, as arrangers, and the Facility
Agent have entered into that certain Coal and CAPEX Facility Agreement dated
July 16, 1999 (the "FACILITY AGREEMENT");

          WHEREAS, pursuant to the Facility Agreement the Guarantor issued that
certain Guarantee, dated as of July 16, 1999 (the "GUARANTEE"), in favor of the
Facility Agent, as Facility Agent for the Banks, which sets forth, INTER ALIA,
certain covenants of the Guarantor;

          WHEREAS, pursuant to Clause 22 of the Facility Agreement, the consent
of the Majority Banks and the Facility Agent is required for any amendment to
the Guarantee;

          WHEREAS, the Guarantor and its Subsidiary, Midwest Generation, LLC
("MIDWEST"), desire to enter into the Leveraged Lease Transaction (as defined
herein); and

          WHEREAS, the Guarantor has requested, and the Facility Agent and the
Banks party hereto have agreed, to amend certain provisions of the Guarantee 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 Guarantee are used herein (and in the introductions and
recitals hereto) as defined therein.

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

                           AMENDMENT ONE TO GUARANTEE

                                       1
<PAGE>

     (a) SECTION 1.1. of the Guarantee shall be amended by adding the following
definitions:

          ""LEVERAGED LEASE BASIC DOCUMENTS" means the Operative Documents as
          defined in the Leveraged Lease Participation Agreement.

          "LEVERAGED LEASE PARTICIPATION AGREEMENT" means, collectively, (i) the
          Participation Agreement dated as of August 17, 2000 by and among
          Midwest Generation, LLC, the Guarantor, 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 Pass Through Trustees; (ii) the
          Participation Agreement dated as of August 17, 2000 by and among
          Midwest Generation, LLC, the Guarantor, 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 Generation, LLC, the Guarantor, 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; and (iv) the
          Participation Agreement dated as of August 17, 2000 by and among
          Midwest Generation, LLC, the Guarantor, 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" means the transactions consummated
          pursuant to the Leveraged Lease Participation Agreement and the
          Leveraged Lease Basic Documents.".

     (b) SECTION 4.2.4. of the Guarantee shall be amended by (i) deleting the
"and" at the end of SUBSECTION 4.2.4.(IV) of the Guarantee; (ii) deleting the
period at the end of SUBSECTION 4.2.4.(V) of the Guarantee and replacing it with
the following: "; and"; and (iii) adding SUBSECTION 4.2.4.(VI) to SECTION 4.2.4.
of the Guarantee as follows:

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

                           AMENDMENT ONE TO GUARANTEE

                                       2
<PAGE>

     (c) SECTION 4.2.6. of the Guarantee shall be amended by (i) deleting the
period at the end of SUBSECTION 4.2.6.(II) of the Guarantee and (ii) adding the
following language at the end of SUBSECTION 4.2.6.(II) of the Guarantee after
the word "Investments":

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

     (d) SECTION 4.2.7. of the Guarantee 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 Basic Documents
          shall be deemed not to be a contract or arrangement with an Affiliate
          for the purposes of this SECTION 4.2.7.".

     (e) SECTION 4.2.8. of the Guarantee shall be amended by (i) adding the
following after the word "Document" in the second line of SECTION 4.2.8. of the
Guarantee: ", any Leveraged Lease Basic Document, 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 Guarantee shall be amended on the date (the "AMENDMENT EFFECTIVE DATE")
on which the Facility Agent shall have executed the Amendment and shall have
received from the Guarantor, the Borrower and the Majority Banks a copy of this
Amendment (whether the same or different copies) duly executed and delivered by
the Guarantor, the Borrower and the Banks. Notwithstanding the preceding
sentence, this Amendment shall not become effective and the Guarantee shall not
be amended on the Amendment Effective Date (a) if a Potential Event of Default
or an Event of Default has occurred and is continuing on such date and (b)
unless, except as disclosed in the Guarantor's filings with the Securities and
Exchange Commission pursuant to the Exchange Act of 1934, the representations
and warranties of the Guarantor contained in the Loan 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 Facility Agent shall notify
the Banks of the Amendment Effective Date promptly following the effectiveness
of this Amendment.

                           AMENDMENT ONE TO GUARANTEE

                                       3
<PAGE>

          Section 4. MISCELLANEOUS. Except as expressly amended hereby, all of
the terms and provisions of the Guarantee are and shall remain in full force and
effect. This Amendment may be executed in any number of counterparts and by
facsimile signature, all of which taken together shall constitute one and the
same original 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 laws of England.

            [THE REST OF THIS PAGE HAS INTENTIONALLY BEEN LEFT BLANK]

                           AMENDMENT ONE TO GUARANTEE

                                       4
<PAGE>

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

                                       By:  /s/ Cynthia S. Dubin
                                           -----------------------------
                                       Name:    Cynthia S. Dubin
                                       Title: Vice President
                                       Date:    August 24, 2000

                                       EME FINANCE UK LIMITED

                                       By: /s/ James Courtis - Pond
                                       Name:    James Courtis - Pond
                                       Title: Director
                                       Date:    August 24, 2000

                                       BARCLAYS BANK PLC, as Facility Agent
                                       for the Banks party to the Coal and CAPEX
                                       Facility Agreement

                                       By:  /s/ Duncan Nash
                                           -----------------------------
                                       Name:    Duncan Nash
                                       Title: Manager
                                       Date:   August 22, 2000

                                       BARCLAYS BANK PLC, on behalf of, and
                                       with the consent of, the Majority Banks

                                       By:  /s/  Duncan Nash
                                           -----------------------------
                                       Name:    Duncan Nash
                                       Title:   Manager
                                       Date:   August 22, 2000

                           AMENDMENT ONE TO GUARANTEE

                                       5

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