Document:

<PAGE>

                                EXHIBIT 10.56.1

     AMENDMENT NO. 1, dated as of May 27, 1999 (this "Amendment"), to the
Guarantee and Collateral Agreement, dated as of March 18, 1999 (the
"AGREEMENT"), among (i) EDISON MISSION HOLDINGS CO ., a California corporation
(the "BORROWER"), (ii) EDISON MISSION FINANCE CO., a California corporation
("Edison Mission Finance"), (iii) HOMER CITY PROPERTY HOLDINGS, INC., a
California corporation ("HOMER CITY HOLDINGS"), (iv) CHESTNUT RIDGE ENERGY
COMPANY, a California corporation ("CHESTNUT RIDGE"), (v) MISSION ENERGY
WESTSIDE, INC., a California corporation ("MEW"), (vi)EME HOMER CITY GENERATION
L.P., a Pennsylvania limited partnership ("EME HOMER CITY"), (vii) EDISON
MISSION ENERGY, a California corporation ("EDISON MISSION ENERGY"); and,
together with the Borrower, Edison Mission Finance, Homer City Holdings,
Chestnut Ridge, MEW and EME Homer City, the "GRANTORS"), and (viii) UNITED
STATES TRUST COMPANY OF NEW YORK, as collateral agent for the Secured Parties
(in such capacity, the "COLLATERAL AGENT").

                                    RECITALS

          A. The Borrower has entered into a Credit Agreement, dated as of March
18, 1999 (as the same may be amended, supplemented or otherwise modified from
time to time, the "CREDIT AGREEMENT"; the loans made thereunder, the "LOANS"),
with certain financial institutions (collectively, the "LENDERS") and Citicorp
USA, Inc., as administrative agent for the Lenders (in such capacity, the
"ADMINISTRATIVE AGENT").

          B. Pursuant to the Agreement, each Grantor pledged and assigned to the
Collateral Agent for the benefit of the Secured Parties security interests in
certain personal property of such Grantor described in the Agreement.

          C. The Borrower wished to issue $300 million in aggregate principal
amount of Senior Secured Bonds due 2019 and $530 million in aggregate principal
amount of Senior Secured Bonds due 2026 (collectively, the "BONDS"; the trustee
to the holders thereof, the "TRUSTEE"), the proceeds of which will be used to
refinance a portion of the Loans and to repay a portion of the Borrower's direct
parent's equity investment in the Borrower.

          D. The Grantors have requested, and, upon this Amendment becoming
effective, the Collateral Agent has agreed, that certain provisions of the
Agreement be amended in the manner provided for in this Amendment.

<PAGE>
         NOW, THEREFORE, the parties hereto hereby agree as follows:

         1. DEFINITION OF SECURED PARTIES. The definition of "Secured Parties"
in Section 1.1(b) of the Agreement is hereby amended by adding the phrase "the
Trustee," after the phrase "the Lenders," in the first line of such
definition.

         2. GRANT AND CONFIRMATION OF GRANT OF SECURITY INTEREST. Each of the
Grantors hereby grants and confirms the grant of the security interest in the
Collateral in favor of the Collateral Agent for the benefit of the Secured
Parties (as defined in this Amendment) to secure such Grantor's Obligations.
Edison Mission Energy hereby grants and confirms the grant of the security
interest in all shares of capital stock of the Borrower in favor of the
Collateral Agent for the benefit of the Secured Parties (as defined in this
Amendment) to secure the Borrower Obligations.

         3. COUNTERPARTS. This Amendment may be executed by the parties
hereto in any number of separate counterparts, and all of said counterparts
taken together shall be deemed to constitute one and the same instrument.
Delivery of an executed counterpart of a signature page to this letter by
facsimile shall be effective as delivery of a manually executed counterpart
of this Amendment.

         4. LIMITED EFFECT. Except as expressly provided herein, all of the
terms and provisions of the Agreement are and shall remain in full force and
effect.

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

         6. CONDITIONS TO EFFECTIVENESS. The amendment provided for herein
shall become effective on the date the Collateral Agent shall have received
counterparts of this Amendment duly executed and delivered by each Grantor
and consented to by the Administrative Agent and the Trustee.

         7. APPLICABLE LAW. THIS AMENDMENT AND THE RIGHTS AND OBLIGATIONS OF
THE PARTIES HERETO SHALL BE GOVERNED BY, AND CONSTRUED AND INTERPRETED IN
ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.

                                      2

<PAGE>

                                          MISSION ENERGY WESTSIDE, INC.

                                          By:  /s/ Steven D. Eisenberg
                                             ----------------------------
                                             Name: Steven D. Eisenberg
                                             Title: Vice President

                                          EME HOMER CITY GENERATION L.P.
                                          By: Mission Energy Westside,  Inc.
                                              its General Partner

                                          By:  /s/ Steven D. Eisenberg
                                             ----------------------------
                                             Name: Steven D. Eisenberg
                                             Title: Vice President

                                          EDISON MISSION ENERGY

                                          By:  /s/ Steven D. Eisenberg
                                             ----------------------------
                                             Name: Steven D. Eisenberg
                                             Title: Vice President

                                          UNITED STATES TRUST COMPANY OF
                                          NEW YORK, as Collateral Agent

                                          By:  /s/ Christopher J. Grell
                                             ----------------------------
                                             Name: Christopher J. Grell
                                             Title: Assistant Vice President

    Signature Page to Amendment No. 1 to Guarantee and Collateral Agreement

<PAGE>

     IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
duly executed and delivered by their respective proper and duly authorized
officers as of the day and year first above written.

                                          EDISON MISSION HOLDINGS CO.

                                          By:  /s/ Steven D. Eisenberg
                                             ----------------------------
                                             Name: Steven D. Eisenberg
                                             Title: Vice President

                                          EDISON MISSION FINANCE CO.

                                          By:  /s/ Steven D. Eisenberg
                                             ----------------------------
                                             Name: Steven D. Eisenberg
                                             Title: Vice President

                                          HOMER CITY PROPERTY HOLDINGS,
                                          INC.

                                          By:  /s/ Steven D. Eisenberg
                                             ----------------------------
                                             Name: Steven D. Eisenberg
                                             Title: Vice President

                                          CHESTNUT RIDGE ENERGY COMPANY

                                          By:  /s/ Steven D. Eisenberg
                                             ----------------------------
                                             Name: Steven D. Eisenberg
                                             Title: Vice President

    Signature Page to Amendment No. 1 to Guarantee and Collateral Agreement

<PAGE>

Acknowledged and Consented to by:

CITICORP USA, INC., as Administrative Agent

By:  /s/ Anita J. Brickell
   ---------------------------------
   Name: Anita J. Brickell
   Title: Managing Director

UNITED STATES TRUST COMPANY OF NEW YORK, as Trustee

By:  /s/ Christopher J. Grell
   ---------------------------------
   Name: Christopher J. Grell
   Title: Assistant Vice President

    Signature Page to Amendment No. 1 to Guarantee and Collateral Agreement<PAGE>

                                                                 Exhibit 10.56.2

                   THIS MORTGAGE CONSTITUTES A FIXTURE FILING
                 UNDER THE PENNSYLVANIA UNIFORM COMMERCIAL CODE

            THIS MORTGAGE SECURES FUTURE ADVANCES AND RE-ADVANCES UP
               TO A MAXIMUM PRINCIPAL AMOUNT OF $1,100,000,000.00
                  AT ANY TIME OUTSTANDING PLUS ACCRUED INTEREST
           AND OTHER INDEBTEDNESS AS DESCRIBED IN 42 PA.C.S.A. ss.8143

                      OPEN-END MORTGAGE, SECURITY AGREEMENT
                       AND ASSIGNMENT OF LEASES AND RENTS

                     (THIS MORTGAGE SECURES FUTURE ADVANCES)

                                      from

                         EME HOMER CITY GENERATION L.P.

                                       to

                    UNITED STATES TRUST COMPANY OF NEW YORK,
                        as Collateral Agent and Mortgagee

                           DATED AS OF MARCH 18, 1999

                       After recording, please return to:
                           Simpson Thacher & Bartlett
                              425 Lexington Avenue
                            New York, New York 10017

                           ATTN: Daniel E. Karp, Esq.

<PAGE>
                                                                               2

$250,000,000. The maximum aggregate principal amount of the Loans outstanding at
any one time shall not exceed $1,100,000,000.00.

      D. The Borrower will use the proceeds of the Loans under the Credit
Agreement to make valuable transfers to one or more of its Subsidiaries
(including the Mortgagor) in connection with the acquisition of the Homer City
Electric Generating Station and certain facilities and other assets associated
therewith and ancillary thereto (the "Generating Station"), certain capital
expenditures related to the Generating Station and general working capital
purposes.

      E. Under Section 8.2.1(e) of the Credit Agreement, the Borrower is
permitted to incur certain indebtedness for the purpose of refinancing the Loans
and other indebtedness of the Borrower ("Refinancing Indebtedness"); under
Section 8.2.1(d)(i) of the Credit Agreement, the Loan Parties are permitted to
incur certain indebtedness in the form of reimbursement obligations relating to
letters of credit, surety bonds and performance bonds used by the Loan Parties
in the ordinary course of their business ("Ordinary Course Letter of Credit
Indebtedness"); under Section 8.2.1 (d)(ii) of the Credit Agreement, the
Borrower is permitted to incur certain indebtedness in the form of reimbursement
obligations relating to Debt Service Reserve Letters of Credit (as defined
below) ("DSR Letter of Credit Indebtedness"); under Section 8.2.1(c) of the
Credit Agreement, the Borrower is permitted to incur certain additional
indebtedness ("Additional Indebtedness"); and, under Section 8.2.1(b) of the
Credit Agreement, the Borrower is permitted to incur certain indebtedness under
Interest Rate Hedging Transactions (as defined below) entered into with respect
to the Loans ("Swap Indebtedness") (the Refinancing Indebtedness, the Ordinary
Course Letter of Credit Indebtedness, the DSR Letter of Credit Indebtedness, the
Additional Indebtedness and the Swap Indebtedness, together with the Loans,
being collectively referred to as the "Senior Debt").

      F. In satisfaction of the requirements of the Lenders and the Persons
providing any Refinancing Indebtedness or Additional Indebtedness, the Mortgagor
desires by this Mortgage and the Guarantee and Collateral Agreement to provide a
common pool of collateral as security for their obligations under the Financing
Documents (as defined below).

      G. In order to simplify administration of such collateral and to provide
for the orderly enforcement of their respective rights, the Administrative
Agent, the Lenders and the other Secured Parties (as defined in the Guarantee
and Collateral Agreement) have appointed the Collateral Agent to serve as their
common representative, to be the beneficiary under any guarantee intended to
benefit the Secured Parties, and to hold the liens created, or to be created,
under the Financing Documents.

      H. Pursuant to the Collateral Agency and Intercreditor Agreement, dated as
of March 18, 1999 (as amended, supplemented or otherwise modified from time to
time, the "Collateral Agency and Intercreditor Agreement"), among the Borrower,
the Administrative Agent, the Collateral Agent and certain other parties, the
Collateral Agent has agreed to serve as a common collateral agent for all
Secured Parties.

<PAGE>
                                                                               4

THE MORTGAGOR HAS GRANTED, CONVEYED, BARGAINED, SOLD, ALIENED, ENFEOFFED,
RELEASED, CONFIRMED, MORTGAGED AND WARRANTED TO THE MORTGAGEE A LIEN UPON AND A
SECURITY INTEREST IN, AND HEREBY GRANTS, CONVEYS, BARGAINS, SELLS, ALIENS,
ENFEOFFS, RELEASES, CONFIRMS, MORTGAGES AND WARRANTS UNTO THE MORTGAGEE:

      (A) the Real Estate;

      (B) all the estate, right, title, claim or demand whatsoever of the
Mortgagor, in possession or expectancy, in and to the Real Estate or any part
thereof;

      (C) all right, title and interest of the Mortgagor in, to and under all
easements, rights of way, gores of land, streets, ways, alleys, passages, sewer
rights, waters, water courses, water and riparian rights, development rights,
air rights, mineral rights, oil and gas rights and all estates, rights, titles,
interests, privileges, licenses, tenements, hereditaments and appurtenances
belonging, relating or appertaining to the Real Estate, and any reversions,
remainders, rents, issues, profits and revenue thereof and all land lying in the
bed of any street, road or avenue, in front of or adjoining the Real Estate to
the center line thereof;

      (D) all of the fixtures, chattels, business machines, machinery,
apparatus, equipment, furnishings, fittings and articles of personal property of
any kind and nature whatsoever, and all appurtenances and additions thereto and
substitutions or replacements thereof (together with, in each case, attachments,
components, parts and accessories) currently owned or subsequently acquired by
the Mortgagor and now or subsequently attached to, or contained in or used or
usable in any way in connection with any operation or letting of the Real
Estate, including but without limiting the generality of the foregoing, all
screens, awnings, shades, blinds, curtains, draperies, artwork, carpets, rugs,
storm doors and windows, furniture and furnishings, heating, electrical, and
mechanical equipment, lighting, switchboards, plumbing, ventilating, air
conditioning and air-cooling apparatus, refrigerating, and incinerating
equipment, escalators, elevators, loading and unloading equipment and systems,
stoves, ranges, laundry equipment, cleaning systems (including window cleaning
apparatus), telephones, communication systems (including satellite dishes and
antennae), televisions, computers, sprinkler systems and other fire prevention
and extinguishing apparatus and materials, security systems, motors, engines,
machinery, pipes, pumps, tanks, conduits, appliances, fittings and fixtures of
every kind and description (all of the foregoing in this paragraph (D) being
referred to as the "Equipment");

      (E) all right, title and interest of the Mortgagor in and to all
substitutes and replacements of, and all additions and improvements to, the Real
Estate and the Equipment, subsequently acquired by or released to the Mortgagor
or constructed, assembled or placed by the Mortgagor on the Real Estate,
immediately upon such acquisition, release, construction, assembling or
placement, including, without limitation, any and all building materials whether
stored at the Real Estate or offsite, and, in each such case, without any
further mortgage, conveyance, assignment or other act by the Mortgagor;

<PAGE>
                                                                               6

insurance policies covering the foregoing property or otherwise on deposit with
or held by the Mortgagee as provided in this Mortgage; and

      (K) all proceeds, both cash and noncash, of the foregoing, subject to the
applicable provisions set forth below and in the Credit Agreement;

      (All of the foregoing property and rights and interests now owned or held
or subsequently acquired by the Mortgagor and described in the foregoing clauses
(A) through (E) are collectively referred to as the "Premises", and those
described in the foregoing clauses (A) through (K) are collectively referred to
as the ("Mortgaged Property").

      TO HAVE AND TO HOLD the Mortgaged Property and the rights and privileges
hereby mortgaged unto the Mortgagee, its successors and assigns for the uses and
purposes set forth, until the Obligations are paid in full and any other
requirements contained in the Financing Documents are performed in full.
PROVIDED ALWAYS, that if the Mortgagor shall promptly and fully pay all of the
Obligations and shall pay and perform all of the other requirements contained in
the Financing Documents, then the estate hereby granted shall cease, terminate
and become void and Mortgagee shall, upon written request from Mortgagor,
execute and deliver to Mortgagor any satisfaction, release or termination
instrument required in connection therewith but shall otherwise remain in full
force and effect.

      This Mortgage covers present and future advances and re-advances in
accordance with the terms of the Credit Agreement, in the aggregate amount of
the obligations secured hereby, made by the Lenders for the benefit of, inter
alia, the Mortgagor and the Borrower and the lien of such future advances and
re-advances shall relate back to the date of this Mortgage.

                              Terms and Conditions

      The Mortgagor further represents, warrants, covenants and agrees with the
Mortgagee as follows:

      1. Warranty of Title. The Mortgagor warrants the title to the Premises,
subject only to the matters that are set forth in Schedule B of the title
insurance policy or policies being issued to the Mortgagee to insure the lien of
this Mortgage (the "Permitted Exceptions").

      2. Performance Obligations. The Mortgagor shall perform all of the
Obligations in accordance with the terms of this Mortgage and the Financing
Documents.

      3. Requirements.

      (a) The Mortgagor shall promptly comply with, or cause to be complied
with, and conform in all material respects to all present and future laws,
statutes, codes, ordinances, orders, judgments, decrees, rules, regulations and
requirements, and irrespective of the nature of the work to be done, of each of
the United States of America, any State and any municipality, local government
or other political subdivision thereof and any agency, department, bureau,
board, commission or other instrumentality of any of them, now existing or
subsequently created

<PAGE>
                                                                               8

of any Impositions shall be payable on demand by the Mortgagor to the Mortgagee
together with interest at the Default Rate as set forth above from the date of
payment by Mortgagee.

      (c) The Mortgagor shall have the right before any delinquency occurs to
contest or object in good faith to the amount or validity of any imposition by
appropriate legal proceedings, but such right shall not be deemed or construed
in any way as relieving, modifying, or extending the Mortgagor's covenant to pay
any such Imposition at the time and in the manner provided in this Section
unless (i) the Mortgagor has given prior written notice to the Mortgagee of the
Mortgagor's intent so to contest or object to an Imposition, (ii) the Mortgagor
shall demonstrate to the Mortgagee's reasonable satisfaction that the legal
proceedings shall operate conclusively to prevent the sale of the Mortgaged
Property, or any part thereof, to satisfy such Imposition prior to final
determination of such proceedings and (iii) the Mortgagor shall furnish a good
and sufficient bond or surety as requested by and reasonably satisfactory to the
Mortgagee in the amount of the Impositions which are being contested plus any
interest and penalty which may be imposed thereon and which could become a lien
against the Real Estate or any part of the Mortgaged Property.

      5. Insurance. (a) The Mortgagor shall maintain or cause to be maintained
on all of the Premises the insurance required to be maintained by Mortgagor
pursuant to Section 8.1.5 of the Credit Agreement.

      (b) If the Mortgaged Property, or any part thereof, shall be destroyed or
damaged, the Mortgagor shall give immediate notice thereof to the Mortgagee. All
insurance proceeds shall be paid to the Mortgagee to be held by the Mortgagee as
collateral to secure the payment and performance of the Obligations.
Notwithstanding the preceding sentence, provided that no Event of Default shall
have occurred and be continuing, the Mortgagor shall have the right to adjust
such loss, and the insurance proceeds relating to such loss shall be paid over
to the Mortgagor; provided that the Mortgagor shall, promptly after any such
damage, repair all such damage regardless of whether any insurance proceeds have
been received or whether such proceeds, if received, are sufficient to pay for
the costs of repair.

      (c) In the event of foreclosure of this Mortgage or other transfer of
title to the Mortgaged Property, all right, title and interest of the Mortgagor
in and to any insurance policies then in force shall pass to the purchaser or
grantee.

      (d) The Mortgagor may maintain insurance required under this Mortgage by
means of one or more blanket insurance policies maintained by the Mortgagor;
provided, however, that (A) any such policy shall specify, or the Mortgagor
shall furnish to the Mortgagee a written statement from the insurer so
specifying, the maximum amount of the total insurance afforded by such blanket
policy that is allocated to the Premises and the other Mortgaged Property and
any sublimits in such blanket policy applicable to the Premises and the other
Mortgaged Property, (B) each such blanket policy stall include an endorsement
providing that, in the event of a loss resulting from an insured peril,
insurance proceeds shall be allocated to the Mortgaged Property in an amount
equal to the coverages required to be maintained by the Mortgagor as provided
above and (C) the protection afforded under any such blanket policy shall

<PAGE>
                                                                              10

      10. Restoration. The Mortgagor shall use all insurance proceeds and all
condemnation, proceeds and awards to promptly restore the Mortgaged Property to
its condition prior to such casualty or condemnation, (giving effect to the
remaining configuration of the Premises after such condemnation) and in
compliance with all Legal Requirements.

      11. Leases. (a) The Mortgagor shall not (i) execute an assignment or
pledge of any Lease relating to all or any portion of the Mortgaged Property
other than in favor of the Mortgagee, or (ii) except as expressly permitted
under the Credit Agreement, without the prior written consent of the Mortgagee,
execute any Lease of the Mortgaged Property or permit to exist any Lease of any
of the Mortgaged Property not already in existence prior to the date of this
Mortgage.

      (b) As to any Lease consented to by the Mortgagee, the Mortgagor shall:

            (i) promptly perform all of the provisions of the Lease on the part
of the lessor thereunder to be performed;

            (ii) promptly enforce all of the provisions of the Lease on the part
of the lessee thereunder to be performed;

            (iii) appear in and defend any action or proceeding arising under or
in any manner connected with the Lease or the obligations of the Mortgagor as
lessor or of the lessee thereunder;

            (iv) exercise, within 10 days after a written request by the
Mortgagee, any right to request from the lessee a certificate with respect to
the status thereof;

            (v) simultaneously deliver to the Mortgagee copies of any notices of
default which the Mortgagor may at any time forward to or receive from the
lessee;

            (vi) promptly deliver to the Mortgagee a fully executed counterpart
of the Lease; and

            (vii) promptly deliver to the Mortgagee, upon the Mortgagee's
request, an assignment of the Mortgagor's interest under such Lease.

      (c) The Mortgagor shall deliver to the Mortgagee, within 10 days after a
written request by the Mortgagee, which request shall not be made by Mortgagee
more frequently than twice in any twelve month period, a written statement,
certified by the Mortgagor as being true, correct and complete, containing the
names of all lessees and other occupants of the Mortgaged Property, the terms of
all Leases and the spaces occupied and rentals payable thereunder and a list of
all Leases which are then in default, including the nature and magnitude of the
default; such statement shall be accompanied by credit information with respect
to the lessees and such other information as the Mortgagee may reasonably
request.

<PAGE>
                                                                              12

      13. Mortgagee's Right to Perform. If the Mortgagor fails to perform any of
the covenants or agreements of the Mortgagor, the Mortgagee, without waiving or
releasing the Mortgagor from any obligation or default under this Mortgage, may,
at any time (but shall be under no obligation to) pay or perform the same, and
the amount or cost thereof, with interest at the Default Rate from the date of
payment by Mortgagee, shall immediately be due from the Mortgagor to the
Mortgagee and the same shall be secured by this Mortgage and shall be a lien on
the Mortgaged Property prior to any right, title to, interest in or claim upon
the Mortgaged Property attaching subsequent to the lien of this Mortgage. No
payment or advance of money by the Mortgagee under this Section shall be deemed
or construed to cure the Mortgagor's default or waive any right or remedy of the
Mortgagee.

      14. Hazardous Material. (a) Mortgagor hereby represents and warrants to
Mortgagee those representations, to the extent applicable to it, set forth in
Section 7.14 of the Credit Agreement.

      (b) Mortgagor covenants that it will perform the obligations, to the
extent applicable to it, set forth in Section 8.1.8 of the Credit Agreement.

      15. Events of Default. The occurrence of an Event of Default under the
Credit Agreement shall constitute an Event of Default hereunder.

      16. Remedies. (a) Upon the occurrence of any Event of Default, in addition
to any other rights and remedies the Mortgagee may have pursuant to the
Financing Documents, or as provided by law, either or both of the following
actions may be taken: (i) with the consent of the Required Secured Parties (as
defined in the Collateral Agency and Intercreditor Agreement), the Mortgagee
may, or upon the request of the Required Secured Parties, the Mortgagee shall,
by notice to the Mortgagor declare the Commitments to be terminated forthwith,
whereupon the Commitments shall immediately terminate: and (ii) with the
consent of the Required Secured Parties, the Mortgagee may, or upon the request
of the Required Secured Parties, the Mortgagee shall, by notice to the
Mortgagor, declare the Loans (with accrued interest thereon) and all other
amounts owing under the Credit Agreement and the other Financing Documents to be
due and payable forthwith. Except as expressly provided above in Section 15 and
in this Section, presentment, demand, protest and all other notices of any kind
are hereby expressly waived. In addition, upon the occurrence of any Event of
Default, the Mortgagee may immediately take such action, without notice or
demand, as it deems advisable to protect and enforce its rights against the
Mortgagor and in and to the Mortgaged Property, including, but not limited to,
the following actions, each of which may be pursued concurrently or otherwise,
at such time and in such manner as the Mortgagee may determine, in its sole
discretion, without impairing or otherwise affecting the other rights and
remedies of the Mortgagee:

      (i) The Mortgagee may, to the extent permitted by applicable law, (A)
institute and maintain an action of mortgage foreclosure against all or any part
of the Mortgaged Property, (B) institute and maintain an action on the
Obligations, (C) sell all or part of the Mortgaged Property (the Mortgagor
expressly granting to the Mortgagee the power of sale), or (D) take such other
action at law or in equity for the enforcement of this Mortgage or any of the
Financing Documents as the law may allow. The Mortgagee may proceed in any such

<PAGE>
                                                                              14

without any prior proceedings and my include the costs of the Mortgagee.
Judgment may be entered pursuant to the foregoing authority on the basis of an
affidavit made on the Mortgagee's behalf and setting forth the relevant facts,
of which facts such affidavit shall be conclusive evidence, and if a true copy
of this Mortgage is filed in any action for such judgment it shall not be
necessary to file the original of this Mortgage.

      17. Right of the Mortgage to Credit Sale. Upon the occurrence of any sale
made under this Mortgage, whether made under the power of sale or by virtue of
judicial proceedings or of a judgment or decree of foreclosure and sale, the
Mortgagee may bid for and acquire the Mortgaged Property or any part thereof. In
lieu of paying cash therefor, the Mortgagee may make settlement for the purchase
price by crediting upon the Obligations or other sums secured by this Mortgage
the net sales price after deducting therefrom the expenses of sale and the cost
of the action and any other sums which the Mortgagee is authorized to deduct
under this Mortgage. In such event, this Mortgage, the Credit Agreement, the
Guarantee and Collateral Agreement and document evidencing expenditures secured
hereby may be presented to the person or persons conducting the sale in order
that the amount so used or applied may be credited upon the Obligations as
having been paid.

      18. Appointment of Receiver. If an Event of Default shall have occurred
and be continuing, the Mortgagee as a matter of right and without notice to the
Mortgagor, unless otherwise required by applicable law, and without regard to
the adequacy or inadequacy of the Mortgaged Property or any other collateral as
security for the Obligations or the interest of the Mortgagor therein, shall
have the right to apply to any court having jurisdiction to appoint a receiver
or receivers or other manager of the Mortgaged Property, and the Mortgagor
hereby irrevocably consents to such appointment and waives notice of any
application therefor (except as may be required by law). Any such receiver or
receivers shall have all the usual powers and duties of receivers in like or
similar cases and all the powers and duties of the Mortgagee in case of entry as
provided in this Mortgage, including, without limitation and to the extent
permitted by law, the right to enter into leases of all or any part of the
Mortgaged Property, and shall continue as such and exercise all such powers
until the date of confirmation of sale of the Mortgaged Property unless such
receivership is sooner terminated.

      19. Extension, Release, etc. (a) Without affecting the lien or charge of
this Mortgage upon any portion of the Mortgaged Property not then or theretofore
released as security for the full amount of the Obligations, the Mortgagee may,
from time to time and without notice, agree to (i) release any person liable for
the Obligations, (ii) extend the maturity or alter any of the terms of the
Obligations or any guaranty thereof, (iii) grant other indulgences, (iv) release
or reconvey, or cause to be released or reconveyed at any time at the
Mortgagee's option any parcel, portion or all of the Mortgaged Property, (v)
take or release any other or additional security for any obligation herein
mentioned, or (vi) make compositions or other arrangements with debtors in
relation thereto. If at any time this Mortgage shall secure less than all of the
principal amount of the Obligations, it is expressly agreed that any repayments
of the principal amount of the Obligations shall not reduce the amount of the
lien of this Mortgage until the lien amount shall equal the principal amount of
the Obligations outstanding.

<PAGE>
                                                                              16

form reasonably satisfactory to the Mortgagee, covering all or any part of the
Mortgaged Property and will further execute, acknowledge and deliver, or cause
to be executed, acknowledged and delivered, any financing statement, affidavit,
continuation statement or certificate or other document as the Mortgagee may
reasonably request in order to perfect, preserve, maintain, continue or extend
the security interest under and the priority of this Mortgage and such security
instrument. The Mortgagor further agrees to pay to the Mortgagee on demand all
costs and expenses incurred by the Mortgagee in connection with the preparation,
execution, recording, filing and re-filing of any such document and all
reasonable costs and expenses of any record searches for financing statements
the Mortgagee shall reasonably require. If the Mortgagor shall fail to furnish
any financing or continuation statement within 10 days after written request by
the Mortgagee, then pursuant to the provisions of the Code, the Mortgagor hereby
authorizes the Mortgagee, without the signature of the Mortgagor, to execute and
file any such financing and continuation statements. The filing of any financing
or continuation statements in the records relating to personal property or
chattels shall not be construed as in any way impairing the right of the
Mortgagee to proceed against any personal property encumbered by this Mortgage
as real property, as set forth above.

      21. Assignment of Rents. The Mortgagor hereby assigns to the Mortgagee the
Rents as further security for the payment and performance of the Obligations,
and the Mortgagor grants to the Mortgagee the right to enter the Mortgaged
Property for the purpose of collecting the same and to let the Mortgaged
Property or any part thereof, and to apply the Rents on account of the
Obligations. The foregoing assignment and grant is present and absolute and
shall continue in effect until the Obligations are paid and performed in full
and all Commitments are terminated, but the Mortgagee hereby waives the right
to enter the Mortgaged Property for the purpose of collecting the Rents and the
Mortgagor shall be entitled to collect, receive, use and retain the Rents until
the occurrence and continuance of an Event of Default under this Mortgage; such
right of the Mortgagor to collect, receive, use and retain the Rents may be
revoked by the Mortgagee upon the occurrence and continuance of any Event of
Default under this Mortgage by giving not less than five days' written notice of
such revocation to the Mortgagor; in the event such notice is given, the
Mortgagor shall pay over to the Mortgagee, or to any receiver appointed to
collect the Rents and any lease security deposits. The Mortgagor shall not
accept prepayments of installments of Rent to become due for a period of more
than one month in advance (except for security deposits and estimated payments
of percentage rent, if any).

      22. Trust Funds. All lease security deposits of the Real Estate shall be
treated as trust funds not to be commingled with any other funds of the
Mortgagor. Within 10 days after request by the Mortgagee which request shall not
be made more frequently than twice in any twelve month period, the Mortgagor
shall furnish the Mortgagee reasonably satisfactory evidence of compliance with
this subsection, together with a statement of all lease security deposits by
lessees and copies of all Leases not previously delivered to the Mortgagee,
which statement shall be certified by the Mortgagor.

      23. Additional Rights. The holder of any subordinate lien on the Mortgaged
Property shall have no right to terminate any Lease whether or not such Lease is
subordinate to this Mortgage nor shall any holder of any subordinate lien join
any tenant under any Lease in any action to foreclose the lien or modify,
interfere with, disturb or terminate the rights of any tenant

<PAGE>
                                                                              18

      28. Remedies Not Exclusive. The Mortgagee shall be entitled to enforce
payment and performance of the Obligations and to exercise all rights and powers
under this Mortgage or under any of the other Financing Documents or other
agreement or any laws now or hereafter in force, notwithstanding some or all of
the Obligations may now or hereafter be otherwise secured, whether by mortgage,
security agreement, pledge, lien, assignment or otherwise. Neither the
acceptance of this Mortgage nor its enforcement, shall prejudice or in any
manner affect the Mortgagee's right to realize upon or enforce any other
security now or hereafter held by the Mortgagee, it being agreed that Mortgagee
shall be entitled to enforce this Mortgage and any other security now or
hereafter held by Mortgagee in such order and manner as the Mortgagee may
determine in its absolute discretion. No remedy herein conferred upon or
reserved to the Mortgagee is intended to be exclusive of any other remedy herein
or by law provided or permitted, but each shall be cumulative and shall be in
addition to every other remedy given hereunder or now or hereafter existing at
law or in equity or by statute. Every power or remedy given by any of the
Financing Documents to the Mortgagee or to which it may otherwise be entitled,
may be exercised, concurrently or independently, from time to time and as often
as may be deemed expedient by the Mortgagee. In no event shall the Mortgagee, in
the exercise of the remedies provided in this Mortgage (including, without
limitation, in connection with the assignment of Rents to the Mortgagee, or the
appointment of a receiver and the entry of such receiver on to all or any part
of the Mortgaged Property), be deemed a "mortgagee in possession," and the
Mortgagee shall not in any way be made liable for any act, either of commission
or omission, in connection with the exercise of such remedies.

      29. Multiple Security. If (a) the Premises shall consist of one or more
parcels, whether or not contiguous and whether or not located in the same
county, or (b) in addition to this Mortgage, the Mortgagee shall now or
hereafter hold one or more additional mortgages, liens, deeds of trust or other
security (directly or indirectly) for the Obligations upon other property in the
State in which the Premises are located (whether or not such property is owned
by the Mortgagor or by others) or (c) both the circumstances described in
clauses (a) and (b) shall be true, then to the fullest extent permitted by law,
the Mortgagee may, at its election, commence or consolidate in a single
foreclosure action all foreclosure proceedings against all such collateral
securing the Obligations (including the Mortgaged Property), which action may be
brought or consolidated in the courts of any county in which any of such
collateral is located. The Mortgagor acknowledges that the right to maintain a
consolidated foreclosure action is a specific inducement to the Mortgagee to
extend the Obligations and the Mortgagor expressly and irrevocably waives any
objections to the commencement or consolidation of the foreclosure proceedings
in a single action and any objections to the laying of venue or based on the
grounds of forum non conveniens which it may now or hereafter have. The
Mortgagor further agrees that if the Mortgagee shall be prosecuting one or more
foreclosure or other proceedings against a portion of the Mortgaged Property or
against any collateral other than the Mortgaged Property, which collateral
directly or indirectly secures the Obligations, or if the Mortgagee shall have
obtained a judgment of foreclosure and sale or similar judgment against such
collateral, then, whether or not such proceedings are being maintained or
judgments were obtained in or outside the State in which the Premises are
located, the Mortgagee may commence or continue foreclosure proceedings and
exercise its other remedies granted in this Mortgage against all or any part of
the Mortgaged Property and the Mortgagor waives any objections to the
commencement or continuation of a foreclosure of this Mortgage or exercise of
any other

<PAGE>
                                                                              20

State of New York, without regard to principles of conflict of law, and for
purposes of consistency, the Mortgagor agrees that in any in personam proceeding
related to this Mortgage the rights of the parties to this Mortgage shall also
be governed by and construed in accordance with the laws of the State of New
York governing contacts made and to be performed in that State, without regard
to principle of conflict of law.

      33. Certain Definitions. Unless the context clearly indicates a contrary
intent or unless otherwise specifically provided herein, words used in this
Mortgage shall be used interchangeably in singular or plural form and the word
"Mortgagor" shall mean "each Mortgagor or any subsequent owner or owners of the
Mortgaged Property or any part thereof or interest therein," the word
"Mortgagee" shall mean "Mortgagee or any successor collateral agent for the
Secured Parties," the words "Guarantee and Collateral Agreement" shall mean "the
Guarantee and Collateral Agreement, the Credit Agreement or any other evidence
of indebtedness secured by this Mortgage," the word "person" shall include any
individual, corporation, partnership, trust, unincorporated association,
government, governmental authority, or other entity, and the words "Mortgaged
Property" shall include any portion of the Mortgaged Property or interest
therein. Whenever the context may require, any pronoun used herein shall include
the corresponding masculine, feminine or neuter forms, and the singular form of
nouns and pronouns shall include the plural and vice versa. The captions in this
Mortgage are for convenience or reference only and in no way limit or amplify
the provisions hereof.

      34. Industrial Plant Mortgage. This Mortgage is intended to be an
assembled industrial plant mortgage within the broadest interpretation of the
"assembled industrial plant mortgage doctrine" under the laws of the
Commonwealth of Pennsylvania.

      35. Future Advances. This Mortgage is executed and delivered to secure,
among other things, future advances and re-advances in accordance with the
Credit Agreement. It is understood and agreed that this Mortgage secures present
and future advances and re-advances in accordance with the Credit Agreement made
for the benefit of the Mortgagor and that the lien of such future advances and
re-advances shall relate back to the date of this Mortgage, and the Mortgagor
and the Mortgagee intend that this Mortgage be an Open-End Mortgage as described
in 42 Pa.C.S.A. ss.8143 and as such be entitled to all benefits under 42
Pa.C.S.A ss.8143.

      36. Purchase Money Mortgage. This is a purchase money mortgage and shall
be entitled to all benefits as such under the lien priority provisions of the
Pennsylvania Judicial Code, 42 Pa.C.S.A. ss.8141, as amended.

      37. Receipt of Copy. The Mortgagor acknowledges tat it has received a true
copy of this Mortgage.
<PAGE>

      This Mortgage has been duly executed by the Mortgagor on March 18, 1999
and is intended to be effective as of March 18, 1999.

ATTEST                                  EME HOMER CITY GENERATION L.P.,
[corporate seal]                        a Pennsylvania limited partnership

By: /s/ Kevin M. Smith                  By: MISSION ENERGY WESTSIDE, INC.,
    ------------------------------          a California corporation,
    Name: Kevin M. Smith                    its general partner
    Title: Treasurer

                                            By: /s/ Steven D. Eisenberg
                                                --------------------------------
                                                Name: Steven D. Eisenberg
                                                Title: Vice President

      The address of the within-named Mortgagee is:

                    United States Trust Company of New York
                    114 West 47th Street, 25th Floor
                    New York, New York 10036

                                        For the Mortgagee

                                        ----------------------------------------
                                        Print Name: Daniel E. Karp as counsel
                                        for Collateral Agent

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