SKADDEN, ARPS, SLATE, MEAGHER & FLOM LLP
                                FOUR TIMES SQUARE
                               NEW YORK, NY 10036

                                 (212) 735-3000

                                               February 28, 2000

Edison Mission Holdings Co.
18101 Von Karman Avenue
Irvine, California 92612

                           Re: Edison Mission Holdings Co.
                               REGISTRATION STATEMENT ON FORM S-4

Ladies and Gentlemen:

          We are acting as special counsel to Edison Mission Holdings Co., a
California corporation (the "Company"), in connection with the public offering
of $300,000,000 aggregate principal amount of the Company's 8.137% Senior
Secured Bonds due 2019 and of $530,000,000 aggregate principal amount of the
Company's 8.734% Senior Secured Bonds due 2026 (collectively, the "Exchange
Bonds"), which are guaranteed, (A) on a senior secured basis pursuant to (i) the
Guarantee and Collateral Agreement dated as of March 18, 1999, as amended by
Amendment No. 1 dated as of May 27, 1999 (as so amended, the "Subsidiary
Guarantees"), by Edison Mission Finance Co., a California corporation ("Edison
Finance"), Homer City Property Holdings, Inc., a California corporation ("Homer
City Property"), Mission Energy Westside, Inc., a California corporation
("Mission Energy Westside"), Chestnut Ridge Energy Company, a California
corporation ("Chestnut Ridge") (collectively, the "California Subsidiaries") and
EME Homer City Generation L.P., a Pennsylvania limited partnership ("EME Homer
City" and, collectively with the California Subsidiaries, the "Subsidiary
Guarantors"); and (ii) the Credit Support Guarantee, dated as of March 18, 1999,
as amended by Amend ment No. 1 dated as of May 27, 1999 (as so amended, the
"Credit Support Guarantee"), by Edison Mission Energy, a California corporation
("EME"); and (B) pursuant to the Bond Debt Service Reserve Guarantee, dated as
of May 27, 1999, by EME (the "Bond Debt Service Reserve Guarantee" and,
collectively with the Credit Support Guarantee, the "EME Guarantees"). The
Exchange Bonds, together with the Subsidiary Guarantees and the EME Guarantees,
are referred to herein as the "Securities". The Exchange





Edison Mission Holdings Co.
February 28, 2000
Page 2

Bonds are to be issued pursuant to an exchange offer (the "Exchange Offer") in
exchange for a like principal amount of the issued and outstanding 8.137% Senior
Secured Bonds due 2019 and 8.734% Senior Secured Bonds due 2026 of the Company
(collectively, the "Original Bonds") under the Indenture, dated as of May 27,
1999 (the "Indenture"), between the Company and United States Trust Company of
New York, as Trustee (the "Trustee"), as contemplated by the Registration Rights
Agreement, dated as of May 27, 1999 (the "Registration Rights Agreement"), by
and among the Company, Lehman Brothers Inc., Credit Suisse First Boston
Corporation, Salomon Smith Barney Inc. and SG Cowen Securities Corp.

          This opinion is being furnished in accordance with the requirements of
Item 601(b)(5) of Regulation S-K under the Securities Act of 1933, as amended
(the "Act").

          In connection with this opinion, we have examined originals or copies,
certified or otherwise identified to our satisfaction, of (i) the Registration
Statement on Form S-4 relating to the Securities filed with the Securities and
Exchange Commission (the "Commission") on December 3, 1999 under the Act (the
"Registration Statement"); (ii) Amendment No. 1 to the Registration Statement
filed with the Commission on February 8, 2000 under the Act ("Amendment No. 1");
(iii) Amendment No. 2 to the Registration Statement to be filed with the
Commission on the date hereof under the Act ("Amendment No. 2"); (iv) an
executed copy of the Registration Rights Agreement; (v) an executed copy of the
Indenture; (vi) an executed copy of the Subsidiary Guarantees, the Credit
Support Guarantee and the Bond Debt Service Reserve Guarantee; (vii) the
Articles of Incorporation of the Company, EME and each of the California
Subsidiaries, each as amended to date; (viii) the By-Laws of the Company, EME
and each of the California Subsidiaries, each as amended to date; (ix) certain
resolutions adopted by the Board of Directors of the Company relating to the
Exchange Offer, the issuance of the Original Bonds and the Exchange Bonds, the
Indenture and related matters; (x) certain resolutions adopted by the Boards of
Directors of each of EME and the California Subsidiaries relating to, among
other things the issuance of the Subsidiary Guarantees by the California
Subsidiaries and the issuance of the EME Guarantees by EME; (xi) the Form T-1 of
the Trustee filed as an exhibit to the Registration Statement; and (xii) the
form of the Exchange Bonds. We have also examined originals or copies, certified
or otherwise identified to our satisfaction, of such records of the Company, EME
and each of the California Subsidiaries and such agreements, certificates of
public officials, certificates of officers or other representatives





Edison Mission Holdings Co.
February 28, 2000
Page 3

of the Company, EME and each of the California Subsidiaries and others, and such
other documents, certificates and records as we have deemed necessary or
appropriate as a basis for the opinions set forth herein.

          In our examination, we have assumed the legal capacity of all natural
persons, the genuineness of all signatures, the authenticity of all documents
submitted to us as originals, the conformity to original documents of all
documents submitted to us as certified, conformed or photostatic copies and the
authenticity of the originals of such latter documents. In making our
examination of executed documents or documents to be executed, we have assumed
that the parties thereto, other than the Company, EME and the California
Subsidiaries, had or will have the power, corporate or other, to enter into and
perform all obligations thereunder and have also assumed the due authorization
by all requisite action, corporate or other, and execution and delivery by such
parties of such documents and the validity and binding effect thereof on such
parties. As to any facts material to the opinions expressed herein which we have
not independently established or verified, we have relied upon statements and
representations of officers and other representatives of the Company, EME, the
Subsidiary Guarantors and others.

          Our opinion set forth herein is limited to California corporate law
and the laws of the State of New York which are normally applicable to
transactions of the type contemplated by the Exchange Offer and, to the extent
that judicial or regulatory orders or decrees or consents, approvals, licenses,
authorizations, validations, filings, recordings or registrations with
governmental authorities are relevant, to those required under such laws (all of
the foregoing being referred to as "Opined on Law"). We do not express any
opinion with respect to the law of any jurisdiction other than Opined on Law or
as to the effect of any such law on the opinions herein stated.

          Based upon and subject to the foregoing and the limitations,
qualifications, exceptions and assumptions set forth herein, we are of the
opinion that:

     1. When the Exchange Bonds (in the form examined by us) have been duly
executed and authenticated in accordance with the terms of the Indenture and
have been delivered upon consummation of the Exchange Offer against receipt of
Original Bonds surrendered in exchange





Edison Mission Holdings Co.
February 28, 2000
Page 4

therefor in accordance with the terms of the Exchange Offer, the Exchange Bonds
will constitute valid and binding obligations of the Company, enforce able
against the Company in accordance with their terms, except to the extent that
enforcement thereof may be limited by (1) bankruptcy, insolvency,
reorganization, moratorium, fraudulent conveyance or other similar laws now or
hereafter in effect relating to creditors' rights generally and (2) general
principles of equity (regardless of whether enforceability is considered in a
proceeding at law or in equity).

     2. When the Exchange Bonds (in the form examined by us) have been duly
executed and authenticated in accordance with the terms of the Indenture and
have been delivered upon consummation of the Exchange Offer against receipt of
Original Bonds surrendered in exchange therefor in accordance with the terms of
the Exchange Offer and assuming the due authorization, execution and delivery of
the Subsidiary Guarantee by EME Homer City under the laws of the Commonwealth of
Pennsylvania, the Subsidiary Guarantees will constitute valid and binding
obligations of each of the Subsidiary Guarantors, enforceable against the
Subsidiary Guarantors in accordance with their terms, except to the extent that
enforcement thereof may be limited by (1) bankruptcy, insol vency,
reorganization, moratorium, fraudulent conveyance or other similar laws now or
hereafter in effect relating to creditors' rights generally and (2) general
principles of equity (regardless of whether enforceability is considered in a
proceeding at law or in equity).

     3. When the Exchange Bonds (in the form examined by us) have been duly
executed and authenticated in accordance with the terms of the Indenture and
have been delivered upon consummation of the Exchange Offer against receipt of
Original Bonds surrendered in exchange therefor in accordance with the terms of
the Exchange Offer, the EME Guarantees will constitute valid and binding
obligations of EME, enforceable against EME in accordance with their terms,
except to the extent that enforcement thereof may be limited by (1) bankruptcy,
insolvency, reorganization, moratorium, fraudulent conveyance or other similar
laws now or hereafter in effect relating to creditors' rights generally and (2)
general principles of equity (regardless of whether enforceability is considered
in a proceeding at law or in equity).

          In rendering the opinion set forth above, we have assumed that (i) the
execution and delivery by the Company of the Indenture and the Exchange Bonds
and the performance by the Company of its obligations thereunder; (ii) the
execution and delivery by each of the Subsidiary Guarantors of the Subsidiary
Guarantees and the performance by each of the





Edison Mission Holdings Co.
February 28, 2000
Page 5

Subsidiary Guarantors of their obligations thereunder; and (iii) the execution
and delivery by EME of the EME Guarantees and the performance by EME of its
obligations thereunder, do not and will not violate, conflict with or constitute
a default under any agreement or instrument to which the Company, EME or the
Subsidiary Guarantors or their respective properties is subject, except that we
do not make this assumption for those agreements and instruments which have been
identified to us by the Company, EME or the Subsidiary Guarantors as being
material to them and which are listed as exhibits to Amendment No. 2.

          We hereby consent to the filing of this opinion with the Commission as
an exhibit to Amendment No. 2. We also consent to the reference to our firm
under the caption "Legal Matters" in the prospectus included in Amendment No. 2.
In giving this consent, we do not thereby admit that we are included in the
category of persons whose consent is required under Section 7 of the Act or the
rules and regulations of the Commis sion.

                                               Very truly yours,

                                               /s/ SKADDEN, ARPS, SLATE, MEAGHER
                                                      & FLOM LLP