Exhibit 5.1

                    SKADDEN, ARPS, SLATE, MEAGHER & FLOM LLP
                               FOUR TIMES SQUARE
                               NEW YORK, NY 10036
                                 (212) 735-3000


                                                              February 8, 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 Amendment 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 Bonds are to be issued




Edison Mission Holdings Co.
February 8, 2000
Page 2


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 to be filed with the Commission on the date hereof under the Act
("Amendment No.1"); (iii) an executed copy of the Registration Rights Agreement;
(iv) an executed copy of the Indenture; (v) an executed copy of the Subsidiary
Guarantees, the Credit Support Guarantee and the Bond Debt Service Reserve
Guarantee; (vi) the Articles of Incorporation of the Company, EME and each of
the California Subsidiaries, each as amended to date; (vii) the By-Laws of the
Company, EME and each of the California Subsidiaries, each as amended to date;
(viii) 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; (ix) 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; (x) the Form T-1 of the Trustee filed as an exhibit to the Registration
Statement; and (xi) 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 of the Company, EME and each of the




Edison Mission Holdings Co.
February 8, 2000
Page 3


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 therefor in accordance with the terms of
the Exchange Offer, the Exchange Bonds will




Edison Mission Holdings Co.
February 8, 2000
Page 4


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, the Subsidiary Guarantees will constitute valid and binding
obligations of each of the California Subsidiaries, enforceable against the
California Subsidiaries 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).

         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 California Subsidiaries of the Subsidiary
Guarantees and the performance by each of the California Subsidiaries 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




Edison Mission Holdings Co.
February 8, 2000
Page 5

not and will not violate, conflict with or constitute a default under any
agreement or instrument to which the Company, EME or the California Subsidiaries
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 California Subsidiaries as being material to them and
which are listed as exhibits to Amendment No.1.

                  We hereby consent to the filing of this opinion with the
Commission as an exhibit to Amendment No.1. We also consent to the reference to
our firm under the caption "Legal Matters" in the prospectus included in
Amendment No.1. 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 Commission.

                                            Very truly yours,

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