Exhibit 10.66

  
                   LOVETT, GAS TURBINE AND HYDROELECTRIC  
                       GENERATING FACILITIES GUARANTY 
  
           This Guaranty (this "Guaranty"), dated as of November 24, 1998,
 is given by Southern Energy, Inc., a Delaware corporation (the
 "Guarantor"), in favor of Orange and Rockland Utilities, Inc., a New York
 corporation ("O&R"). 
  
                                  RECITALS 
  
           WHEREAS, Southern Energy Lovett, L.L.C.,  a Delaware limited
 liability company and a direct or indirect wholly-owned subsidiary of the
 Guarantor ("SEL"), has entered into the Lovett Generating Station Sales
 Agreement (the "Lovett Sales Agreement"), dated as of the date hereof with
 O&R pursuant to which SEL has agreed to purchase and O&R has agreed to sell
 certain electric generating assets, as more particularly set forth therein;
 and 
  
           WHEREAS, Southern Energy NY-Gen, L.L.C. ("NY-Gen" and together
 with SEL, the "Buyers" and each individually, a "Buyer") entered into the
 Gas Turbine and Hydroelectric Generating Station Sales Agreement (the "Gas
 and Hydro Sales Agreement," together with the Lovett Sales Agreement, the
 "Asset Sales Agreements"), dated as of the date hereof with O&R, pursuant
 to which NY-Gen has agreed to purchase and O&R has agreed to sell certain
 property, as more particularly set forth therein; and 
  
           WHEREAS, Guarantor has agreed to guarantee the payment and
 performance obligations of (i) SEL under the Lovett Sales Agreements and
 (ii) NY-Gen under the Gas and Hydro Sales Agreement. 
  
           NOW, THEREFORE, the Guarantor agrees as follows: 
  
           Section 1.  Definitions.  (a)  Capitalized terms used herein
 shall have the meanings assigned to them herein or, if not defined herein,
 then such terms shall have the meanings assigned to them in the Lovett
 Sales Agreement and/or the Gas and Hydro Sales Agreement, as applicable.
  
           Section 2.  Guaranty.  (a) Guarantor hereby absolutely and
 irrevocably guarantees to O&R and its successors and permitted assigns, as
 primary obligor and not merely as a surety, that SEL shall:  (i) be bound
 by and perform (A) the provisions of Sections 3.1 (Purchase Price), 3.2
 (Purchase Price Adjustment), Section 3.4 (Proration) and Section 4.2
 (Payment of Purchase Price) of the Lovett Sales Agreement; (ii) pay (A) the
 amounts required to be paid by SEL pursuant to Article IX (Indemnification)
 of the Lovett Sales Agreement and the Indemnification provisions of each of
 the Ancillary Agreements, where applicable and (B) all other amounts
 required to be paid by SEL under the Ancillary Agreements and any other
 agreement or instrument relating thereto not described in (ii)(A) above;
 and (iii) promptly perform, observe and comply with all other obligations,
 covenants, and undertakings and representations and warranties of SEL
 contained in the Lovett Sales Agreement, the Ancillary Agreement and any
 other agreement or instrument relating thereto (all of such obligations
 collectively, the "Guaranteed Lovett Obligations").  Guarantor agrees that
 such Guaranteed Lovett Obligations shall forthwith become due and payable
 by Guarantor or be required to be performed by the Guarantor for the
 purposes of this Guaranty upon the occurrence of any event or condition
 giving rise to the obligation of SEL so to pay or be performed under the
 Lovett Sales Agreement, the Ancillary Agreements or any other agreement or
 instrument relating thereto.

                (b)  Guarantor hereby absolutely and irrevocably guarantees
 to O&R and its successors and permitted assigns, as primary obligor and not
 merely as a surety, that NY-Gen shall:  (i) be bound by and perform, (A)
 the provisions of Sections 3.1 (Purchase Price), Section 3.2 (Purchase
 Price Adjustment), Section 3.4 (Proration) and Section 4.2 (Payment of
 Purchase Price) of the Gas and Hydro Sales Agreement; (ii) pay (A) the
 amounts required to be paid by NY-Gen pursuant to Article IX
 (Indemnification) of the Gas and Hydro Sales Agreement and the
 indemnification provisions of each of the Ancillary Agreements, where
 applicable and (B) all other amounts required to be paid by NY-Gen under
 the Ancillary Agreements and any other agreement or instrument relating
 thereto not described in (ii)(A) above; and (iii) promptly perform, observe
 and comply with all other obligations, covenants, and undertakings and
 representations and warranties of NY-Gen contained in the Gas and Hydro
 Sales Agreement or any other agreement or instrument relating thereto (the
 "Guaranteed Gas and Hydro Obligations").  Guarantor agrees that such
 Guaranteed Gas and Hydro Obligations shall forthwith become due and payable
 by Guarantor or be required to be performed by the Guarantor for the
 purposes of this Guaranty upon the occurrence of any event or condition
 giving rise to the obligation of the Buyer so to pay or be performed under
 the Gas and Hydro Sales Agreement or any other agreement or instrument
 relating thereto.
  
                (c)  In the event that the Buyers shall fail to perform any
 such Guaranteed Lovett Obligations or Guaranteed Gas and Hydro Obligations
 at the times and in the manner provided in the Lovett Sales Agreement, the
 Gas and Hydro Sales Agreement, the Ancillary Agreements and any other
 agreement or instrument relating thereto, as applicable, the Guarantor,
 within thirty (30) days of receipt of written notice from O&R of a Buyer's
 failure to perform, shall duly perform or cause to be performed the same.
  
                (d)  Subject to the foregoing provisions, this Guaranty
 shall be an absolute, unconditional, present and continuing guaranty of
 payment and performance (not merely of collection or collectability) which
 shall remain in full force and effect until the first to occur of (i) the
 date that each and all of the Guaranteed Lovett Obligations and Guaranteed
 Gas and Hydro Obligations shall have been fully and satisfactorily
 discharged in accordance with the terms and provisions of the Lovett Sales
 Agreement, the Gas and Hydro Sales Agreement, the Ancillary Agreements and
 any other agreement or instrument relating thereto or (ii) such date (the
 "Attainment Date") on or after the second anniversary of the Closing Date
 (which shall mean the later of the "Closing Date," as defined in the Lovett
 Sales Agreement and the "Closing Date" as defined in the Gas and Hydro
 Sales Agreement) that the Buyers together shall have attained for at least
 four (4) consecutive fiscal quarters (A) a "net worth", as determined in
 accordance with U.S. generally accepted accounting principles and reflected
 in a balance sheet certified by an independent certified public accounting
 firm of national reputation, at least equal to an amount equal to one-third
 of the sum of the Purchase Price (as described in Section 3.1 of the Lovett
 Sales Agreement) and the Purchase Price (as described in Section 3.1 of the
 Gas and Hydro Sales Agreement).
  
           Section 3.  Guaranty Absolute.  The liability of Guarantor under
 this Guaranty shall be unaffected by:
  
                (a)  any lack of validity of the Lovett Sales Agreement or
 the Gas and Hydro Sales Agreement which is caused by an act or failure to
 act of either Buyer or the Guarantor;
  
                (b)  the occurrence or continuance of any event of
 bankruptcy, reorganization or insolvency with respect to either Buyer or
 any other Person (for purposes hereof, "Person" shall include any natural
 person, corporation, partnership, firm, association, governmental authority
 or any other entity whether acting in an individual, fiduciary or other
 capacity), or the dissolution, liquidation or winding up of either Buyer or
 any other Person;
  
                (c)  any amendment, supplement, reformation or other
 modification of the Lovett Sales Agreement or the Gas and Hydro Sales
 Agreement;
  
                (d)  the exercise, non-exercise or delay in exercising, by
 O&R or any other Person of any of their rights and remedies under this
 Guaranty, the Lovett Sales Agreement or the Gas and Hydro Sales Agreement;
  
                (e)  any permitted assignment or other transfer of this
 Guaranty by O&R or any permitted assignment or other transfer of the Lovett
 Sales Agreement or the Gas and Hydro Sales Agreement in whole or in part;
  
                (f)  any change in control of either Buyer;
  
                (g)  any sale, transfer or other disposition by Guarantor of
 any direct or indirect interest it may have in Buyer; or
  
                (h)  the absence of any notice to, or knowledge by,
 Guarantor of the existence or occurrence of any of the matters or events
 set forth in the foregoing clauses.
  
           Section 4.  Waiver.  In addition to waiving any defenses to which
 clauses (a) through (h) of Section 3 may refer:
  
                (a)  Guarantor waives, and agrees that it shall not at any
 time insist upon, plead or in any manner whatever claim or take the benefit
 or advantage of, any appraisal, valuation, stay, extension, marshalling of
 assets or redemption laws, or exemption, whether now or at any time
 hereafter in force, which may delay, prevent or otherwise affect the
 performance by Guarantor of its obligations under, or the enforcement by
 O&R of, this Guaranty.
  
                (b)  Guarantor waives all notices, diligence, presentment
 and demand (whether for nonpayment or protest or of acceptance, maturity,
 extension of time, change in nature or form of the Guaranteed Lovett
 Obligations or the Guaranteed Gas and Hydro Obligations, acceptance of
 security, release of security, composition or agreement arrive at as to the
 amount of, or the terms of, the Guaranteed Lovett Obligations or the
 Guaranteed Gas and Hydro Obligations, notice of adverse change in either
 Buyer's financial condition, or any other fact which might materially
 increase the risk to Guarantor hereunder) with respect to the Guaranteed
 Lovett Obligations or the Guaranteed Gas and Hydro Obligations which are
 not specifically provided for in the Lovett Sales Agreement or the Gas and
 Hydro Sales Agreement, and any other demands whatsoever which are not
 specifically provided for in the Lovett Sales Agreement or the Gas and
 Hydro Sales Agreement, and waives the benefit of all provisions of law
 which are in conflict with the terms of this Guaranty.
  
                (c)  Until payment and satisfaction in full of all
 Guaranteed Lovett Obligations and the Guaranteed Gas and Hydro Obligations,
 Guarantor irrevocably waives any right it may have to bring a case or
 proceeding against either Buyer by reason of their performance under this
 Guaranty or with respect to any other obligation of either Buyer to
 Guarantor, under any state or federal bankruptcy, insolvency,
 reorganization, moratorium or similar laws for the relief of debtors.

           Section 5.  Representations and Warranties.  Guarantor represents
 and warrants as follows:
  
                (a)  Due Organization.  Guarantor is a corporation duly
 organized and validly existing under the laws of Delaware.
  
                (b)  Power and Authority.  Guarantor has full corporate
 power, authority and legal right to enter into this Guaranty and to perform
 its obligations hereunder.
  
                (c)  Due Authorization.  This Guaranty has been duly
 authorized, executed and delivered by Guarantor.
  
                (d)  Enforceability.  This Guaranty constitutes the legal,
 valid and binding obligation of Guarantor enforceable against Guarantor in
 accordance with its terms, except as enforceability may be limited by
 applicable bankruptcy, insolvency, moratorium or other similar laws
 affecting creditors' rights generally.
  
                (e)  No Conflicts.  The execution and delivery by Guarantor
 of this Guaranty and the performance by Guarantor of its obligations
 hereunder will not (i) violate the provisions of Guarantor's certificate of
 incorporation or bylaws; (ii) violate the provisions of any law applicable
 to Guarantor or the transactions contemplated hereby; or (iii) result in a
 breach of or constitute a default under any agreement to which Guarantor is
 a party or by which it or its assets or property are bound which breach or
 default would have a material adverse effect on Guarantor's ability to
 perform its obligations hereunder.
  
                (f)  No Proceedings.  There is no action, suit or proceeding
 at law or in equity or by or before any governmental authority or arbitral
 tribunal now pending or, to the best knowledge of Guarantor, threatened
 against Guarantor which reasonably could be expected to have a material
 adverse effect on Guarantor's ability to perform its obligations under this
 Guaranty.
  
                (g)  No Claims.  Guarantor's obligations under this Guaranty
 are not subject to any offsets or claims of any kind against either Buyer,
 O&R or any other Person.
  
           Section 6. Repayment and Reinstatement.  If any claim is ever
 made upon O&R or any Person claiming through O&R for repayment or
 disgorgement of any amount or amounts received by O&R from SEL or NY-Gen,
 as applicable in payment of the Guaranteed Lovett Obligations or the
 Guaranteed Gas and Hydro Obligations and O&R or such Person, as the case
 may be, repays or disgorges all or any part of said amount, then,
 notwithstanding any revocation or termination of this Guaranty, Guarantor
 shall be and remain liable to O&R or such Person, as the case may be, under
 the terms of this Guaranty for the amount so repaid, to the same extent as
 if such amount had never originally been received by O&R or such Person, as
 the case may be.
  
           Section 7.  Amendments; Waivers; Etc.  Neither this instrument
 nor any term hereof may be changed, waived, discharged or terminated
 orally, but only by an instrument in writing signed by O&R and Guarantor,
 as the case may be.  No delay or failure by O&R to exercise any remedy
 against either Buyer or Guarantor will be construed as a waiver of that
 right or remedy.  No failure on the part of O&R to exercise, and no delay
 in exercising, any right hereunder shall operate as a waiver thereof, nor
 shall any single or partial exercise of any right hereunder preclude any
 other or further exercise thereof or the exercise of any other right.  The
 remedies herein provided are cumulative and not exclusive of any remedies
 provided by any applicable law.

           Section 8.  Severability.  In the event that the provisions of
 this Guaranty are claimed or held to be inconsistent with any other
 instrument evidencing or securing O&R or the Guaranteed Lovett Obligations,
 the Guaranteed Gas and Hydro Obligations, the terms of this Guaranty shall
 remain fully valid and effective.  If any one or more of the provisions of
 this Guaranty should be determined to be illegal or unenforceable, all
 other provisions shall remain effective.
  
           Section 9.  Assignment.
  
                (a)  Assignability.  Guarantor shall not have the right to
 assign any of Guarantor's rights or obligations under this Guaranty.  O&R
 may, at any time and from time to time, assign, in whole or in part, their
 respective rights hereunder to any Person to whom O&R has the right to
 assign their rights or obligations under and, pursuant to the terms of the
 Lovett Sales Agreement or the Gas and Hydro Sales Agreement, whereupon such
 assignee shall succeed to all rights of O&R hereunder, as the case may be.
  
                (b)  Successors and Assigns.  Subject to Section 9(a)
 hereof, all of the terms of this instrument shall be binding upon and inure
 to the benefit of the parties hereto and their respective successors and
 assigns.
  
           Section 10.  Addresses for Notices.  All notices and other
 communications provided for hereunder shall be given in accordance with the
 notice requirements of the Lovett Sales Agreement, the Gas and Hydro Sales
 Agreement, and if to Guarantor, at the address specified below the space
 for its execution of this Guaranty.
  
           Section 11.  Jurisdiction.
  
                (a)  To the extent permitted by applicable law, Guarantor
 hereby irrevocably submits to the jurisdiction of any state or federal
 court sitting in New York City in any action or proceeding arising out of
 or relating to this Guaranty, and Guarantor hereby irrevocably agrees that
 all claims in respect of such action or proceeding may be heard and
 determined in such a court.  Guarantor and O&R hereby irrevocably waive, to
 the fullest extent they may effectively do so, the defense of an
 inconvenient forum to the maintenance of such action or proceeding.  To the
 extent permitted by applicable law, Guarantor irrevocably consents to the
 service of any and all process in any such action or proceedings by the
 mailing of copies of such process to Guarantor at its address specified
 below the space for its execution of this Guaranty.  Guarantor agrees that
 a final judgment in any such action or proceeding shall be conclusive and
 may be enforced in other jurisdictions by suit on the judgment or in any
 other manner provided by law.
  
                (b)  To the extent that Guarantor has or hereafter may
 acquire any immunity from jurisdiction of any court or from any legal
 process otherwise consented to in paragraph (a) of this section (whether
 through service or notice, attachment prior to judgment, attachment in aid
 of execution, execution or otherwise) with respect to itself or its
 property, to the extent permitted by law, Guarantor hereby irrevocably
 waives such immunity in respect of its obligations under this Guaranty.
  
           Section 12.  Governing Law.  This Guaranty shall be governed by,
 and construed in accordance with, the laws of the state of New York except
 the choice of law rules.

           Section 13.  Entire Agreement.  This Guaranty contains the
 complete agreement of Guarantor with respect to the matters contained
 herein and supersedes all other negotiations or agreements, whether written
 or oral, with respect to the subject matter hereof.

  
           IN WITNESS WHEREOF, Guarantor has signed this Guaranty under seal
 effective as of the date first above written. 
  
                     SOUTHERN ENERGY, INC. 
  
  
                     By:   /s/ Randy Harrison  
                           _____________________________
                           Name:  Randy Harrison 
                           Title: Vice President - Project Development 
  
                           Address:  900 Ashwood Parkway 
                                     Suite 500 
                                     Atlanta, GA 30308 
  
 ACCEPTED AND AGREED: 
  
 ORANGE AND ROCKLAND UTILITIES, INC. 
  

 By:   /s/ D. Louis Peoples 
      ______________________________
      Name:   D. Louis Peoples 
      Title:  Vice Chairman and Chief 
                Executive Officer 
      Address:  One Blue Hill Plaza 
                Pearl River, New York  10965