Execution Copy

                      MUTUAL GENERAL RELEASE AND AGREEMENT

          THIS MUTUAL GENERAL RELEASE AND AGREEMENT ("Release") dated as of July
1, 1998, by and between NIAGARA MOHAWK POWER CORPORATION, a New York corporation
("NMPC"),  and SELKIRK  COGEN  PARTNERS,  L.P., a Delaware  limited  partnership
("Selkirk").  Capitalized  terms used herein and not  otherwise  defined  herein
shall have the  meanings  ascribed  to such  terms in the  Master  Restructuring
Agreement (as hereinafter defined).  (Selkirk and NMPC are collectively referred
to herein as the "Parties" and individually referred to as a "Party.")

                                    RECITALS

          (A) NMPC and Selkirk are parties to, among other agreements, a certain
power purchase  agreement  described on Schedule 1 hereto (referred to herein as
the "Existing PPA") pursuant to which NMPC purchases power produced by Selkirk's
approximately 79.9 MW co-generation  facility located in Selkirk,  New York (the
"Project"); and

          (B) NMPC and Selkirk, among others, have entered into a certain Master
Restructuring  Agreement,  dated as of July 9,  1997,  as amended  (the  "Master
Restructuring  Agreement"  or "MRA"),  pursuant to Sections 8.8 and 9.8 of which
NMPC and the Selkirk have agreed to execute and deliver this Release; and

          (C) NMPC and Selkirk  have  modified  the terms of the Existing PPA by
entering  into an  Amended  and  Restated  Agreement  dated  as of July 1,  1998
("Restated Contract") in accordance with Section 3.2 of the MRA, effective as of
the Effective Time (subject to Selkirk's right to delay the effectiveness of the
Restructuring  with  respect to it  pursuant  to  Section  8.15 of the MRA) (the
Effective  Time as it may be  extended  with  respect to Selkirk,  the  "Selkirk
Effective Time").

          NOW,  THEREFORE,  in consideration  of the foregoing  premises and for
other good and  valuable  consideration,  the receipt  and  adequacy of which is
hereby acknowledged, the Parties hereby agree as follows, in each case effective
as of the Selkirk Effective Time:

          1.  Release  by the  Parties.  NMPC  and  Selkirk  hereby  agree  that
effective as of Selkirk Effective Time,  without any further notice or action on
the part of NMPC or Selkirk and except as set forth in Section 2 hereof, (a) the
Existing  PPA  shall  be  irrevocably  amended  and  restated  by  the  Restated
Agreement;  (b) all rights and privileges  granted,  accruing or inuring to each
Party  pursuant  to the  Existing  PPA shall be  irrevocably  superseded  by the
Restated  Agreement;  (c) all  obligations  and duties  owed or  required by the
Existing  PPA to be  performed  for or on behalf of one Party by any other Party
thereto  shall be  irrevocably  waived and  released;  and (d) each Party to the
Existing PPA and its respective predecessors and successors in interest, agents,
directors,  officers,  partners,  trustees,  employees and affiliates,  shall be
irrevocably  released and forever discharged from 

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all manner of actions,  causes of action, suits, debts, sums of money, accounts,
reckonings,  bonds,  bills,  covenants,  contracts,  controversies,  agreements,
judgments  claims and demands  whatsoever,  in law or equity,  known or unknown,
which any other Party ever had,  now has or  hereafter  can,  shall or may have,
based upon or by reason of any matter,  cause or thing related to or arising out
of the Existing  PPA. NMPC hereby  acknowledges  and agrees that the Consent and
Agreement, dated as of October 23, 1992 (the "Consent"), among NMPC, Selkirk and
the bank party thereto,  as confirmed by the Confirmation  Agreement,  effective
May 9, 1994 (the "Confirmation"),  among NMPC, Selkirk and the entities thereto,
shall  continue in effect with respect to the Restated  Agreement and NMPC shall
execute and deliver such further documentation as Selkirk may reasonably request
evidencing  the  foregoing  in  connection   with  the   effectiveness   of  the
Restructuring  for  Selkirk.  NMPC hereby  consents to the  assignment  of those
provisions  of the MRA which by the terms of the MRA  survive  the  Consummation
Date until fully performed (the "MRA Surviving  Provisions") and this Release by
Selkirk to Banker's  Trust  Company,  as  Collateral  Agent,  as security  under
Selkirk's  financing  agreements  and agrees,  for the benefit of the Collateral
Agent and for the purposes of the Consent and the Confirmation, that each of the
MRA  Surviving  Provisions  and this  Release  shall be deemed to be an Assigned
Agreement  (as  defined in the  Consent and the  Confirmation).  Selkirk  hereby
represents and warrants to NMPC that, upon Selkirk's  delivery of notice to NMPC
that the Indenture Approval has been obtained,  the amendment and restatement of
the  Existing  PPA by the  Restated  PPA  and  the  termination  of the  License
Agreement,  dated  October  23,  1992,  between  Selkirk and NMPC will not be in
conflict  with and will not  constitute,  with or without the passage of time or
giving of notice,  or both, a default under  Selkirk's  Trust  Indenture and the
other financing agreements related thereto.

         2.  Certain  Claims  Not  Released.   Nothing  contained  herein  shall
constitute a waiver or release of any claims,  liabilities  or  obligations  (i)
arising out of or in  connection  with this  Release,  (ii) arising out of or in
connection  with any  litigation or regulatory  proceedings  which are not to be
dismissed and withdrawn (or effectively  withdrawn) by NMPC or Selkirk  pursuant
to Sections  8.8(b) and 9.8(b) of the MRA,  (iii) unless  dismissed or withdrawn
pursuant  to the  Section  8.8(b)  or 9.8(b)  of the MRA,  arising  out of or in
connection  with any payment  due to Selkirk  whether or not  disputed,  for any
power or services  purchased by NMPC,  or any payment due to NMPC whether or not
disputed,  for any  services  provided by NMPC,  pursuant to the  Existing  PPA,
provided  that if such  payment  relates  to any period  prior to May 10,  1997,
Selkirk's or NMPC's, as the case may be,  entitlement to such payment shall have
been set forth in a writing given to NMPC or Selkirk,  as the case may be, on or
before  June 15,  1997 and (iv)  arising  pursuant  to Section  8.15 and Section
12.4(d) or any other  provision of the MRA which by the terms of the MRA survive
the Consummation  Date until fully performed.  NMPC and Selkirk  acknowledge and
agree that in  accordance  with  Section 1 hereof all  claims,  liabilities  and
obligations  relating  to  tracking,   adjustment  or  advance  payment  account
provisions under the Existing PPA (including  without  limitation the Adjustment
Account,  the Tax Carrying  Charge Account or the  Performance  Account (as each
such term is defined  in the  Existing  PPA))  shall be  extinguished  as of the
Selkirk  Effective  Time,  any and all letters of credit  provided by Selkirk in
connection  with the  Existing  PPA shall be  returned to Selkirk on the 

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Selkirk Effective Time, and the License Agreement, dated as of October 23, 1992,
entered  into by Selkirk and NMPC in  accordance  with the Existing PPA shall be
deemed terminated as of the Selkirk Effective Time.

         3.  Reconciliation of Certain Amounts.  Pursuant to Section 8.15 of the
MRA,  the  Parties  shall  use the  methodology  set  forth  in  Schedule  2, to
simultaneously reconcile between them in cash on and as of the Selkirk Effective
Time any  payments  made  pursuant to the Existing PPA which are in excess of or
less than payments  that would have been made pursuant to the Restated  Contract
had such  Restated  Contract  been in effect from July 1, 1998 until the Selkirk
Effective Time.

         4. Amendments.  This Release may not be amended except by an instrument
in writing and signed by the Party  against whom such  amendment is sought to be
enforced.

         5.  Successors  and Assigns.  The terms and  conditions of this Release
shall inure to the benefit of and be binding upon the respective  successors and
assigns of the Parties hereto.

         6. Governing Law. This Release,  including the validity  hereof and the
rights  and  obligations  of the  Parties  hereunder,  and  all  amendments  and
supplements hereof and all waivers and consents hereunder, shall be construed in
accordance  with and governed by the domestic  substantive  laws of the State of
New  York  without  giving  effect  to any  choice  of law or  conflicts  of law
provision or rule that would cause the  application of the domestic  substantive
laws of any other jurisdiction.

         7.  Severability.  If any  provisions of this Release as applied to any
part or to any  circumstance  shall  be  adjudged  by a court to be  invalid  or
unenforceable,  the same  shall in no way  affect  any other  provision  of this
Release,  the  application of such provision in any other  circumstances  or the
validity or enforceability of this Release.

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          IN WITNESS  WHEREOF,  the Parties hereto have entered into this Mutual
General Release and Agreement as of the date first above written.

NIAGARA MOHAWK POWER CORPORATION

By:  /s/Clement E. Nadeau
     ---------------------------
Its: Vice President

SELKIRK COGEN PARTNERS, L.P.
  By:  JMC Selkirk, Inc., managing general partner


By:  /s/George J. Grunbeck
     ---------------------------
Its: Vice President







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