Exhibit 10.2



                        Supplemental Retirement Agreement

     This  Agreement  (the  "Supplemental  Retirement  Agreement")  dated  as of
January 1, 2005 (the "Effective Date") between KeySpan Corporation ("KeySpan" or
the "Company") and Anthony Sartor (the "Executive") sets forth the understanding
and  agreement  of the  parties  as to  certain  additional  terms on which  the
Executive  continues  to be  employed by KeySpan.  Any  definitions  used herein
unless otherwise defined herein are defined in the Employment Agreement dated as
of January 1, 2005 between KeySpan and the Executive.

     WHEREAS,  Executive is President  of KeySpan  Services,  Inc. who became an
employee of KeySpan on January 30, 2000,  and became a participant in the ERP on
January 1, 2002 and the KeySpan Executive Supplemental Pension Plan ("KESPP") on
June 1, 2003;

     WHEREAS,  Executive may have limited  pension  benefits due to shorter than
normal  service  at  retirement  and the  Company  desires  to  grant  Executive
additional  credited pension service in the calculation of a pension benefit and
to encourage the Executive to remain in the employ of KeySpan;

     WHEREAS,  on September  10, 2004,  KeySpan's  Compensation  and  Management
Development  Committee recommended and on September 15, 2004, KeySpan's Board of
Directors  authorized  through a Resolution (the  "Resolution")  that the proper
officers provide an individual supplemental retirement agreement with Executive;

     NOW THEREFORE,  the Company and Executive  agree that Executive will accrue
additional  pension service through this Supplemental  Retirement  Agreement and
the parties agree as follows;

     1.   Upon Executive's  completion of employment  through April 1, 2008, and
          his election to retire in  accordance  with the  provisions of the ERP
          and KESPP,  Executive's pension benefit service time will be increased
          and  Executive  will be paid other retiree  benefits  pursuant to this
          Agreement.  Executive  acknowledges  that Executive will in accordance
          with the  terms and  conditions  of the ERP be  required  to retire no
          later  than the  Normal  Retirement  Date  (age  65),  as such term is
          defined in the ERP.




     2.   Executive's  supplemental  retirement  benefit will be  determined  as
          follows:

          a.   (i)  Notwithstanding  Executive's actual date of participation in
                    the KESPP, for purposes of this Agreement, Executive will be
                    deemed to be a  Participant  in the KESPP as of January  31,
                    2000.





               (ii) When Executive retires, Executive's pension benefit credited
                    service  time  will be  matched  by the  Company  by  adding
                    one-half  year of  credited  service  for each year in which
                    Executive  was a  Participant  in the KESPP.  The  aggregate
                    pension  service time,  including the matched time,  will be
                    utilized   to  compute   Executive's   pension   benefit  in
                    accordance  with the ERP's  formula  and KESPP.  The pension
                    benefit will be paid pursuant to the retirement plan annuity
                    option  elected by the Executive  under the ERP. The matched
                    service  time  provided   under  this   agreement   will  be
                    applicable to any survivor option,  if any, is elected under
                    the ERP.

     3.   a. In the event of the Executive's death in active service on or after
          the Effective Date, a survivor pension benefit for the matched service
          provided  under  this  agreement  through  the date of  death  will be
          provided to the Executive's spouse pursuant to the survivor provisions
          in the ERP and in accordance with the provisions of paragraph 2 above.
          In the event of the  Executive's  Disability as defined in the ERP and
          termination  of his  employment,  he will be vested in all  additional
          matched service through the date of termination.

     b.   If Executive terminates his employment with the Company prior to April
          1, 2008 or is terminated prior to such date for Good Cause,  Executive
          will not be eligible for any benefits pursuant to this Agreement.

     4.   a. In the event Executive's employment is terminated after a Change of
          Control, then the Company agrees that Executive shall immediately vest
          in all additional service time earned pursuant to this Agreement.  The
          service  time  provided  under  this  Agreement  will be  provided  in
          addition to any additional  pension service granted Executive pursuant
          to the Change of Control  Plan with such  additional  pension  service
          time being matched.

     b.   In the event  Executive's  employment is terminated by the Company for
          any reason other than for "Good Cause",  then the Company  agrees that
          Executive shall immediately vest in all additional service time earned
          pursuant to this Agreement.  In addition, for purposes of this pension
          calculation, Compensation shall be the Executive's Base Salary for the
          remainder  of the term  and 80% of the  Executive's  target  incentive
          payable in each year during the remainder of the Term.

     c.   In the event Executive's employment is terminated by the Executive for
          "Good  Reason",   then  the  Company   agrees  that  Executive   shall
          immediately  vest in all  additional  service time earned  pursuant to
          this Agreement up to and including the date of resignation.


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     5.   In addition,  Executive will be eligible to participate in the retiree
          medical and dental benefits  programs provided under the group retiree
          benefit plans in accordance with the terms and provisions of the group
          retiree plan  contribution  in effect at the time of retirement.  Upon
          Executive's  retirement  on  April  1,  2008,  the  Executive  will be
          required to pay the required  retiree benefit  contribution  amount to
          participate  in the plans.  The  Company  will pay to  Executive  upon
          completion of enrollment, a monthly supplemental amount grossed up for
          income taxes to pay such group retiree  benefits.  This monthly amount
          will be a fixed amount  determined at retirement based upon 50% of the
          then current group cost of the retiree medical and dental plans.  Once
          the amount of this supplement at age 65 is determined,  it will remain
          at this  amount  as a monthly  lifetime  supplemental  payment  to the
          Executive.  In the event of the  Executive's  death after  retirement,
          Executive's  spouse will  continue to receive one half of the original
          supplemental amount for a two year period. During the two year period,
          Executive's  spouse  will  pay the  full  group  rate  for  individual
          coverage. After the two year period,  Executive's spouse shall be able
          to  continue  in  the  group   retire   medical  and  dental  plan  by
          contributing the full group rate for individual coverage.

          If the  Executive  does not enroll in the group plans or retires prior
          to April 1, 2008 in accordance  with this  paragraph,  no supplemental
          payment  will  be  made  to  Executive   unless  such   retirement  or
          termination  is  attributable  to  sections  4a.,  4b or  4c  of  this
          Agreement .

     6.   Any  payment due  hereunder  will be paid from  general  assets of the
          Company and subject to all Federal State and local tax and withholding
          requirements.

     7.   KeySpan  and  Executive  agree that should  such  additional  benefits
          earned or accrued  pursuant  to this  Agreement  be  determined  to be
          subject to Section 280G of the Internal  Revenue Code,  KeySpan agrees
          that such  additional  benefits  will be  eligible  for  "Gross Up" in
          accordance with the provisions of the Change of Control Plan.

     8.   Executive  agrees not to  disclose  the terms and  conditions  of this
          Supplemental Retirement Agreement or any confidential information made
          available to or learned by Executive in the course of the  performance
          of duties at KeySpan and with  respect to the  business of KeySpan and
          described in KeySpan's Statement on Ethical Business Conduct.  Any and
          all  confidentiality  agreements and all other agreements  executed by
          Executive that contained  provisions not to disclose any  confidential
          information   are   incorporated   into  this   Agreement.   The  term
          "confidential"  means  information  disclosed  to  Executive or known,
          learned,   created  or  observed  as  a  consequence  of,  or  through
          Executive's employment by KeySpan concerning KeySpan or any subsidiary
          or  affiliated  company  which is  presently  existing or which may be
          formed in the future,  which is confidential,  secret or otherwise not
          generally known in the industry,  and pertains  directly or indirectly
          to the business activities, products, services, customers or processes
          of  KeySpan  or any  of  its  subsidiaries  or  affiliated  companies,


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          including,  but not limited to, information  concerning mailing lists,
          publicity,   data,   research,   copyrights,   other  printed  matter,
          photographs, films, reproductions, finances, processes, trade secrets,
          business plans, customer lists and records,  potential customer lists,
          customer billing and other related information.

     9.   Executive  agrees that the  restrictions  contained  in Paragraph 8 of
          this  Agreement are  necessary  for the  protection of KeySpan and any
          breach  thereof  will  cause  KeySpan  damage  for  which  there is no
          adequate  remedy at law and  Executive  consents to the issuance of an
          injunction  in  favor of  KeySpan  and its  subsidiaries,  affiliates,
          successors   and  assigns   enjoining  the  breach  of  the  aforesaid
          restrictions by any court of competent jurisdiction.  Executive agrees
          that the  rights of KeySpan  to obtain an  injunction  granted by this
          Paragraph  of the  Agreement  shall not be  considered a waiver of the
          rights of KeySpan to assert any other remedies they may have at law or
          in equity.

     10.  This Agreement shall bind any successor of KeySpan,  its assets or its
          businesses   (whether  direct  or  indirect,   by  purchase,   merger,
          consolidation or otherwise), in the same manner and to the same extent
          that KeySpan would be obligated  under this Agreement if no succession
          had taken place.

          In the case of any  transaction in which a successor  would not by the
          foregoing provision or by operation of law be bound by this Agreement,
          KeySpan shall require such successor  expressly and unconditionally to
          assume  and  agree  to  perform   KeySpan's   obligations  under  this
          Agreement,  in the same  manner and to the same  extent  that  KeySpan
          would be required to perform if no such succession had taken place.

     11.  In the event of any litigation or other proceeding arising out of this
          Agreement after a Change of Control attributable to the subject matter
          of this  Agreement or  enforcement  of rights  asserted in good faith,
          which is initiated by the  Executive,  the  successor to KeySpan shall
          reimburse the  Executive  for all costs and expenses  relating to such
          litigation or other proceeding,  including  reasonable  attorneys fees
          and expenses,  promptly upon receipt of a written demand therefore and
          regardless  of whether such  litigation  results in any  settlement or
          judgment or order in favor of any party.

     12.  This Agreement  shall be governed by and construed in accordance  with
          the  laws of the  State  of New  York  and may be  modified  only by a
          written  instrument  executed by the parties.  This  Agreement  may be
          executed in one or more counterparts, all of which shall be considered
          one and the  same  agreement  and each of which  shall  be  deemed  an
          original.


     IN WITNESS  WHEREOF,  KeySpan has caused this Agreement to be executed by a
duly authorized officer and the Executive has executed this Agreement, all as of
the Effective Date.


                                            KEYSPAN CORPORATION



                                            By:  /s/
                                                 --------------------




                                            By:  /s/
                                                 --------------------
                                                     Anthony Sartor












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