24.1 - Power of  Attorney  executed  by Lilyan H.  Affinito  on February 6,
          2001;  which is  substantially  the same as Powers of Attorney made by
          Robert B.  Catell on  February  12,  2001;  Andrea S.  Christensen  on
          February  29, 2001;  Howard R. Curd on February  27, 2001;  Richard N.
          Daniel on February 29,  2001;  Donald H. Elliott on February 11, 2001,
          Alan H.  Fishman  January 29,  2001,  Vicki L. Fuller on February  16,
          2001;  J. Atwood Ives on January 30, 2001;  James R. Jones on February
          1, 2001;  James L. Larocca on January 30, 2001;  Craig G.  Matthews on
          March 1, 2001;  Stephen W.  McKessy on  January  31,  2001;  Edward D.
          Miller on February 8, 2001 and James Q. Riordan February 1, 2001.


                               KEYSPAN CORPORATION

                                POWER OF ATTORNEY

     WHEREAS,  KeySpan  Corporation,  a New York  corporation  (the  "Company"),
intends to file with the Securities and Exchange Commission under the Securities
Exchange Act of 1934, as amended, an Annual Report on Form 10-K as prescribed by
said Commission  pursuant to said Act and the rules and regulations  promulgated
thereunder.

     NOW, THEREFORE,  in my capacity either as a director or officer, or both as
the case may be, of the Company, I do hereby appoint GERALD LUTERMAN, RICHARD A.
RAPP,  JR.  and  MICHAEL  J.  TAUNTON,  and  each  of  them  severally,   as  my
attorneys-in-fact with power to execute in my name and place, and in my capacity
as a director,  officer,  or both,  as the case may be, of KeySpan  Corporation,
said Report,  any amendment to said Report and any other  documents  required in
connection  therewith,  and to file the same with the  Securities  and  Exchange
Commission.

     IN WITNESS WHEREOF,  I have executed this power of attorney this 6th day of
February, 2001.



                                                     /s/Lilyan H. Affinito
                                                     Lilyan H. Affinito