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 RONALD
S. JENDRAS, 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 7th day of March, 2002.




                         /s/Robert B. Catell
                        ----------------------------------
                        Robert B. Catell
                        Chief Executive Officer and
                        Chairman of the
                        Board of Directors