Exhibit 23-a   CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

     We consent to the incorporation by reference in this Registration Statement
of KeySpan  Corporation  on Form S-3 of our reports  dated  February  28,  2005,
relating to the financial statements and financial statement schedule of KeySpan
Corporation  (which  report  expresses  an  unqualified   opinion  and  includes
explanatory  paragraphs  related  to the  adoption  of  Statement  of  Financial
Accounting  Standards (SFAS) No.142,  "Goodwill and Other Intangible  Assets" as
discussed  in  Note  1(G),  the  adoption  of  SFAS  No.  148,  "Accounting  for
Stock-Based  Compensation-Transition  and Disclosure" as discussed in Note 1(N),
the adoption of SFAS No. 143  "Accounting for Asset  Retirement  Obligations" as
discussed in Note 1(P) and the adoption of Financial  Accounting Standards Board
Interpretation  No.  46,   "Consolidation  of  Variable  Interest  Entities,  an
Interpretation of ARB No. 51" as discussed in Note 1(P)) and management's report
on the effectiveness of internal control over financial  reporting  appearing in
the  Annual  Report  on Form  10-K of  KeySpan  Corporation  for the year  ended
December 31, 2004 and to the reference to us under the heading  "Experts" in the
Prospectus, which is part of this Registration Statement.

/s/ Deloitte & Touche LLP
Deloitte & Touche LLP
New York, New York
January 31, 2006