Exhibit 23.3

            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 report dated February 18, 2004 (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) and Note 7, 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(O), and to the application of procedures relating to
certain disclosures and reclassifications of financial statement amounts related
to the 2001 consolidated financial statements that were audited by other
auditors who have ceased operations and for which we have expressed no opinion
or other form of assurance other than with respect to such disclosures and
reclassifications) appearing in the Annual Report on Form 10-K of KeySpan
Corporation for the year ended December 31, 2003, and to the reference to us
under the heading "Experts" in the Prospectus, which is a part of this
Registration Statement.

/s/ Deloitte & Touche LLP

Deloitte & Touche LLP
New York, New York
September 30, 2004