Filed Pursuant to Rule 424(b)(3)
File Number 333-55923-99
PROSPECTUS SUPPLEMENT DATED April 1, 1999
TO
PROSPECTUS DATED JUNE 30, 1998
20,546,264 SHARES
NIAGARA MOHAWK HOLDINGS, INC.
COMMON STOCK PAR VALUE $.01 PER SHARE
----------------------
On March 18, 1999, the shares of our common stock were exchanged for
the shares of common stock of Niagara Mohawk Power Corporation ("NMPC") pursuant
to an Agreement and Plan of Exchange that we entered into on May 14, 1998. This
prospectus supplement supplements information contained in NMPC's prospectus
dated June 30, 1998, which NMPC filed as a part of a registration statement
(333-55923). We have filed a post-effective amendment pursuant to Rule 414(d)
under the Securities Act of 1933, to adopt that registration statement as our
own for all purposes of the Securities Act and the Securities Exchange Act of
1934. References to "the Company" in the Prospectus now mean Niagara Mohawk
Holdings, Inc. rather than NMPC.
INCORPORATION OF CERTAIN INFORMATION BY REFERENCE
The SEC allows us to incorporate into the prospectus information that
we have filed with it or will file in the future. This means that we can
disclose important information to you by referring you to our SEC filings.
Information that we file later with the SEC will automatically update and
supersede the information in this prospectus. As successor to NMPC, we are
incorporating into the prospectus the documents listed below and all of our
future filings made with the SEC under Sections 13(a), 13(c), 14, or 15(d) of
the Securities Exchange Act of 1934 until all of the common stock registered in
this Registration Statement has been sold:
1. The description of Niagara Mohawk Holdings, Inc. common stock contained in
Amendment No. 2 to its Registration Statement on Form S-4 dated May 29,
1998.
2. Annual Report on Form 10-K filed by NMPC for the year ended December 31,
1998.
3. Our Current Report on Form 8-K dated March 19, 1999.
You may request a copy of these filings at no cost, by writing or
telephoning:
Leon T. Mazur
Niagara Mohawk Holdings, Inc.
300 Erie Boulevard West
Syracuse, New York 13202
(315) 474-1511
