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1 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 ---------- SCHEDULE 13D/A (RULE 13d-101) UNDER THE SECURITIES EXCHANGE ACT OF 1934 AMENDMENT NO. 6 COGENERATION CORPORATION OF AMERICA - -------------------------------------------------------------------------------- (Name of Issuer) Common Stock, par value $.01 per share - -------------------------------------------------------------------------------- (Title of Class of Securities) 628950 10 7 - -------------------------------------------------------------------------------- (CUSIP number) James J. Bender John P. Moore, Jr. Vice President and General Counsel Corporate Secretary NRG Energy, Inc. Northern States Power Company 1221 Nicollet Mall, Suite 700 414 Nicollet Mall, Fifth Floor Minneapolis, MN 55403 Minneapolis, MN 55401 (612) 373-5300 (612) 330-5500 - -------------------------------------------------------------------------------- (Name, address and telephone number of person authorized to receive notices and communications) October 1, 1998 - -------------------------------------------------------------------------------- (Date of event which requires filing of this statement) If the filing person has previously filed a statement on Schedule 13G to report the acquisition which is the subject of this Schedule 13D, and is filing this schedule because of Rule 13d-1(b)(3) or (4), check the following box / /. Note. Six copies of this statement, including all exhibits, should be filed with the Commission. See Rule 13d-1(a) for other parties to whom copies are to be sent. *The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page. The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes). (Page 1 of 4 Pages) 2 13D CUSIP NO. 628950 10 7 PAGE 2 OF 4 PAGES - -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSONS S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS NRG ENERGY, INC. I.R.S. IDENTIFICATION NO. 41-1724239 - -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [ ] - -------------------------------------------------------------------------------- 3 SEC USE ONLY - -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS* OO - -------------------------------------------------------------------------------- 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e) [ ] - -------------------------------------------------------------------------------- 6 CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE - -------------------------------------------------------------------------------- 7 SOLE VOTING POWER NUMBER OF 3,254,288 SHARES ----------------------------------------------------------------- 8 SHARED VOTING POWER BENEFICIALLY 0 OWNED BY EACH ----------------------------------------------------------------- 9 SOLE DISPOSITIVE POWER REPORTING 3,106,612 PERSON ----------------------------------------------------------------- 10 SHARED DISPOSITIVE POWER WITH 0 - -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 3,254,288 - -------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* [ ] - -------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 47.60% - -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON* CO - -------------------------------------------------------------------------------- 3 13D CUSIP NO. 628950 10 7 PAGE 3 OF 4 PAGES - -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSONS S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS NORTHERN STATES POWER COMPANY I.R.S. IDENTIFICATION NO. 41-0448030 - -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [ ] - -------------------------------------------------------------------------------- 3 SEC USE ONLY - -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS* OO - -------------------------------------------------------------------------------- 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e) [ ] - -------------------------------------------------------------------------------- 6 CITIZENSHIP OR PLACE OF ORGANIZATION MINNESOTA - -------------------------------------------------------------------------------- 7 SOLE VOTING POWER NUMBER OF 3,254,288 SHARES ----------------------------------------------------------------- 8 SHARED VOTING POWER BENEFICIALLY 0 OWNED BY EACH ----------------------------------------------------------------- 9 SOLE DISPOSITIVE POWER REPORTING 3,106,612 PERSON ----------------------------------------------------------------- 10 SHARED DISPOSITIVE POWER WITH 0 - -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 3,254,288 - -------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* [ ] - -------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 47.60% - -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON* CO - -------------------------------------------------------------------------------- 4 SIGNATURE After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. NRG ENERGY, INC. Dated: October 15, 1998 /s/ James J. Bender ------------------------------------------ Name: James J. Bender Title: Vice President and General Counsel NORTHERN STATES POWER COMPANY /s/ John P. Moore, Jr. ------------------------------------------ Name: John P. Moore, Jr. Title: Corporate Secretary