1 SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) DECEMBER 15, 1999 ------------------------ NRG ENERGY, INC. ---------------- (Exact name of registrant as specified in its charter) DELAWARE -------- (State or other jurisdiction of incorporation) 333-33397 41-1724239 ---------------------- -------------------------------- (Commission File Number) (IRS Employer Identification No.) 1221 NICOLLET MALL, SUITE 700 MINNEAPOLIS, MN 55403 ------------------------------------------------------------------------------- (Address of principal executive offices) (Zip Code) Registrant's telephone number, including area code 612-373-5300 ------------ (Former name or former address, if changed since last report)

2 ITEM 5. OTHER EVENTS On December 15, 1999, NRG Energy, Inc (NRG), a wholly-owned subsidiary of Northern States Power Company, acquired the Middletown, Montville, Norwalk and Devon generating stations totaling 2,235 Megawatts (MW) of generating capacity from Connecticut Light & Power Company of Hartford, Connecticut. The total purchase price of $460 million, plus adjustments for working capital, was funded by short-term corporate borrowings and equity from Northern States Power. The short-term financing is expected to be replaced by long-term non-recourse financing in the first quarter of 2000. Other details are contained in the news release attached as Exhibit 99.7. ITEM 7. FINANCIAL STATEMENTS AND EXHIBITS. (c) Exhibits Exhibit No 99.7 - December 15, 1999 News Release from NRG titled "NRG Energy Completes Acquisition of Connecticut Generating Assets." SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. NRG Energy, Inc (Registrant) By /s/ Leonard A. Bluhm ----------------------------------------------- Leonard A. Bluhm Executive Vice President and Chief Financial Officer (Principal Financial Officer) Dated: December 28, 1999 ------------------

1 EXHIBIT 99.7 NRG ENERGY, INC. FOR IMMEDIATE RELEASE: DECEMBER 15, 1999 NRG ENERGY COMPLETES ACQUISITION OF CONNECTICUT GENERATING ASSETS MINNEAPOLIS (December 15, 1999) NRG Energy, Inc., (NRG Energy) a wholly owned, nonregulated subsidiary of Northern States Power Company (NYSE:NSP), today announced the completion of the acquisition of electric steam generating stations and remote gas turbines totaling 2,235 megawatts (MW) of generating capacity from Connecticut Light & Power Company (CL&P) of Hartford, Conn. A subsidiary of NRG Energy will operate the stations. The principal assets are the Middletown, Montville, Devon and Norwalk Harbor gas- and oil-fired steam generating stations. NRG Energy, among the three largest independent power producers in the region, now owns more than 7,000 MW of generating capacity in the northeast United States. In November, NRG Energy also announced that its power-marketing unit, NRG Power Marketing Inc., had been awarded a four-year contract to supply approximately 40 percent of the CL&P Standard Offer power requirements. Standard Offer Service is the electric generation service provided to generation service customers of CL&P's distribution company. "NRG Energy's newly acquired generating stations in Connecticut will continue to serve the state's electricity customers through our participation in the CL&P Standard Offer supply contract," said Craig Mataczynski, president and chief executive officer of NRG North America. "We are delighted to begin operations today and look forward to becoming active members of the communities we serve." Mataczynski said NRG North America would continue to refine options identified in its business plan to enhance the operating and environmental performance of the Connecticut plants. "NRG Energy is committed to environmentally responsible power generation," Mataczynski said. "We have a history of improving operating efficiency and environmental performance at facilities we acquire, and our actions related to the Connecticut units will be consistent with that approach." Middletown Station, an 856-MW steam-powered plant, is located beside the Connecticut River in Middletown, Conn. The 498-MW Montville Station is located on the Thames River in Uncasville, Conn. Norwalk Harbor Station, with 353 MW of capacity, is located on Manresa Island at the mouth of Norwalk Harbor. Devon Station, consisting of 401 MW of generation capacity, is located on the Housatonic River at Milford, Conn. NRG Energy is the world's seventh largest independent power producer, specializing in the development, construction, operation, maintenance and ownership of low-cost, environmentally responsible power plants and associated power-marketing activities. With leading generation positions in selected markets in

2 the United States, Europe, the Pacific Rim, and Latin America, NRG Energy is involved in projects representing more than 22,000 MW of generating capacity, including nearly 11,000 MW of fully owned capacity. NRG Energy's operations utilize such diverse fuel sources as natural gas, oil, coal and coal seam methane, biomass, landfill gas, and hydro, as well as refuse derived fuel and geothermal energy. Certain information included in this press release contains statements that are forward-looking. Such forward-looking information involves risks and uncertainties that could significantly affect anticipated results in the future and, accordingly, such results may differ from those expressed in any forward-looking statements made by or on behalf of NRG Energy. For more information regarding these risks and uncertainties, review NRG Energy's filings with the Securities and Exchange Commission. # # # MEDIA CONTACT: Frank Rapley NRG Energy, Inc. (612) 373-8892 e-mail: frank.rapley@nrgenergy.com (C)1999 NRG Energy, Inc., All Rights Reserved