PRINCETON, N.J.--(BUSINESS WIRE)--March 29, 2006--NRG Energy, Inc. (NYSE:NRG) has completed the sale of the Audrain Generating Station, a gas-fired peaking facility in Vandalia, Missouri, to AmerenUE, a subsidiary of Ameren Corporation (NYSE:AEE). The purchase price was $115 million, subject to customary purchase price adjustments, plus Ameren's assumption of $240 million of non-recourse capital lease obligations and assignment of a $240 million note receivable. Of the $115 million in cash proceeds, approximately $20 million was paid to NRG.

Overall, the sale process removed approximately $412 million of assets and liabilities. Of this amount, $355 million remained on our balance sheet as of December 31, 2005, categorized as discontinued operations.

NRG Energy, Inc. owns and operates a diverse portfolio of power-generating facilities, primarily in Texas, and the Northeast, South Central and Western regions of the United States. Its operations include baseload, intermediate, peaking, and cogeneration facilities, thermal energy production and energy resource recovery facilities. NRG also has ownership interests in generating facilities in Australia and Germany.

AmerenUE is a subsidiary of St. Louis-based Ameren Corporation. The utility corporations of Ameren serve 2.3 million electric and more than 900,000 natural gas customers in a 64,000-square-mile area of Illinois and Missouri.

Certain statements included in this news release are forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. Forward-looking statements above include, but are not limited to the expected timing of the transaction, expected pre-tax gains and its impact on NRG's balance sheet. Although NRG believes that its expectations are reasonable, it can give no assurance that these expectations will prove to have been correct. Factors that could cause NRG's actual results to differ materially from those contemplated in the forward-looking statements above include, among others, final decisions regarding the accounting treatment of the transaction.

NRG undertakes no obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise. The foregoing review of factors that could cause NRG's actual results to differ materially from those contemplated in the forward-looking statements included in this news release should not be construed as exhaustive. For more information regarding risks and uncertainties that may affect NRG's future results, review NRG's filings with the Securities and Exchange Commission at www.sec.gov.

    CONTACT: NRG Energy, Inc.
             Investor Relations:
             Nahla Azmy, 609-524-4526
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             Media Relations:
             Meredith Moore, 609-524-4522

    SOURCE: NRG Energy, Inc.