ATLANTA and HOUSTON, July 16 /PRNewswire-FirstCall/ -- Mirant Corporation (NYSE: MIR) and RRI Energy (NYSE: RRI) today announced that yesterday they each received a request for additional information from the United States Department of Justice (DOJ) regarding their proposed merger. This action, often referred to as a second request, is a common part of the regulatory approval process under the Hart-Scott-Rodino Antitrust Improvements Act. On April 11, 2010, Mirant and RRI Energy announced their intention to merge and create GenOn Energy, which will be one of the largest independent power producers in the United States, with approximately 24,700 megawatts (MW) of electric generating capacity. Mirant and RRI Energy are in the process of gathering information to respond to the second request and are working cooperatively with the DOJ as it reviews the merger. Both companies expect the merger to close before the end of 2010. About Mirant Corporation Mirant is a competitive energy company that produces and sells electricity in the United States. Mirant owns or leases more than 10,000 megawatts of electric generating capacity. The company operates an asset management and energy marketing organization from its headquarters in Atlanta, Ga. For more information, please visit www.mirant.com. About RRI Energy, Inc. RRI Energy, Inc., based in Houston, provides electricity to wholesale customers in the United States. The company is one of the largest independent power producers in the nation with more than 14,000 megawatts of power generation capacity across the United States. These strategically located generating assets use natural gas, fuel oil and coal. RRI routinely posts all important information on its website at www.rrienergy.com. Forward Looking Statements This communication contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements are typically identified by words or phrases such as "will," "anticipate," "estimate," "expect," "project," "intend," "plan," "believe," "target," "forecast," and other words and terms of similar meaning. These forward-looking statements involve a number of risks and uncertainties. RRI Energy and Mirant caution readers that any forward-looking statement is not a guarantee of future performance and that actual results could differ materially from those contained in the forward-looking statement. Such forward-looking statements include, but are not limited to, statements about the benefits of the proposed merger involving RRI Energy and Mirant, including future financial and operating results, RRI Energy's and Mirant's plans, objectives, expectations and intentions, the expected timing of completion of the transaction, and other statements that are not historical facts. Important factors that could cause actual results to differ materially from those indicated by such forward-looking statements are set forth in RRI Energy's and Mirant's filings with the Securities and Exchange Commission (SEC). These include risks and uncertainties relating to: the ability to obtain the requisite RRI Energy and Mirant shareholder approvals; the ability to obtain the requisite financing; the risk that Mirant or RRI Energy may be unable to obtain governmental and regulatory approvals required for the merger, or required governmental and regulatory approvals may delay the merger or result in the imposition of conditions that could cause the parties to abandon the merger; the risk that a condition to closing of the merger may not be satisfied; the ability to resolve any litigation related to the merger; the timing to consummate the proposed merger; the risk that the businesses will not be integrated successfully; the risk that the cost savings and any other synergies from the transaction may not be fully realized or may take longer to realize than expected; disruption from the transaction making it more difficult to maintain relationships with customers, employees or suppliers; the diversion of management time on merger-related issues; general worldwide economic conditions and related uncertainties; and the effect of changes in governmental regulations; and other factors discussed or referred to in the "Risk Factors" section of each of RRI Energy's and Mirant's most recent Annual Report on Form 10-K and Quarterly Report on Form 10-Q filed with the SEC. Each forward-looking statement speaks only as of the date of the particular statement and neither RRI Energy nor Mirant undertake any obligation to publicly update any forward-looking statement, whether as a result of new information, future events or otherwise.