By Houston Business Journal

RRI Energy Inc., formerly Reliant, and Mirant Corp. said they have received a request for additional information from the United States Department of Justice regarding their proposed merger.

Houston-based RRI Energy (NYSE: RRI) and Atlantaâ¿¿s Mirant (NYSE: MIR) first announced their plans to combine operations on April 11.

The companies say they are in the process of gathering information to respond to DOJâ¿¿s request. They still expect the merger to close by yearâ¿¿s end.

Upon closing of the all-stock, tax-free $1.6 billion deal, the combined company â¿¿ dubbed GenOn Energy - will be one of the largest independent power producers in the United States, with about 24,700 megawatts of electric generating capacity.

In late May, several environmental groups announced their intent to sue RRI Energy for allegedly violating environmental laws more than 12,000 times in the past five years.

The company runs the Seward Generating Station near Pittsburgh, a waste coal burning power plant that underwent an $800 million renovation in 2004, and is the subject of upcoming litigation.

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Copyright 2010