By Atlanta Business Chronicle

The U.S. Department of Justice has asked for more information about Mirant Corp.â¿¿s pending merger with RRI Energy Inc.

Atlanta-based Mirant (NYSE: MIR) said this second request is a common part of the regulatory approval process under the Hart-Scott-Rodino Antitrust Improvements Act.

In April, the companies reported plans to combine to form GenOn Energy in a $1.6 billion stock swap. The merger will create an energy company with 24,700 megawatts of generating capacity in markets across the United States. GenOnâ¿¿s revenue projection is $4.13 billion.

Mirant and Houston-based RRI Energy (NYSE: RRI) are now gathering information to respond to the DOJâ¿¿s second request. Both companies expect the merger to close before the end of 2010.

Mirant was born in Atlanta out of a spin-off from Southern Co. (NYSE: SO) in 2001. During its nine-year run, it weathered SEC investigations, restated earnings and a bankruptcy.

Mirantâ¿¿s profit fell 62 percent to $494 million in 2009.

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Copyright 2010