GenOn Energy Holdings,[1] formerly Mirant Corporation, was a subsidiary of GenOn Energy, and is now a part of NRG Energy.
The company was spun off from its former parent, Southern Company, on April 2, 2001.[2] The company was merged into GenOn Energy on 3 December 2010.[3] The company then became part of NRG Energy in December 2012.[4]
Mirant operated 13 plants in the states of California, Georgia, Maine, Maryland, Massachusetts, Michigan, New York, and Virginia and has the capacity to generate approximately 10,300 MW of electricity.