Constellation Closes on Buying Calpine, Now U.S.’s Largest Power Co.

Constellation Energy Corporation has finalized its acquisition of Calpine Corporation from Energy Capital Partners, becoming the largest electricity producer in the United States, with a generating capacity of 55 gigawatts. This merger integrates Constellation’s zero-emission nuclear fleet with Calpine’s natural gas and geothermal assets. Prior to the merger, Calpine owned 79 energy facilities across the country, generating some 27 gigawatts (GW) of electricity, with a significant number located in the eastern U.S. Many of Calpine’s facilities use natural gas to produce electricity.

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