
In July 2025, Constellation Energy received regulatory approval from the Federal Energy Regulatory Commission (FERC) for its previously announced US$16.4bn acquisition of Calpine Corporation, first disclosed in January 2025. The acquisition will create the
largest "low emission" power generation company
, with nearly 60 GW of capacity, including nuclear, natural gas, geothermal, hydro, wind, solar, cogeneration, and battery storage assets. Calpine currently operates 27 GW of generation capacity, while Constellation Energy Corporation has the largest nuclear fleet in the United States, operating over 32 GW of nuclear, wind, solar, gas-fired and hydropower capacity, enough to power the equivalent of 16 million homes and providing about 10% of the country’s clean energy.
























