Calpine

Calpine Corporation was a Fortune 500 company based in Houston, Texas. It was the largest generator of electricity from natural gas and geothermal energy in the United States, with operations in competitive power markets. In January 2026, Constellation Energy announced it had completed its acquisition of Calpine for $16.4 billion and that Calpine would become a business unit of Constellation.

Calpine Corporation was a Fortune 500 company based in Houston, Texas. It was the largest generator of electricity from natural gas and geothermal energy in the United States, with operations in competitive power markets. In January 2026, Constellation Energy announced it had completed its acquisition of Calpine for $16.4 billion and that Calpine would become a business unit of Constellation. ==Operations== Through wholesale power operations and its retail businesses, Calpine serves customers in 24 states, Canada, and Mexico. Its fleet of 80 power plants in operation or under construction has nearly 26,035 megawatts of generation capacity. Having reported generating 100.8 million megawatt hours of electricity in 2019, the firm is the largest generator of electricity from natural gas and geothermal resources in the United States. In addition to its retail business, it is a merchant power plant operator that sells power to utilities at market rates. ===Subsidiaries=== ====Champion Energy==== Champion Energy, a subsidiary of Calpine based in Houston, Texas, is a retail electricity provider that currently serves residential, governmental, commercial and industrial customers in deregulated electric energy markets in Texas, Illinois, Ohio, Pennsylvania, New Jersey and New York. In addition, it also serves governmental, commercial and industrial customers in Delaware, Maryland and Washington, D.C.; and natural gas customers in Illinois. ===Fleet=== ====York Energy Center==== York Energy Center is a 565-megawatt natural gas-fired power plant located in Peach Bottom Township, York County, Pennsylvania. ====Metcalf Energy Center==== The Metcalf Energy Center is a 605-megawatt combined cycle power plant located in Silicon Valley, in unincorporated Coyote Valley, south of San Jose, California and north of Morgan Hill, California. The plant is powered by natural gas. Some of the power generated by the plant is sent to far away places via Path 15, a major electrical power transmission corridor that is connected to the power plant. ====The Geysers==== The Geysers is the world's largest geothermal field, containing a complex of 15 geothermal power plants, drawing steam from more than 350 wells, located in the Mayacamas Mountains approximately north of San Francisco, California. Geysers produced about 20% of California's renewable energy in 2019. Calpine owns 13 of the 15 geothermal plants at The Geysers. This group of 15 power plants is the largest producer of renewable geothermal power in North America, producing 725 megawatts of electricity, enough to power 725,000 homes or a city the size of San Francisco. Despite the name of the steam field no natural geysers exist in or near The Geysers - Clear Lake area. ====Los Medanos Energy Center==== The Los Medanos Energy Center is a 561-megawatt natural gas fired co-generation power plant located in Pittsburg, California. ====Edgemoor Power Generating Station==== Edgemoor Power Generating Station in Wilmington, Delaware was acquired via the purchase of Connectiv from PEPCO in July 2010. ====Russell City Energy Center==== The Russell City Energy Center is a 619-megawatt natural gas-fired power station, which began operating in August 2013. It is located in Hayward, California. The Russell City Energy Center is the nation’s first power plant to receive a federal air permit that includes a voluntary limit on greenhouse gas emissions. ==History== ==References==

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