January 13, 2025--Researched by Industrial Info Resources (Sugar Land, Texas)--Constellation Energy Corporation (NYSE:CEG) (Baltimore, Maryland) announced one of the largest U.S. power deals ever on Friday when it detailed plans to purchase Calpine Corporation (Houston, Texas). Constellation is the largest nuclear power company in the U.S., while Calpine's holdings include natural gas-fired and geothermal facilities.