America’s Premier Competitive Power Company
... Creating Power for a Sustainable Future
Sonoma is one of Calpine’s geothermal power plants operating at The Geysers in Northern California. Its operations comprise a geothermal power plant and associated steam fields. Calpine’s plants at The Geysers make it North America’s largest producer of clean, reliable renewable geothermal power. Together, these plants have the capacity to produce 725 megawatts of electricity around the clock.