Geothermal

Calpine Corporation
Calpine operates 15 geothermal power plants at The Geysers region of Northern California, generating up to 725 megawatts of renewable "green" power or nearly 40 percent of the geothermal energy in the United States, making Calpine the largest producer of geothermal energy in North America. Presently, this electric-generating technology is practical in only a few parts of the world, but innovative technologies, many of which Calpine has pioneered, such as reclaimed water recharge projects, are expanding and extending this valuable natural resource.