The Geysers Geothermal Complex located 121km north of San Francisco, California, is comprised of 15 power plants making it the biggest geothermal installation in the world. The complex has an installed capacity of 1,205MW.

Calpine owns 13 power plants in the complex, which have a combined net generating capacity of 725MW, while two power plants with a capacity of 240MW each are jointly owned by Northern California Power Agency and Silicon Valley Power, as well as US Renewables Group, which owns the Bottle Rock Power plant.


The complex covers an area of 78km². Production from the geothermal field commenced in 1960 and reached its peak in the 1980s. The turbine suppliers for the power plants in the complex were Toshiba and Mitsubishi Steam. 

According to