Geothermal Power Project of Pacific Gas and Electric Company at the Geysers, California

Utilization of the earth's geothermal energy resources for production of electric power has been achieved in several areas throughout the world. The only commercial development in operation in North America is at "The Geysers" north of San Francisco. A 12 MW unit commenced operation in 1960, and additional units have been added bringing the total capacity to 192 MW. Design and construction now under way will increase this to 522 MW by the end of 1974. There are plans for continuing increments of approximately 100 MW per year as steam reserves are developed. The steam supply, mechanical and electrical features, operating experience, and special problems are described.