As of 2010, the United States tops the world in geothermal energy production, with 3,100 MW of installed capacity. 77 geothermal power plants and growing generate 15 billion kilowatt hours of electricity per year. The majority of the United States’ geothermal energy comes from the western states, and if tapped to their full capacity, geothermal reserves beneath just nine of the United States’ 50 states could provide upward of 20 percent of the nation’s electricity needs. The largest known dry steam field in the world is just north of San Francisco, California. “The Geysers” geothermal hotspot has over 1,500 MW of installed capacity. Calpine Corporation currently taps 15 of the 18 power plants operating in the Geysers, making it the largest geothermal energy producer in the United States. Northern California Power Agency, Santa Clara Municipal Electric Utility and US Renewables Group own and operate the remaining three facilities in the Geysers and a nineteenth plant is soon to be opened by Ram Power.