U.S. geothermal installed capacity remains concentrated in California. In 2005, California’s geothermal capacity exceeded that of every country in the world. In 2007, 4.5 % of California’s electric energy generation came from geothermal power plants, amounting to a net-total of 13,439 GWh. California currently has 2555.3 MW of installed capacity, with more under
development.