"Of the 2,558 MW of geothermal power plant capacity currently operating in the US, 1,826 MW of capacity is from steam-powered plants and 731 MW of capacity is from binary-cycle powered plants. But the balance is shifting, according to the US Energy Information Administration (EIA). Utility-scale geothermal power plants in the US use either steam power or a binary cycle to generate electricity. A little more than 70% of the country’s current geothermal capacity was built before the year 2000, using mostly steam-powered technology. However, of the 735 MW of capacity built since the turn of the century, nearly 90% is binary-cycle capacity."