Geothermal power is energy generated by heat stored beneath the Earth's surface. As of 2007,
geothermal power supplies less than 10% of the world's energy. Geothermal comes from the
Greek words geo, meaning earth, and therme, meaning heat. Prince Piero Ginori Conti tested the first geothermal power plant on 4 July 1904, at the
Larderello dry steam field in Italy. The largest group of geothermal power plants in the world is located in
The Geysers, a geothermal field in California.
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Heat transferred from the earth's molten core to under-ground deposits of dry steam (steam with no water droplets), wet steam (a mixture of steam and water droplets), hot water, or rocks lying fairly close to the earth's surface.