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Geothermal power (from the Greek roots geo, meaning earth, and therm, meaning heat) is energy generated by heat stored beneath the Earth's surface, or the collection of absorbed heat derived from underground in the atmosphere and oceans. Prince Piero Ginori Conti tested the first geothermal generator on 4 July 1904, at the Larderello dry steam field in Italy.[1] The largest group of geothermal power plants in the world is located in The Geysers, a geothermal field in California.[2] As of 2007, geothermal power supplies less than 1% of the world's energy.[3]
"Geothermal" can generally refer to any heat contained in the ground. This article focuses on the generation of power from naturally occurring extraordinary sources of (relatively low grade) underground heat. Information on geothermal heat pump technology and direct exchange geothermal heat pump technology can be found in separate articles on those topics, as can that on deeper and hotter hot dry rock geothermal energy.
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