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Geothermal energy has been exploited as a source of heat and/or electric power for millennia. Geothermal heating, using water from hot springs, for example, has been used for bathing since Paleolithic times and for space heating since Roman times. Geothermal power (generation of electricity from geothermal energy), has been used since the 20th ...
Geothermal power is considered to be sustainable because the heat extraction is small compared to the Earth's heat content, but extraction must still be monitored to avoid local depletion. [7] Although geothermal sites are capable of providing heat for many decades, individual wells may cool down or run out of water.
Geothermal activity is a group of natural heat transfer processes, occurring on Earth's surface, caused by the presence of excess heat in the subsurface of the affected area, usually caused by the presence of an igneous intrusion underground. [1]
The Sonoma Calpine 3 geothermal power station of The Geysers. Geothermal energy in the United States was first used for electric power production in 1960. The Geysers in Sonoma and Lake counties, California was developed into what is now the largest geothermal steam electrical plant in the world, at 1,517 megawatts. Other geothermal steam ...
Although often confused with the relatively limited hydrothermal resource already commercialized to a large extent, HDR geothermal energy is very different. [3] Whereas hydrothermal energy production can exploit hot fluids already in place in Earth's crust, an HDR system (consisting of the pressurized HDR reservoir, the boreholes drilled from the surface, and the surface injection pumps and ...
Geothermal energy has been employed by Icelanders since the Viking Age, with initial uses including washing and bathing. [2] Later, it began to be used to heat homes, greenhouses, and swimming pools, as well as to keep streets and sidewalks free of snow and ice. [2] Today, at least 90% of all homes in Iceland are heated with geothermal energy. [2]
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