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Geothermal Energy
From TipThePlanet
Geothermal energy is produced by the heat of the earth and is often associated with volcanic and seismically actve regions. California has 25 known geothermal resource areas, 14 of which have underground water temperatures of 300 degrees Fahrenheit (149 degrees Celsius) or greater.
Hot water and, in some instances, steam can be used to make electricity in large power plants. Hot water can also be put to direct plants. Hot water can also be put to direct use, such as heating greenhouses or other buildings. The constant temperature below ground can also be tapped to warm and cool your home through a ground - source heat pump.
