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1.    Most power plants use steam to generate electricity. Many power plants still use fossil fuels to boil water for steam.
2.    The steam rotates a turbine which activates a generator in order to produce electricity.
3.    Geothermal power plants, however, use steam produced from reservoirs of hot water found a couple of miles or more below the Earth's surface.
4.    There are three types of geothermal power plants: dry steam, flash steam, and binary cycle.
5.    Dry steam power plants draw from underground resources of steam. The steam is piped directly from underground wells to the power plant, where it is directed into a turbine/generator unit to generate electricity.