There are three main types of geothermal power plants. Dry steam plants pipe hot steam directly from geothermal reservoirs into generators at the plants. The steam powers a turbine, which generates the electricity.
Flash steam power plants use underground water brought up through a well. Steam from the water powers the turbines. As the steam condenses, it returns to the ground as water.
Binary cycle plants take semi-warm geothermal water through a heat exchanger. The heat from the water transfers to a liquid in the plant, usually one that boils at a lower temperature than water. The steam from this secondary fluid powers the turbines.
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