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Renewable Energy Source: GEOTHERMAL

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Renewable Energy Source: GEOTHERMAL ( renewable-energy-source-geothermal )

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GEOTHERMAL CHAPTER 3 HOT ENERGY FOR A COLD COUNTRY Iceland is such an active geothermal area that hot springs occasionally bubble up right into people’s living rooms! People in this cool-weather country make really good use of their abundant geothermal energy resource. They use it for everything from heating homes, offices, and greenhouses to warming swimming pools and generating electricity. In the middle of winter, it is not uncommon to see people soaking in the steamy hot pool found right outside a geothermal power plant. CONSIDERATIONS ■ Geothermal power plants have no smoky emissions. What comes out the top of a geothermal plant cooling tower is steam (water vapor) with only trace amounts of natural minerals and gases from the geothermal reservoir. Flash and dry steam plants produce only a small fraction of air emissions compared to fossil fuel plants. Binary power plants have virtually no emissions. ■ Geothermal power plants use very little land compared to conventional energy resources and can share the land with wildlife or grazing herds of cattle. They operate successfully and safely in sensitive habitats, in the midst of crops, and in forested recreation areas. However, they must be built at the site of the geothermal reservoir, so there is not much flexibility in choosing a plant location. Some locales may also have competing recreational or other uses. ■ Geothermal wells are sealed with steel casing, cemented to the sides of the well along their length. The casing protects shallow, cold groundwater aquifers from mixing with geothermal reservoir waters. This way the cold groundwater doesn’t get into the hot geothermal reservoir and the geothermal water doesn’t mix with potential sources of drinking water. (continued) Some spas in Iceland are located right next to geothermal power plants. © 2007 The California Study, Inc. ENERGY FOR KEEPS: ELECTRICITY FROM RENEWABLE ENERGY 37

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