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Guide to Geothermal Energy and the Environment Geothermal plants

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Guide to Geothermal Energy and the Environment Geothermal plants ( guide-geothermal-energy-and-environment-geothermal-plants )

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Water Quality: Geothermal fluids used for electricity are injected back into geothermal reservoirs using wells with thick casing to prevent cross-contamination of brines with groundwater systems. They are not released into surface waterways. At The Geysers facility, 11 million gallons of treated wastewater from Santa Rosa are pumped daily for injection into the geothermal reservoir. Injection reduces surface water pollution and increases geothermal reservoir resilience. Land Use: Geothermal power plants can be designed to ìblend-inî to their surrounding more so than fossil fired plants, and can be located on multiple-use lands that incorporate farming, skiing, and hunting. Over 30 years, the period of time commonly used to compare the life cycle impacts from different power sources, a geothermal facility uses 404 square meters of land per gigawatt hour, while a coal facility uses 3632 square meters per gigawatt hour. --Subsidence: Subsidence, or the slow, downward sinking of land, may be linked to geothermal reservoir pressure decline. Injection technology, employed at all geothermal sites in the United States, is an effective mitigating technique. --Induced Seismicity: While earthquake activity, or seismicity, is a natural phenomenon, geothermal production and injection operations have at times resulted in low-magnitude events known as ìmicroearthquakes.î These events typically cannot be detected by humans, and are often monitored voluntarily by geothermal companies. Geysers, Fumaroles, and Geothermal Resources: While almost all geothermal resources currently developed for electricity production are located in the vicinity of natural geothermal surface features, much of the undeveloped geothermal resource base may be found deep under the Earth without any corresponding surface thermal manifestations. Geothermal surface features, while useful in identifying resource locations, are not used during geothermal development. U.S. laws and regulations protect and preserve national parks and their significant thermal features. Impact on Wildlife and Vegetation: Before geothermal construction can begin, an environmental review may be required to categorize potential effects upon plants and animals. Power plants are designed to minimize the potential effect upon wildlife and vegetation, and they are constructed in accordance with a host of state and federal regulations that protect areas set for development. iii

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