Geothermal power

Geothermal power is electricity generated by utilizing naturally occurring geological heat sources. It is a form of renewable energy.

Geothermal power is generally harnessed in one of three ways. Large scale electrical generation is possible in areas near geysers or hot springs by utilizing naturally occurring steam, superheated ground water or using geothermal heat to heat a heat-transfer fluid. Experiments are testing whether a fourth method, deep wells into "hot dry rocks" can be economically used to heat water pumped down from the surface. A hot dry rock project in the United Kingdom was abandoned after it was pronounced economically unviable in 1989.

Geothermal-generated electricity was first produced at Larderello, Italy, in 1904. Since then, the use of geothermal energy for electricity has grown worldwide to about 8,000 megawatts of which the United States produces 2700 megawatts. The largest dry steam field in the world is The Geysers, about 90 miles north of San Francisco begun in 1960 which produces 2000 MWe.

Geothermal power is generated over 20 countries around the world including Iceland (producing 17% of its electricity from geothermal sources), the United States, Italy, France, New Zealand, Mexico, the Philippines, Indonesia and Japan.

In some locations, the natural supply of water producing steam from the hot underground magma deposits has been exhausted and processed waste water is injected to replenish the supply. In at least one location, this has resulted in small but frequent earthquakes (see external link below)

See also

• Geothermal power in Iceland
• Geothermal heating
• Geothermal exchange heat pump

External links

• A real-time one week duration earthquake map that always shows a number of small earthquakes due to water injection and geothermal production - observe the upper left corner (Cloverdale) - this is the site of a geothermal plant called "The Geysers" (http://quake.wr.usgs.gov/recenteqs/FaultMaps/122-38.htm)
• Hot Dry Rock Geothermal Energy Technology (http://www.ees4.lanl.gov/hdr/)
• A University of Alaska article on geothermal energy (http://www.uaf.edu/energyin/webpage/pages/renewable_energy_tech/geothermal.htm)

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