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   |  Geothermal Energy: A Natural Source of Clean Power Geothermal Brochure - click here to download in pdf format  (4.1Mb)World Geothermal Power Generation 2001 - 2005 By Ruggero Betani - Enel, Generation and Energy Management - Renewable Energy - Geothermal Production This is a article that was published by special permission in the Geothermal Resource Council Bulletin May/June 2006 issue, Vol. 35, No. 3. This is a review of all the country update papers submitted to the World Geothermal Congress (WGC 2005) from countries in which geothermal electricity is currently being generated. To read more click here to download in pdf format (1.13Mb)Geothermal energy (literally heat from the earth) has become the "green" energy alternative of choice because it is natural, clean, renewable, reliable, efficient and inexpensive to operate. The western U.S.A. has a generous endowment of geothermal potential. Nevada occupies the area of highest crustal heat flow in North America, thanks to increased magmatic activity related to plate tectonics. Today, Nevada is one of the top producers of geothermal power, with 277 MW installed capacity. Geothermal energy provides about 9% of northern Nevada's electricity with 14 power plants operating at 12 geothermal sites. Nevada holds the largest amount of untapped geothermal resources in the US with a potential for 2,500 to 3,700 MW of electricity.  Geothermal heat can be harnessed for clean electrical power generation wherever there is high heat flow in deep, fractured rock formations and a shallower, non-fractured or sealed caprock.  Ground water in the deep fractures becomes heated and rises to form a geothermal reservoir under the cap rock. Production wells are typically drilled one to two km deep to bring the hot water (at least 150°C) up to surface where it flashes to steam. The steam is then used to drive turbines for generating electricity and the residual water is pumped back down injection wells to recharge the reservoir. http://www1.eere.energy.gov/geothermal/overview.html http://www.eere.energy.gov/geothermal/faqs.html http://www.energy.gov/energysources/geothermal.htm http://geoheat.oit.edu http://iga.igg.cnr.it/index.php http://geoheat.oit.edu/dusys.htm http://www.energy.ca.gov/geothermal http://www.geo-energy.org/ http://www.geothermal.org http://www.eere.energy.gov/geothermal/ http://www.geothermal.marin.org http://www.egi.utah.edu http://www.eia.doe.gov/cneaf/solar.renewables/page/geothermal/ geothermal.html | |
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