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- W206597683 abstract "A gradual withdrawal of geothermal energy will extend its use and allow future utilization of this resource as more advanced earth-heat extraction concepts are developed. Unless this is done, geothermal energy will supply only a small fraction of our energy needs and for a relatively short time. A number of countries are already tapping geothermal fields, but the U.S., with two million known acres of geothermal fields, is the largest producer. Leasing of geothermal fields began in 1970 with the Geothermal Steam Act and directions to ERDA to develop a national goal and program for fiscal-year 1977. Wells are drilled 4000 to 10,000 feet deep to tap either steam to turn turbines or hot water to boil a secondary substance. Total known and anticipated resources are estimated to be able to produce 153,000 megawatts for 30 years. Site locations are important because geothermal energy cannot be transported. Other possibilities for earth heat energy are zones of superheated, pressurized fluids found in the Gulf Coast area and areas of dry hot rock close to the earth's surface in New Mexico. Environmental difficulties arise because the best locations for geothermal sources are also those valued and protected by environmentalists for their scenicmore » and cultural quality and their proximity to areas of volcanic activity. The noise and equipment necessary for drilling operations create a heavy industrial atmosphere which is incompatible with scenic lands. An estimated 20 percent of land surface in a developed field is altered by erosion and siltation. Air and vegetation are polluted by large emissions of hydrogen sulfite gas; water by drilling muds, brines, and steam condensates. (6 references) (DCK)« less" @default.
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- W206597683 title "Geothermal energy: prospects and limitations" @default.
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