The k p method and its application to graphene, carbon nanotubes and graphene nanoribbons: the Dirac equation

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Indeed, “natural gas construction costs account for only one third of the total price of the facility, while the cost of the fuel at a natural gas facility represents two thirds of the cost” (Geothermal 101). The U.S. Department of energy provides an extremely low esti- mate for a plant built with today‟s technology: about 5 cents per kWh (US DOE Geothermal). Another estimate puts the price far lower: 3.6 cents per kWh, compared to 5.5 for coal and 5.2 for natural gas (Mims). This particular study, however factors in the savings due to tax incentives, about 1.9 cents for geothermal energy (Ibid). Technology and experience continue to bring down costs. Indeed, since 1980 costs have fallen faster than coal, while the cost of natural gas has increased (Geothermal). Along with wind, geothermal is one of the few alternative energies that can compete with fossil fuels without subsidies, and geothermal is more dependable than wind. One factor unique to geothermal is the potential to partner with conventional fossil fuels, specifi- cally the oil industry, known as co-production. Drilling for oil wells often results in striking pockets of hot water, traditionally a nuisance for the oil industry (Dorreen). With geothermal technology, this heat can be put to good use. Currently, the U.S. Department of Energy has “two geothermal co-production demonstrations . . . at the Rocky Mountain Oil Test Center in Wyo- ming and the Jay oil field in Florida” (Geothermal 101). U.S. Picture The United States is, and has long been, the foremost producer of geothermal electricity, gener- ating “approximately 30 percent of the world total” 14,885 gigawatt-hours (GWh) in 2007, enough to power about 2.4 million California households (Geothermal 101). Geothermal energy accounts for some 4% of U.S. renewable electricity, still a small number. The U.S. Department of Energy places geothermal energy “third among renewables, following hydroelectricity and biomass, and ahead of solar and wind” (Blair). Future potential is great, however; a 2006 National Renewable Energy Laboratory (NREL) report estimates “that by 2025 more than 100,000 MW of geothermal power could be in production, with direct use and heat pumps add- ing another 70,000 MW of thermal energy” (Geothermal 101). For electrical generation, this power is mostly available in Western states. In March 2008, geothermal electric power genera- tion was limited to eight states: Alaska, California, Hawaii, Idaho, Nevada, New Mexico, Utah and Wyoming (Slack). ProQuest Discovery Guides http://www.csa.com/discoveryguides/discoveryguides-main.php 7 Goffman: Geothermal Energy The Earth's heat—called geothermal energy— escapes as steam at a hot springs in Nevada. http://www.nrel.gov/learning/re_geothermal.h tml Released September 2009

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