U.S. Department of Energy (DOE), Energy Information Administration (EIA), Crude Oil Production, electronic database, at tonto.eia.doe.gov, updated 28 July 2008; American Wind Energy Association (AWEA), «Installed U.S. Wind Power Capacity Surged 45 % in 2007: American Wind Energy Association Market Report,» press release (Washington, DC: 17 January 2008); AWEA, U.S. Wind Energy Projects, electronic database, at www.awea.org/projects, updated 31 March 2009; future capacity calculated from Emerging Energy Research (
EER), «US Wind Markets Surge to New Heights,» press release (Cambridge, MA: 14 August 2008); coal - fired power plant equivalents calculated by assuming that an average plant has a 500 - megawatt capacity and operates 72 percent of the time, generating 3.15 billion kilowatt - hours of electricity per year; residential consumption calculated using «Residential Sector Energy Consumption Estimates, 2005,» in DOE, EIA, Residential Energy Consumption Survey 2005 Status Report (Washington, DC: 2007), with capacity factor from DOE,
National Renewable Energy Laboratory (NREL), Power Technologies Energy Data Book (Golden, CO: August 2006); population from U.S. Census Bureau, State & County QuickFacts, electronic database, at quickfacts.census.gov, updated 20 February 2009.