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    Energy 1118975132-771.jpg file0002073981867.jpg file000438895133.jpg 94116main_usa_nightm.jpg WOODPILE.JPG axehead.JPG DSCF4826E_M.jpg DSC00562.JPG turbinegen Source: U.S. Energy Information Administration (Feb 2010) 2000px-Electricity_grid_simple-_North_America Source: U.S. Department of Energy (Feb 2010) Nonrenewable Energy Source: U.S. Department of Energy (June 2009) DOFE_coalmnrs_large.jpg file000563747928.jpg file000594319833.jpg file000331742144.jpg file000861501677.jpg file0001691310751.jpg WWEC-NGCityGate.jpg file0001289323776.jpg 22590459.jpg Nonrenewable Energy Source: U.S. Department of Energy (June 2009) file381270944050.jpg pgImg_Solar.jpg solar_Par_79604_Image_500_333_1 .jpg file0001740152865.jpg file000946188210.jpg file000663294962.jpg file0001131481740.jpg lhhydro_facility.jpg newsPage-50.jpg 94116main_usa_nightm.jpg 1118975132-771.jpg file0002073981867.jpg file000438895133.jpg file0001453464169.jpg file00026298836.jpg file0002107758889.jpg file00010789054.jpg gasoline1.jpg Geothermal-Plant.gif geothermal3_rev.jpg