Solar, wind and geothermal power are now mainstream sources of electricity generation in 23 states, according to data from the U.S. Energy Information Agency (EIA). Solar is already the second leading source of power in California, and in Nevada that will likely be the case by 2017. As recently as 2006, fossil fuels accounted for 71% of electric power generation in the U.S. By 2015, that number had dropped to 66.8%. Since 2006, solar energy’s share of the overall energy mix has grown more than 5,000%.
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