As the first decade of the twenty-first century crested, making power from renewable sources shifted from a nice idea and a minor player on the electricity scene into the mainstream. The speed and the scale of this shift have been truly extraordinary—a momentum that is only likely to increase. It is estimated that by 2050 “nearly every single power plant in the U.S. will need to be replaced by new plants.” If, then, in 2015 we had three times as much wind power as in 2008 and twenty times as much solar, these looming plant retirements only further open the door to renewable technologies, big
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