This year, billions of gallons of water are once again spinning turbines in power plants at huge dams like Shasta, Oroville and Folsom, and will be all summer and into the fall as the snowpack melts. But by 2021, in the middle of California’s most recent drought, it provided just 7%. In 2017, a wet year similar to this one, hydropower made up 21% of all the electricity generated in California. With reservoirs full across the state, hydroelectricity generation from dams is expected to expand dramatically this summer, after three dry years when it was badly hobbled. ![]() It’s also changing how Californians keep the lights on. ![]() ![]() The huge snowpack that has blanketed the Sierra Nevada this winter has done more than end California’s drought and extend ski season.
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