Hetch Hetchy Reservoir and O’Shaughnessy Dam in Yosemite National Park provide nearly 20 percent of San Francisco’s energy supply. As California enters its third year of drought and reservoir levels dwindle, The City’s energy is under threat.
Hetch Hetchy Reservoir and O’Shaughnessy Dam in Yosemite National Park, which provides nearly 20 percent of San Francisco’s energy supply. As California enters its third year of drought and reservoir levels dwindle, The City’s energy is under threat. Nearly 20 percent of The City’s energy is generated by water stored at Cherry Lake and Hetch Hetchy Reservoir, a glacial valley in the northwestern corner of Yosemite National Park – the same water that spills from our taps.
“The less it snows, the less water there is behind hydroelectric dams, and the less ‘fuel’ there is for producing hydropower,” said Jordan Kern, a forestry and environmental resources professor at North Carolina State University. Touted as a low-cost and reliable energy source, the SFPUC’s Hetchy Power Program consists of nine reservoirs and three power stations along the Tuolumne River watershed that store and process water destined for the Bay Area.
California accounts for 13% of the country’s hydropower capacity, but as the state experiences more intense drought, wildfires, and a shrinking Sierra snowpack, mountain streams like the Tuolumne River are ebbing, reducing the force of water pressure needed to turn the turbines. But it’s not all bad news. As Northern California entered this water year, a smattering of intense October rainstorms and heavy snowpack has helped restore some of the capacity.
While Hetch Hetchy is faring better than other reservoirs in the state, if hydroelectric power capacity continues to decline, San Francisco’s reliance on fossil fuels is poised to increase – along with the cost of energy — at least in the short term.
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