In Yosemite National Park, 143 miles from San Francisco, the waters of the Tuolumne River are dammed in the big blue lake called Hetch Hetchy. Without Hetch Hetchy, San Franciscans would sometimes have gone waterless; so would many a farm in the valley between, a land rainless four months or more a year. Fifteen years ago San Franciscans put their famous reservoir to another use. At Mocassin Creek near the valley floor they built turbines, harnessed nearly 100,000 horsepower of electricity. City-owned transmission lines carry the power to Newark near San Francisco Bay. There, 27 miles from Nob Hill,...
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