May 15, 2015
This file photo from 2015 pictures a football-field-sized storage facility on the grounds of Palo Verde Nuclear Generating Station, where 144 20-foot tall concrete casks contain the station’s spent fuel rods. The casks require no power, but are monitored continuously. (APS/Courtesy)
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About 50 miles west of downtown Phoenix, three massive concrete domes, spaced side-by-side on a 4,000-acre plot of land, dominate the skyline.