The only facility in California that does not use any of California’s precious fresh water is the Diablo Canyon Nuclear Power Plant which desalinates ocean water for all of its freshwater needs, even running the nuclear reactors. But their desalination plant is only operating at 40% capacity. They can actually produce a million and a half gallons of fresh water a day, and can ramp up quickly to provide the additional 825,000 gallons of freashwater per day to the nearby community. Because the Canyon Diablo nuclear plant produces electricity at only 4¢/kWh, the desalination will cost a fraction of a cent per gallon, cheaper than any other desalination facility.

Source: California’s Mega-Drought: Nuclear Power To The Rescue