Dry is a lot more than just not wet

Western drought steals clean energy along with fresh water at power plants - The Washington Post

"Power capacity at Hoover Dam, on the Arizona-Nevada border, has dropped nearly 25 percent since 2000. In California, home to 287 hydroelectric plants and where almost half the state today is classified as being in ‘exceptional drought,’ hydropower has fallen 60 percent in the past four years."