Enlarge / The Palo Verde Nuclear generating plant, the nation's largest nuclear power plant. (credit: Jeff Topping / Getty) Each spring, nearly 1,000 highly specialized technicians from around the US descend on the Palo Verde Nuclear Generating Station near Phoenix, Arizona, to refuel one of the plant’s three nuclear reactors. As America’s largest power plant—nuclear or otherwise—Palo Verde provides around-the-clock power to 4 million people in the Southwest.