The Mormon Flat Dam was completed in 1926, the first of three dams along the lower Salt River, between Theodore Roosevelt Lake and Phoenix, two of which have powerhouses with reversible turbines, enabling pumped storage functions. The Mormon Flat hydroelectric plant has a conventional turbine, producing 10 megawatts, and a reversible unit that was installed in 1971, adding another 50 megawatts to the plant’s generating capacity, and enabling the plant to pump water backwards through the Salt River Project system, a network of several hydropower plants and reservoirs that provide electricity to the Phoenix region.