Hydroelectric power plants convert gravitational potential energy into more useful forms with flowing water downhill during a turbine system to generate electric energy. The Hoover Dam on the Colorado River is 211 m high and generates 4.00 x109 kW · h/y. At what rate should water bellowing during the turbines to generate this power? The density of water is 1.00 kg/L. Suppose a total efficiency of 97.5 percent in converting the water's potential energy into electrical energy.