A filled reservoir has a water surface of 1200 acres and an available storage of 4000 million gallons. The watershed contributing to and including the reservoir covers 35 square miles. The dam of the reservoir contains a hydroelectric turbine with an available head of 120 ft and a mechanical-to-electrical efficiency of 83%. If the runoff of rainwater upon the watershed is 36 inches per year, and the evaporation from the reservoir surface is 8 in/year, then compute the average electrical output of the generator, in kW, assuming that all of the overflow goes through the turbine.