i) How much electric energy can be made by the hydroelectric generator from water in lake which is 2000 meters wide, 100 meters deep, and 8000 meters long if all water falls through the vertical distance of 500 meters? Suppose generator is 90% efficient in converting potential energy in electrical energy. State answer in kWh.
ii) Determine value of electrical energy made from draining the volume of water if electricity rates are $0.10 per kWh.
iii) If lake is drained over the period of one year, determine average electrical power output in MW.