Question

The only pumped hydroelectric storage plant in Canada is the Sir Adam Beck Pump Generating Station in Queenston, Ontario near Niagara Falls. The upper reservoir at this facility can hold 20,000,000 m3 of water (that is 20,000,000,000 kg) and it is 21 m above the lower reservoir. Complete calculations using the GRASP method where appropriate to answer the following questions. Remember to express your answers using the correct number of significant digits. 1. How much gravitational potential energy is contained in the upper reservoir when it is full? 2. At night, when electricity demand is low, water is pumped to fill the reservoir over an 8 hour period. The pumps draw 155 MW while they are operating during this time. What is the total input energy supplied to the pumps? 3. During the day, when electricity demand is high, water flows out of the reservoir through the turbines to generate electricity. The reservoir can be emptied in about 6 hours while the turbines and generators supply 174 MW of electrical power to the power grid. What is the useful output energy supplied by the generators? 4. What is the efficiency of the pumped storage system?

          The only pumped hydroelectric storage plant in Canada is the Sir Adam Beck Pump Generating Station in Queenston, Ontario near Niagara Falls. The upper reservoir at this facility can hold 20,000,000 m3 of water (that is 20,000,000,000 kg) and it is 21 m above the lower reservoir.

Complete calculations using the GRASP method where appropriate to answer the following questions. Remember to express your answers using the correct number of significant digits.

1.	How much gravitational potential energy is contained in the upper reservoir when it is full?
2.	At night, when electricity demand is low, water is pumped to fill the reservoir over an 8 hour period. The pumps draw 155 MW while they are operating during this time. What is the total input energy supplied to the pumps?
3.	During the day, when electricity demand is high, water flows out of the reservoir through the turbines to generate electricity. The reservoir can be emptied in about 6 hours while the turbines and generators supply 174 MW of electrical power to the power grid. What is the useful output energy supplied by the generators?
4.	What is the efficiency of the pumped storage system?

Added by Fran S.

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