An energy storage system uses the excess power available overnight to pump water 50 metersup a hillfrom alake and into a reservoir. During the day, when extra power is required, the water is then released through a turbine and generateselectricity1. In this system, as shown in the figure, a pump with an efficiency of 80% is used to transfer the water up the hill.
a.How much energy is required to move the water up the hill [kJ/kg]?.
b.How much power does the pump actually require [kJ/kg]?
c.Why is your answer to (b) > (a) ?
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An energy storage system uses the excess power available
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