A pumped-storage system is where water is pumped up into an elevated reservoir, and then allowed to fall to produce electricity. What is the basic reason this system is economical?
A. the electricity is being generated with a renewable energy resource.
B. it is more efficient to generate electricity when it is generated with gravity.
C. more electricity is generated than is used in pumping water into the reservoir.
D. surplus electricity at night is being used to pump water into reservoir.
E. the electricity is being generated with a non-carbon based energy source.
Answer: D
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