pumped storage

a system for generating hydroelectric power for peak periods by pumping water from a lower to a higher reservoir during low-demand periods and then releasing it during peak periods.
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World English Dictionary
pumped storage
(in hydroelectric systems) a method of using power at a period of low demand to pump water back up to a high storage reservoir so that it can be released to generate electricity at a period of peak demand

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Pumped storage is a tried and proven technology, with a high efficiency, and
  zero emissions.
Both the wind generation and pumped storage are renewable, zero emission
  generation sources.
Many hydro plants might also be pumped storage facilities at better efficiency
  than can be expected from compressed air storage.
Pumped storage would work for them, as would reverse osmosis water production.
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