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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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020
British Dictionary definitions for 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 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012