In electric power, energy storage: uses electric energy t pump water from a lower elevation reservoir to a higher elevation reservoir. When required, the water flows back from the upper to the lower reservoir, powering a turbine with a generator to produce electric energy [Section 2.11.4, DOE Department Circular No. DC2023-04-0008, Prescribing the Policy for Energy Storage System in the Electric Power Industry]
Note: See Energy Storage System (ESS).