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Message: <blockquote data-quote="Aki992" data-source="post: 24361116" data-attributes="member: 557018">Pumped Hydroelectric StorageExecutive SummaryPumped hydroelectric storage facilities store energy in the form of water in an upper reservoir, pumped from another reservoir at a lower elevation. During periods of high electricity demand, power is generated by releasing the stored water through turbines in the same manner as a conventional hydropower station. During periods of low demand (usually nights or weekends when electricity is also lower cost), the upper reservoir is recharged by using lower-cost electricity from the grid to pump the water back to the upper reservoir. Reversible pump-turbine/motor-generator assemblies can act as both pumps and turbines. Pumped storage stations are unlike traditional hydroelectric stations in that they are a net consumer of electricity, due to hydraulic and electrical losses incurred in the cycle of pumping from lower to upper reservoirs. However, these plants are typically highly efficient (round-trip efficiencies reaching greater than 80%) and can prove very beneficial in terms of balancing load within the overall power system. Pumped-storage facilities can be very economical due to peak tand off-peak price differentials and their potential to provide critical ancillary grid services.<a href="http://energystorage.org/energy-storage/technologies/pumped-hydroelectric-storage" target="_blank">http://energystorage.org/energy-storage/technologies/pumped-hydroelectric-storage</a><a href="https://link.springer.com/article/10.1007/s40095-017-0237-5" target="_blank">https://link.springer.com/article/10.1007/s40095-017-0237-5</a><a href="https://link.springer.com/chapter/10.1007/10858992_7" target="_blank">https://link.springer.com/chapter/10.1007/10858992_7</a></blockquote>

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