Editing Pumped-storage hydroelectricity (section)

==Types==
In closed-loop systems, pure pumped-storage plants store water in an upper reservoir with no natural inflows, while pump-back plants utilize a combination of pumped storage and conventional [[Hydroelectricity|hydroelectric plants]] with an upper reservoir that is replenished in part by natural inflows from a stream or river. Plants that do not use pumped storage are referred to as conventional hydroelectric plants; conventional hydroelectric plants that have significant storage capacity may be able to play a similar role in the [[Electric power transmission|electrical grid]] as pumped storage if appropriately equipped.