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FriendlyDespot t1_j0m55fq wrote on December 17, 2022 at 6:39 PM

Reply to comment by The_Ombudsman in Switzerland’s Giant “Water Battery” Starts Working by Wagamaga

Between inefficiencies in the pumping, and inefficiencies in the generating turbines, pumped hydro storage is around 75-85% efficient. It's pretty great.