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Whoa! That sounds really cool so I looked it up. It's called "Pumped-storage hydroelectricity" https://en.wikipedia.org/wiki/Pumped-storage_hydroelectricity ht

• mr_luc 10y ago
  Yeah, and I believe that it's the only game in town for storing really large amounts of electricity.
• MrBra 10y ago
  Also interesting: https://www.quora.com/Can-electricity-be-stored https://www.quora.com/Can-electricity-be-stored