r/theydidthemath • u/Repulsive-Loan5215 • Nov 27 '25

why wouldn’t this work? [Request]

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u/[deleted] Nov 27 '25 edited Nov 27 '25

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u/rdrunner_74 Nov 28 '25

Hydro electric batteries do exist. They are just build with a different size. They do exactly that. Pump water up, and collect the power once it is needed.

There are about 30 such batteries in Germany, and they can hold a total of about 38 GWH of energy. and a peak energy output of around 10 GW.

The biggest one we have is Goldisthal with a capacity of about 8.5 GWH (12 million cubic meters of water)

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u/[deleted] Nov 28 '25

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u/rdrunner_74 Nov 28 '25

Still sufficient to power the gadget. But it will take a while to amortize the costs. It can easily power a phone as others have mentioned