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Error_404_403 t1_j0m7ilo wrote

Provided electric motor efficiency is around 90%, pump friction energy losses are extra 10%, and generation efficiency is 80%, we have overall 60 to 70% of the energy to be stored can be recovered later on. This is a very good number, comparable to the EV battery charging efficiency of 90%. AND, unlike the battery, the number of charge/discharge cycles is not limited for the hydroelectric storage!

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