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Submission + - Using a water tower to store energy

An anonymous reader writes: It seems to me that the greatest challenge for many alternative energy sources like solar, is continuity. Although fancy maglev flywheels are promising, nothing commercial is out yet.

Does anybody know why a low-tech solution like pumping water into a tower, during the day, and letting it come down while turning a turbine at night is not a good straightforward solution?

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