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It’s actually not anything new. It’s called Pumped Storage Hydropower .
Yes I know it exists. Now how much would space would such a system require in order to power a city of 1,000,000 for 1day.
Why do you keep asking this? How is this specific number relevant to the discussion?
It’s just the base-level unit I’m using to demonstrate the scale required. You can use any other number you want, but we need to multiply by the number of people and the amount of stored energy required for them.