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What do hexbears think about pumped hydropower storage?
(hexbear.net)
To make solar power viable, we need a solution for overnight energy storage.
Batteries are complicated.
Do you know what isn't? Water go up. 
Of course not all of the energy used to power the pump is lost (that's the whole idea) but there is still some energy loss. Maybe it's only a small amount like you say with the turbine but that's what I was referring to.
Yeah, I see what you mean.