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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. 
Putting the big wheels in wells is a waste. We should build them up into the sky so everyone can look at the big wheels and feel happy.
Sadly the big wheels need to be in big wells in order to conserve as much energy as possible