Batteries are not efficient at all. Minimal losses but the actual infrastructure is total shit as far as a solution goes. Higher losses with using a water/gravity battery. But it works and has extremely high unfaltering yields. Use "green" energy to power the pumps and gravity/natural rainfall for everything else.
Edit: plus you get drinking water reservoirs and recreational areas. It's a win, win, win, win.
Nifty about rain, I hadn't thought of that.
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