108
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. 
I'm more into the big wheels in concrete wells, but different solutions are required for different areas and it's all better than fucking PtX bullshit hydrogen.
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