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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. 
I thought salt was cheap.
I guess cleaning up after a huge salt spill isn’t its also probably terrible for the ground when it leaks. From reading Wikipedia it also uses an obscene amount of fresh water.
Is seawater too "dirty"?
I mean it also contains salt ;) as I said salt is corrosive sea water has 35 parts per thousand of salt in it and look how corrosive that is. Here we are talking about hot molten salt…