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. 
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.
Within ecological limits I guess? That is the only real cause for concern with whatever gets you nerds hot - renewables or nuclear. Storage is necessary for both intermittant and the category of 24x7 until it’s not and suddenly you have to have 1.6GW types of power generation. And from the wikipedia articles I have skimmed pump hydro is the gold standard.