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.
Batteries and synthetic fuels?
Did you read the post you’re replying to?
I find reading interferes with the posting
I don’t think batteries are designed for the duration of storage you want a backup of pumped hydro for, and it will remain to be seen what a synthetic fuel industry looks like (and whether it would ever be cost competitive with pumped hydro at the places where pumped hydro is currently viable).