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.
There are actually many examples! A recent one with good English copy is here: https://www.scmp.com/news/china/science/article/3225408/china-worlds-largest-hybrid-solar-hydro-plant-produces-electricity-tibetan-plateau