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.
For places without water, what's wrong with importing a bunch once? Evaporation suppressors exist to help with hotter climates.
You're probably right about the hills. Building a water tower that can hold an entire lake seems inefficient.
How are you importing an entire lake?
from somewhere import lake
lake.flow()
It's just that simple!
Use a very long hose.
Truck? 5G? Just let a tiny faucet run a long time? IDK.