“they STORE electricity from the only reliable sources, coal or nuclear power plants.”
ONLY? Hydroelectric is not a reliable source? I’ve yet, in my 70 years known of a time Columbia and Snake River dams weren’t producing electricity.
Hydro generated power was “big” 80 or 100 years ago. Not so, today, not that much percentage-wise. Maybe 5-6%. Less if they keep breaching dams.
It is a reliable source, just not in my neck of the woods....Sheesh