Solarpunk

I did some work at a place called The hollow mountain that does this. But seeing as it looked like an underground James Bond bad guy base and I was a rope access mook in a boiler suit, I felt like I could die at any moment by tuxedo clad hero.
It wasn't solar they used to power pump the water back up though. They just, hmm I want to say, bought cheap electricity when no one was using it.