
Using the Hoover Dam as a battery by pumping water upstream during the day, thus reducing electricity generation.
I had heard about this idea before, and think it requires further study. The problem is that we cannot easily store electricity. Any electricity generated needs to be used immediately, or we risk blackouts.
California has a lot of wind and solar power generation, but also has hydroelectric power generation from the colossal Hoover Dam. If operated at the same time there might be too much power during the day, when wind and solar contribute, and not enough power at night, when wind and solar do not generate electricity. Excess generated electricity cannot be stored.

Sunforce 12v Power Sports Charger 50014 is but a battery maintainer, not a charger
Solar power has always been enticing idea. You point a panel to the lovely sun and it returns usable power. With few exceptions the sun rises each and every day, so theoretically you have unlimited access to power. Unfortunately the reality of economics creeps into the equation, initially taking the shine off solar power. Wanting to play with the technology, a Canadian Tire sale on small solar panels allowed me to try it out.