Using the Hoover Dam as a battery by pumping water upstream during the day, thus reducing electricity generation.
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.
Saw it coming, I did, through my incessant weather forecast watching here in Toronto, Ontario, Canada. Warned, we were, by the sages of climate. Still we really did not know the gravity of the situation, nor that we were to lose power for 18 hours. As we are always prepared, this matters little, because we know where everything necessary is located and we have done this before. It is worthwhile reflecting on what worked and what needs improvement, so that the next one, an inevitable event, really, will be that much more fulfilling.