This is in addition to, if the battery is plugged in at home with solar panels, the home can self-smooth and do a lot of this locally, giving the grid the net in/out it desires from the house based on sum of: battery, appliances, solar as a whole unit.
That aside, there are a variety of electricity storage mechanisms that have been becoming more and more efficient, like normal batteries, hydrogen electrolysis, and pumped water. With some clever engineering, solar power works at night.
I wish California would keep their nuclear plants open, but the loss of them is not an impediment for electric vehicles.
Wind farms generate the most power at night, so that'll continue to work. If solar becomes dominant, then they'll make it cheaper to use electricity when the sun's still up, and we'll stop delaying charges until after sunset.
It's going to take decades to fully transition to electric vehicles, plenty of time to build all the renewables needed, all the storage needed for time shifting, and all the smarts needed for cars to participate in the smart grid.
https://www.nrel.gov/analysis/los-angeles-100-percent-renewa...
https://ceo.lacounty.gov/2021/12/07/sustainability/staying-p...
Maybe Californians will be riding horses in the next 10 years ;)
In other words, shift the demand from the 4-9PM slot that is the hot spot.
For what this doesn't cover, this is not rocket science. We will build the capacity. It's just wires and generators.
I work at an engineering firm that is heavily involved in these efforts in SoCal, and this is probably boring to say (without details) but the storage component is fascinating. Not my sector, though, so I won’t/can’t elaborate (I do work in sustainable transportation planning, though).