The problem is that Cali wants to increase their energy needs by 10x to cover all their future electric cars.
That number seems way too high to me. As of the end of 2022, California had just 28.2 million cars and light trucks burning gasoline (and 1.1 million BEV/PHEV/FCVs, with about 764k of those being full BEVs).
To move everyone to electric, then, means moving 28.2 million cars into that BEV column, plus 300k PHEVs. All told, that's about 28.5 million. On average, Californians drive 12,524 miles per year. So that's 356,934,000,000 electric miles. At an average of 3 miles per kWh, that's 118,978,000,000 kWh per year, or 118,978 GWh per year.
California currently uses about 287,220 GWh annually. That means if you ignore time of day concerns, if California moves every car and light truck to be fully electric, it would increase California's power consumption by only about 42%, not 900% as you're implying. Your numbers are off by more than a factor of 20.
California increases its energy output by a couple of percent every year, so even if they do nothing more than they're already doing (and assuming all other consumption miraculously remains flat), California could theoretically meet those capacity needs within two decades, which is long before the last gasoline-powered car goes away.
But given that California's daytime energy usage already peaks at almost half again more than its nighttime use, that means you could probably electrify close to half of those cars right now, without adding any more capacity, assuming you can get people to charge during the troughs or otherwise smooth out the power consumption over the course of the day.
Taking capacity offline seems shortsighted.
On this, we agree.