That's very interesting. Right now California seems to run about 40-60% renewable according to https://www.electricitymap.org/?page=country&solar=false&rem...
California is at a bit of a tipping point. It has so much renewable energy, it has to pay other states to export their excessive energy because they don't have enough storage [1]. So you have to decide if you're going to subsidize utility scale energy storage to help drive it below the cost of fossil and peaker generators (which, it appears, California is prepared to do). It also helps that renewables are quickly approaching 1-2 cents/kwh at utility scale, as more of your cost can be storage (as your generation is almost free). China is ending subsidies of their solar manufacturing industry [2], which is going to push down the cost of panels, increasing the rate of uptake. You will see California meet their 100% renewable mandate much sooner than they're targeting.
A side effect is this is going to cause extensive losses to investor owned fossil generators. C'est la vie.
[1] https://www.zmescience.com/science/california-renewable-ener...
[2] https://www.reuters.com/article/us-usa-solar/chinas-solar-su...