There are quite a few in CA. We have them at several places where I live; on campus, around town. I know people who have them in their homes. They are pretty trivial to set up if you have solar (everyone has solar), especially if you have battery backup already. I've seen quite a few Tesla ones in the Bay area, on highway 5 (runs N to S through CA). I've seen pictures of more in LA. I don't know. The infrastructure does exist, even if it's not ubiquitous.

The real problem with electric cars (batteries) and solar is really just the pollution from mining the minerals, the manufacturing and the recycling infrastructure. These are technologies that can be worked on.

I am neither pro nor anti electric in any meaningful way. I think its cool tech. There is nothing fundamentally wrong with it. There is nothing fundamentally wrong with petroleum. Both can advance their tech and make better, less polluting products. Both have people who lie about both their advantages and disadvantages.

The truth is, both can be made to work with minimal pollution. As for "muh carbon dioxide" I think that is pretty much a myth (at least in the scope of its effect), so the CO2 from either product is meaningless imo. Pollution IS a problem with both however, but that is a problem that is also solvable with advances in tech and infrastructure.