The outages that happen in CA are generally because of wildfires or concern about sparks causing wildfires. Not about insufficient capacity.Unfortunately nothing is usual about lithium mining and refinement. Nor about the fact that the grid might crash this winter. California here is demanding them but doing rolling power outages. I still feel that green energy isn’t actually green and is mostly from outside countries. Especially ones who don’t even care about anything but money.
Yes, CA does import some electricity… hydro-power from Washington state. The rest of CA’s green energy is generate in the state from Solar, Wind, hydro.
EV batteries are increasingly being built in the United States. Yes, many of the raw materials are imported. There is a lot of effort going into reducing or eliminating some of the problematic materials like cobalt. Lithium is produced in several countries like China, Bolivia, Australia. The US has a large supply of Lithium in the Salton Sea in CA and that will probably be used for EV batteries at some point.