I mean they do very well with a wide variety of energy sources, but its peak summer and they use gas daily(about equal to their hydro generation).2030? Do you mean 2050?
California is almost 100% renewables in its power grid already..
the tsunami towards renewables is happening
By almost you mean most days it's around 80% renewable(well low carbon if you're including nuclear). which is excellent but not 100%. Almost impossible for most places to hit 100% without rationing, which is also fine.
https://app.electricitymaps.com/zone/US-CAL-CISO