The energy mix of the physical grid (the western interconnect in this case) is what matters for stability. (in places with limited transmission this is more complicated but at a state level it's approximately true).

articles like this talking about high solar or wind in one state are tricking people into thinking we're can actually increase inverter power sources past about 25-30%.

local power authorities power mix data is about contracts and paper not energy.

this kind of article is basically just lying to people.