Got it. After looking into the details, it seems like Tesla received around ~$111M of additional benefit from SGIP due to being in-state. $111M isn't nothing, but I'm doubtful this is a big factor in Tesla's success.
In total, SGIP has issued $841M of incentives. SolarCity's market share is ~20%. The in-state incentive grants an additional 20%. $841M * .2 *.66 = 111M
There’s a bunch of other programs as well. I think la times did a write up in the past. There’s the california solar initiative, an california ev program as well. Would love to have the time to run this all down for you but frankly kids + life in general doesn’t allow for that...
Edit: not the best source but has some of the govt programs www.latimes.com/business/la-fi-hy-musk-subsidies-20150531-story.html%3f_amp=true
I find it tough to imagine Tesla pulling off its trajectory in any other state from the early days. He’s had some good tailwinds from the state until this spring.