We're getting there: California does[1] require solar installation on many new builds, and has followed Australia in doing automatic permit processing[2] to streamline installation. It's possible to pay around $20k for an average home, and in as little as one week have 100% of your power bill covered by solar.

[1] https://www.greenlancer.com/post/california-solar-mandate

[2] https://www.energy.ca.gov/programs-and-topics/programs/calif...