Photo licensed from 123RF. 2026-05-20T08:40:00-07:00 David Williams Arizona was made for solar energy. With more than 300 days of sunshine per year and some of the highest solar irradiance levels in North America, the state is a natural laboratory for what widespread residential solar adoption looks like. And increasingly, Arizona homeowners, from Scottsdale to Tucson to the West Valley, are not just talking about solar. They’re installing it.