In California, installers are required to have either a basic contractors license or possibly a C-46 Solar Contractors License. This license covers installations for photovoltaic systems, solar water and Area heating, and solar pool heating. Sunrun is one of the largest solar companies in the U.S., serving more than 1 https://californiasolarcompany.politics.blog/2025/11/19/reliable-solar-solutions-for-a-brighter-california-future/