Starting in 2020, all new homes in California must come with solar panels. Builders are getting ready

The Energy Commission worked closely with developers over the last five or six years to give the industry some flexibility…
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PostBulletin

https://www.postbulletin.com/news/business/starting-in-all-new-homes-in-california-must-come-with/article_48401b11-a522-518c-8831-2cb913688215.html