This week, the San Francisco Board of Supervisors enacted an ordinance that will require that the developers of all new buildings of 10 floors or less that apply for building permits after January 1, 2017 install solar PV or solar thermal systems. 
I’m not an expert in the California Code of Regulations, so I’m not familiar with all of the potential exemptions, but the only one stated in the new ordinance is for buildings (residential or non-residential) with a “solar zone” of less than 150 contiguous square feet.… More