The California Energy Commission has adopted building standards that require solar PV systems to be installed on all new build homes from 2020.
The US state's energy planning agency says the move is part of a plan to cut energy use in new Californian homes by more than 50%, and make them net-zero electricity consumers.
The solar PV rules will apply to single homes as well as apartment buildings up to three stories. It is thought that, on average, this will result in a $10,000 increase in the price of a new Californian house, which the Commission says will be offset by long-term energy savings.
Extract from Energy World magazine (published by The Energy Institute), June 2018 edition, page 4