Next year, that number will surge as new building standards take effect requiring all new homes permitted after Jan. 1 to have solar photovoltaic systems.

More than 868,000 California homes have solar panels that are interconnected to the state's power grid, with a total generating capacity of almost 4.8 million kilowatts. Those solar panels connected to the grid will also be shut off if they are in areas where PG&E is cutting off power. Those homes will only have power if they have battery backup like the Tesla Powerwall or a gas generator.

California has 10-11 million homes.