If that ruling applies to only new home construction, which it seems to, then what kind of a dent do they think it will have on the grid? How much room is there left in CA to build new homes? If it does not also include used home sales, then it is going to have zero impact on the grid and climate. Wasted effort.
I guess not enough people willing to pay 1.5 million for a 800 sq feet home with aluminium wiring and corroding plumbing.