The new California Energy Commission building code — the first of its kind in the US — will require (in all new homes) rooftop solar panels with enough energy efficiency measures like insulation and better windows that all new single-family homes and low-rise apartments will use net-zero electricity. This means that their solar array should offset all electricity use for cooling, plug-in equipment, and lighting on an annual basis. The fifth-largest economy in the world runs right past the rest of the United States – once again.