The article fails to cite a source so I'll have to look that up later but one thing they don't mention is how opposed to rooftop solar the electric utilities are. One reason is that they can't charge enough to cover the cost of supplying power to new homes when they are powered by solar too.
California became the first U.S. state to require solar panels on almost all new homes, sending the clearest signal yet that rooftop power is moving beyond a niche market and becoming the norm.