Part of the problem is that rooftop solar doesn't really make sense in the United States. It does make sense in Japan, possibly England, some parts of Europe, a

Part of the problem is that rooftop solar doesn't really make sense in the United States. It does make sense in Japan, possibly England, some parts of Europe, and maybe Miami and New Orleans. But in most of the country, solar farms are just a better value proposition. You've probably seen the numbers that if we just used the land currently growing corn for ethanol fuel, we could power the whole country. And we have a lot more empty land than that. The smart money also saw those figures, realized that there is no long-term market, and took their ball and went home. Installing stuff in cities — even suburbs — is expensive. Installation costs now dominate solar costs. Modus ponens, rooftop solar loses. The exceptions I mentioned are swampy places where open land is very expensive to build on.