[robocat]

Simply too expensive, and large scale can undercut: "We know that residential rooftop solar is much more expensive than grid-scale renewables. At least 4 times more expensive, according to Lazard estimates.", from "Does Rooftop Solar Help the Distribution System?" https://energyathaas.wordpress.com/2018/06/25/does-rooftop-s...

Also the home owner takes on the financial risk of the install. If a utility installed on homes they would need to have a lien on the home, legal costs, marketing costs, and they would still have other risks of default.

The article mentions one place it does make sense: "Cohen and company find capacity benefits exceeding $60 kilowatt-year in the top 1% of all locations. This is about 10 times what they find for average capacity benefits. It makes sense that, for example, certain circuits are very close to needing a capacity upgrade, and that benefits would be large in these places."