Coal is economically inefficient compared with distributed solar.

Nuclear is broadly on par in cost.

The health impact costs of running existing coal plants in Texas are higher than the cost of installing new rooftop solar. That's ignoring carbon costs, which could be the same again.

And that's at Texas install costs. While low for America they are double Australian costs mostly due to poor permitting regulations and lack of competition.

This artificially makes the gap between utility and rooftop solar wider.

So you're being weirdly specific in your desire for economic efficiency.