> Rooftop solar can't be economically efficient without subsidies of some sort. How could it outcompete the economies of scale of putting an extra 10 panels in

> Rooftop solar can't be economically efficient without subsidies of some sort. How could it outcompete the economies of scale of putting an extra 10 panels in a utility-scale installation 50 miles away? By not using expensive land (since it's on top of a building that existed anyways).