Look at the progress that's been made in the last twenty years, my lord, putting a solar system in a new build costs as much as a conventional system. It's cheaper to install a system in an existing building. The problem is that there exist businesses trying to wring more profit, like leasing the system and tying into the grid. If I ever built a system, I'd never tie into the grid, because somehow they'll make you pay. And they are trying to restrict what you can do with your property, like no catchment systems, wind systems (although I can see restrictions on towers that can impact other properties), solar systems and tie ins to the grid, and no group systems because they term them a small utility.
All this is to support profit generating utilities. The key word is profit of grid systems.