At least in the USA the bigger challenge seem to be the energy company’s really fighting back against residential solar. California is facing some serious changes, I don’t think net metering is even an option in just municipal areas even more. I’ve heard around San Francisco they are going to start hitting folks with big grid connection fees every month.

In my area of North Carolina it’s the same thing, with the power company doing everything it can to make switching to solar less and less worth it. Just the cost of the panels are enough to do that for most people!