I like the concept, I think that it fits the theme well, and I get the SimCity for DOS presentation vibes for sure.
I recommend adding a section about controls if you get a chance. I had to press "space" to unselect a building (not sure if mouse was also an option, but didn't seem to work). Secondly, there's a bug that causes reset to fail. It worked on the very last level, but didn't work on an earlier one. You might want to add a note about it if you can reproduce the issue.
My only problem with it is that there's just not much depth to the decision making, because the cost/benefit analysis of 1:5 is just to simple. Easy ways to remedy that without blowing up scope would have been something like "solar powers in a radius, whereas power lines power linearly," or to have power output capacity that drives the placement of "hubs".
I hope you get a chance to explore the concept more. I can definitely see a place in my Steam library alongside tiles such as Mini Metro for an endless power-grid simulation.
