The prices quoted in the link are for utility sized wind and solar farms, but as more contractors get into the business doing small systems, the labor component of home sized systems is going to shrink dramatically over the next decade or so, making having your own a no brainer in sunny ...
Surface rail and highway work are mature industries, and dominated politically by contractors and labor. Going underground can mean going mostly automated, and avoiding most of the politics. Plus tunneling using NEW methods seems to be a whole new ballgame, in terms of construction costs.Doug...