A very smart guy who goes by funkdoc wrote a couple of articles related to Power Grid. They were originally intended to go into the same blog that my articles were, but that blog no longer exists (which is why my articles have been posted here).
His articles are on his blog, which I would recommend anyways, but if you would like to see his Power Grid articles, here’s a link.
He has articles specifically related to 2P games, and also articles specific to most power plants that exist in the game, again with a 2P focus. Check it out!