There's no way to make money in this game. You start off only being able to make like 17% of the power the city needs, which means your reputation drops and that seems to lower how much money you make per watt to the point that fuel costs way more than you can make. The whole game is confusing and undocumented. Nothing is explained and after 7 tries at this game, I have gotten absolutely nowhere. I suggest you don't start charging people for this game unless you fix how horribly explained everything is.
The first heater works well with peat, or so it says, but when I set it on peat, the heater and all the boilers get broken even though the overall power plant heat isn't too high.