https://www.maine.gov/energy/heating-fuel-prices

All other things aside, it all comes down to cost per BTU, and cordwood is consistently the cheapest, often by far. It will likely remain so especially with electric rates going up. It’s a little work (handling, etc) but a wood stove is the cheapest heat in Maine. I live in a fairly small house (1300 sq ft) in Aroostook and burn about 3 cord a year at ~130 a cord (I buy tree length and process it myself, I consider it to be a gym membership that pays me). It’s dirt cheap, dries the house out and nice to look at. I have oil heat mostly for shoulder seasons or to keep the house from freezing if I’m away. Less than half a tank of oil most winters.