I did go back to burning wood. Per watt of heat it's roughly ⅓ of the price where I live and with the specific set up I have. However the largest drawback of wood is that it entails a lot of manual work. First I have to spend a dozen hours carrying wood into the basement during autumn. Then during winter I have to go down 2-3 times a day to feed the furnace. However to me it's worth it. It's a comfy ritual that saves 5-20 euros every single day during winter depending on what the electricity price is that day.