I just found this stackexchange post[1], that claims 350g of wood would be enough to power 1Kwh, but a user points out that half the heat would be lost in exhau

I just found this stackexchange post[1], that claims 350g of wood would be enough to power 1Kwh, but a user points out that half the heat would be lost in exhaust. Maybe that's what the article was referring to, a significant loss of energy to the efficiency of extracting meaningful work from burning wood, with stone age tools. 1: https://sustainability.stackexchange.com/a/4601 https://sustainability.stackexchange.com/a/4601