Wood/biomass gasifiers were used during WW2 when gas was rationed in some areas. So they are practical, but with the current price of oil/gas I would not expect

Wood/biomass gasifiers were used during WW2 when gas was rationed in some areas. So they are practical, but with the current price of oil/gas I would not expect it is commercially viable. Wood is not the only source though, and there are current fuel sources that are wasted. Like it is common for farmers to burn the leftover straw after a harvest