Want to produce your own electricity, heat, and have a biochar “waste” to improve your garden? Running afoul of the outdoor woodboiler restrictions? Then a gasifier can be the answer. A gasifier cooks the gases out of the wood, which can then be used for heating or running a engine / generator. You could even power a vehicle with this. The heat generated by the unit can heat domestic or space heating hydronic systems. The charcoal “waste” is an awesome soil amendment for your garden. There’s very little to no pollution, and no smoke or odors. Waste wood from sawmills or other wood process (including old pallets or construction debris) are sufficient, no new wood needs to be cut.
For more info, see http://green-trust.org/woodgas