Wood

This page refers to the use of wood as a fuel.

Wood is an organic substance that has been used as a fuel for thousands of years. It can even be burned as biomass to produce electricity. Because of the water content in the fuel, energy density can change, but a standard value is around 16 Megajoules per kilogram. Even keeping warm by a fire is using wood as fuel.

Energy Density

16.2 MJ/kg

Depending on how the wood is cut, it can have a high power density (kindling), or a fairly high energy density (logs).

There is no question that wood is renewable energy, because it regrows once it has been cut. However, whether or not wood is a sustainable energy fuel is an interesting question, please see renewable vs. sustainable energy.