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"For small-scale domestic applications of biomass the fuel usually takes the form of wood pellets, wood chips or wood logs..."
http://www.energysavingtrust.org.uk/generate_your_own_energy...

"Biomass continues to be a major source of energy in much of the developing world. In the United States wood and waste (bark, sawdust, wood chips, and wood scrap) provide only about 2 percent of the energy we use today."
http://www.eia.doe.gov/kids/energyfacts/sources/renewable/bi...

"Dry combustible biomass fuels, such as these woodchips from forestry wastes, can be burned to produce heat or power. "
www.energyprojects.co.uk/biomass.htm