About 65 percent of the biomass consumed in the U.S. comes from forestry resources and is obtained from two primary sources:
Fuelwood is harvested in forests and combusted directly to obtain heat in residential and commercial sectors, in addition to power in the electric utility sector. Together, these sectors account for 30 percent of current consumption of forest biomass and about 20 percent of total U.S. biomass energy consumption. In 2009, the three sectors consumed about 38 million dry tons of wood.
Generated in the manufacturing of forest products, residues come from three major sources: primary and secondary mill residues generated in the processing of roundwood, roundwood products, and pulping liquors. In 2002, primary processing mills produced about 87 million dry tons of residues in the form of bark, sawmill slabs and edgings, sawdust and peeler log cores. Currently, very little of this resource is unused.