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[0] Pine chips (example of forest residues from timber and fiber harvests) [1] 8,000-9,120 [2] 10-20 dry tons/acre of on-site residues following logging; harvested every 20-40 years [3] Relatively inexpensive if chips produced at the roadside as a byproduct of wood processing Infrastructure to handle forest residues exists [5] An expanded ethanol industry using wood can also be an additional source of biopower as a co-product [4] 
High retrieval cost when tops and branches collected in forest due to labor-intensive collection and transportation Tops and branches may not be accessible or environmentally sustainable to remove for chipping, depending on location and soil type
Biomass Feedstocks for Biopower in the United States
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