Rural low-income families are the new growth leaders in renewable energy production. Recently released US Census figures show the number of households heating with wood grew 34% between 2000 and 2010, faster than any other heating fuel. Electricity showed the second fastest growth, with a 24% increase over the last decade. (Kilwa Biomass Wood Energy News, October 14, 2011)
2010 US Census page: Households with Primary Wood Heat by State.
For more information on heating with wood take a look at the University of Maryland Extension publication entitled Heating with Wood in Maryland.