Advanced Biofuels Association
American Coal Council
American Gas Association (AGA)
American Solar Energy Society (ASES)
American Wind Energy Association (AWEA)
Database of State Incentives for Renewables & Efficiency
Energy Institute, University of Oklahoma
Geothermal Energy Association
Global Energy Management Program, University of Colorado Denver
Independent Petroleum Association of America
International Energy Agency (IEA)
National Renewable Energy Lab (NREL)
U. S. Department of Energy
U. S. Energy Information Administration (EIA)
