NRLE – Renewable Resource Data Center
http://www.nrel.gov/rredc/models_tools.html

Database of State Incentives for Renewables & Efficiencies
http://www.dsireusa.org/

Energy Information Administration
http://www.eia.doe.gov/

Solar Energy Industries Association
http://www.seia.org/

American Solar Energy Society
http://www.ases.org/

International Solar Energy Society
http://www.ises.org/ises.nsf!Open

U.S. Department of Energy
http://www.eere.energy.gov/

Solar Electric Power Association
http://www.solarelectricpower.org

The Solar Energy Consortium
http://www.thesolarec.org

Society for Environmental Graphic Design
http://www.segd.org

U.S. Green Building Council
http://www.usgbc.org