- U.S. DOE - United States Department of Energy.
- NSES - Nebraska Solar Energy Society.
- National Renewable Energy Laboratory (NREL) - The U.S. Department of Energy's premier laboratory for renewable energy and energy efficiency research, development and deployment.
- Consumer Energy Information Home Page - The Consumer Energy Information site provides information on energy efficiency and renewable energy. Includes fact sheets, energy tips, access to energy experts, reference briefs, and a glossary.
- Davis Energy Group - Specialists in cooling and heating technology for residential, commercial, and institutional applications.
- Florida Solar Energy Center (FSEC) - A Research Institute of the University of Central Florida
- Rocky Mountain Institute - Home Page