Energy efficiency

General energy efficiency resources

• American Council for an Energy Efficient Economy 
• Energy Ideas Clearinghouse 
• Energy NewsBriefs 
• EnergySavers
• Energy Star Program

Other energy efficiency resources

Agricultural efficiency

• California's Energy in Agriculture Program 
• Center for Irrigation Technology 
• Rural Electricity Council 
• University of California at Davis's Sustainable Agriculture Research and Education Program 
• USDA National Resources Conservation Service

Building efficiency

• Building Performance Institute 
• Commercial Buildings Research Projects — National Renewable Energy Laboratory
• DOE Building Technologies Program
• Advancing Building Energy Codes
• Commercial Building Initiative
• Weatherization Assistance Program
• Energy and Environmental Building Association 
• Energy Star Buildings Program
• Green Building Resource Guide 
• Insulation Fact Sheet — Oak Ridge National Laboratory
• National Fenestration Rating Council 
• National Institute of Building Sciences 
• Oikos: Green Construction Source 
• United States Green Building Council  

Commercial and industrial efficiency

• DOE Advanced Manufacturing Office
• Environmental Energy Technologies Division — Lawrence Berkeley Laboratory
• FacilitiesNet 
• Improving Productivity by Investing in Energy-efficiency 
• Industrial Technologies Program — Pacific Northwest National Laboratory
• International District Energy Association 

Electrotechnologies

• DOE Energy Citations Database
• Electric Power Research Instititute 
• National Technology Transfer Center 

Equipment and systems

• Air-Conditioning, Heating and Refrigeration Institute 
• American Society of Heating, Refrigeration, and Engineers 
• Energy Star products
• Energy Star Residential Heating and Cooling Program
• Energy Star Residential Lighting Fixtures
• Geothermal Heat Pump Consortium National Information Resource Center 
• The Lighting Resource 
• Lightsearch 
• TopTen USA Energy Saving Products 
• Western Cooling Efficiency Center 

Federal efficiency programs

• DOE Office of Energy Efficiency and Renewable Energy
• Office of Science Laboratories
• Regional Offices
• Vehicle Technologies Program
• Energy Information Administration
• EPA State and Local Climate and Energy Program
• Federal Energy Management Program

Residential efficiency

• EfficiencyFirst 
• Energy Saver Tips for the Home
• Energy Star New Homes Program
• Going Green: EcoFriendly Property Upgrades 
• Home Energy Saver 
• Home Energy Magazine 
• Home Energy Retrofit Programs for Local Governments 
• HomePower Magazine 
• National Affordable Housing Network 
• Residential Energy Services Network 
• Stay Cool/Stay Warm, Save Money

State and local efficiency programs

• Association of State Energy Research and Technology Transfer Institutions 
• California Institute for Energy and the Environment 
• DOE State Energy Program 
• Energy Upgrade California 
• Iowa Energy Center 
• Kansas Corporation Energy Division 
• National Association of State Energy Officials 
• ReCharge Colorado

Transmission and distribution efficiency

• EPA Energy Star Transformer Program 
• The Journeyman Lineman Connection 
• National Institute of Health's Electric and Magnetic Fields Research and Public Information Dissemination Program 
• North American Electric Reliability Council's Reference Documents 
• Superconductivity for Electric Systems — Oak Ridge National Laboratory