There are hundreds of non-profits working in the clean energy and energy efficiency sectors. Below are some we recommend.

• American Council for an Energy-Efficient Economy
• American Council on Renewable Energy
• American Solar Energy Society
• Business Council for Sustainable Energy
• Center for Small Business and the Environment
• Earthwatch
• Environment and Energy Study Institute
• Global Environmental Technology Foundation
• Interstate Renewable Energy Council
• International Solar Energy Society
• Renewable Energy Policy Project
• Rocky Mountain Institute
• Solar Energy Industries Association
• The Solar Foundation