- American Solar Energy Society
- Dedicated to advancing solar energy technologies. - Arizona Solar Center, The
- Promotes renewable energy, educates residents on solar technology developments, and supports commerce and industry in the development of sustainable technologies. - Australian and New Zealand Solar Energy Society (ANZSES)
- Aims to promote social and economic development through the environmentally sound utilisation of solar energy. - Boston Area Solar Energy Association (BASEA)
- Encourages the use of solar and other renewable energy sources in the greater Boston area through educational and service activities. - Central American Solar Energy Project
- Promotes the construction and use of solar cookers by supporting community projects in Central America. - El Paso Solar Energy Association
- Solar design guidelines, energy efficiency tips, solar water distillation (Stills), student energy education development and more. - Greenstar: Solar Community and Telecommunications Center
- Nonprofit bringing solar power, telemedicine, distance learning, electronic commerce, and support services to developing countries, and all places where a centralized electrical power grid is not available. - International Solar Energy Society
- Non-governmental global scientific organisation for the advancement of renewable energy technology and sustainable development. - National Solar Power Research Institute, Inc.
- Educational materials, research, and projects related to Earth-based and space-based solar power. - New Mexico Solar Energy Association
- Promoting Renewables and Sustainable Living since 1972. Focused in Northern New Mexico. - Passive Solar Industries Council
- PSIC offers professional training, consumer education, and analysis tools. - Planetary Engineering Group Earth
- Know how to solve current environment problems and to advance to the age of solar energy - Solar Century
- Nonprofit organisation dedicated to building markets for solar power. Run a solar power buyers club and a solar investment forum. - Solar Electric Light Fund (SELF)
- Nonprofit charitable organisation founded to promote, develop, and facilitate solar rural electrification and energy SELF-sufficiency in developing countries. Administers a carbon neutral club so people can offset their person CO2 emissions. - Solar Electric Power Association
- Collaboration of utilities, energy service providers, and the photovoltaic industry working together to create and encourage commercial use of new solar electric power business models. - Solar Energy Industries Association (SEIA)
- National trade association for all solar businesses and enterprises in the fields of photovoltaics, solar electric power, solar thermal power, solar building products. - Solar Energy International
- Renewable energy education and sustainable development. - SolarQuest
- Offering current new as well as the SolarQuest Virtual SchoolHouse, a system to communicate and maintain information about all aspects of solar energy technology and development. - Texas Solar Energy Society
 - U.S. Department of Energy Photovoltaics Program
- Large collection of information on photovoltaics (solar electricity cells), including a thorough tutorial on the science. - UK Solar Energy Society
- Nonprofit organisation working to promote the development and application of solar and renewable energies in the U.K. and world-wide. - Why Not Solar?
- Not-for-profit organisation with the objectives of educating on renewable technologies, and working with extablished NGOs to provide them with qualified volunteers for installing solar energy in remote villages.
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