U.S. DOE Energy Efficiency and Renewable Energy (EERE) 
U.S. Department of Energy web site for information on energy efficiency and renewable energy technologies.

National Renewable Energy Laboratory (NREL)  
U.S. DOE facility for renewable energy and energy efficiency research, development, and deployment. (Solar, wind, water power, geothermal, energy from plants).

Center for Energy Efficiency and Renewable Technologies 
News and information about clean power. CEERT campaigns cover a wide range of issues, such as sustainable electrical generation policies throughout the West, clean vehicles and energy efficiency and conservation.

International Centre for Solar Energy  
Organization established by the UN, supported by the Commonwealth, to promote the application of renewable energy technology in developing countries. Includes information about projects, activities, and technologies.

Sandia's Photovoltaic Systems Project  
Details on focused research and systems development integrated with the needs of manufacturers and users of systems and components. Features technical guide and overview of projects.

Renewables Fuel Page  
A site by the Energy Information Administration of DOE. Provides information on renewable fuels in the farm of data, charts and tables.

Energy Ideas Clearinghouse  
Offers content-rich databases for technical information on renewable energy regarding solar, biomass, geothermal, distributed generation, wind, hydro and other renewable resources.

Green Energy News  
Recent business and technology developments in clean, efficient and renewable energy for transportation, industry, government and home.

On-site Solar and Wind Power 
Tutorial explaining how to estimate power and energy yields of building-integral on-site solar and wind power conversion installations.

Renewable Resource Data Center  
Provides information on several types of renewable energy resources in the United States, in the form of publications, data, and maps. An extensive dictionary of renewable energy related terms is also provided.

Database of State Incentives for Renewable Energy  
Information on U.S. state and federal tax incentives for solar electric and other renewables, alternative-fuels vehicles, and energy conservation. Searchable database.

Solar Today Magazine  
Bi-monthly magazine that covers all renewable energy technologies, including photovoltaics, passive solar and other climate-responsive building, and wind power.

Solar Energy International  
Renewable Energy Education for Sustainable Development. Teaches people the practical use of renewable energy technologies, including electricity from sun, wind or water.