The U.S. Department of Energy website offers a great extent of energy information including Science and Technology, Energy Sources, Energy Efficiency, The Environment, Prices and Trends, National Security, Safety and Health.

• DOE Energy Sources: Solar
  The Department of Energy’s Solar Energy Technologies Program, managed by the Office of Energy Efficiency and Renewable Energy accelerates the development of solar technologies as energy sources for the nation and world. The solar program also educates the public about the value of solar as a secure, reliable, and clean energy choice.
• Energy Efficiency and Renewable Energy
  Includes Biomass, Hydrogen and Fuel Cells, Solar Energy, Wind and Hydropower Technologies, also the Alternative Fuels Data Center, a vast collection of information on alternative fuels and the vehicles that use them.
• Energy Information Administration
  See Energy A-Z on the left side and go to Solar under 'S.' Search also By Fuel and then Renewables. olar Thermal under Technology Type gives manufacturing information. See also Renewables Publications, Recent Monthly Statistics, Annual Data and Projections.
• Office of Scientific and Technical Information
  Search vast collections of DOE research via federated search technology: Science Accelerator, Science.gov, and WorldWideScience.org.