EnergyFiles is a virtual library of over 500 science and technology databases and Web sites. Sponsored, developed, and maintained by the Department of Energy's Office of Scientific and Technical Information (OSTI), EnergyFiles provides access to information, tools, and technologies relevant to the Department of Energy (DOE), with an emphasis on the physical sciences.
Energy Files is a DOE Science Accelerator Resource. The DOE Science Accelerator searches multiple science resources, including EnergyFiles. These resources, developed by OSTI, reside in the deep Web where popular search engines cannot go. The DOE Science Accelerator provides a "deeper" search that yields results ranked by relevancy. This search may take a little longer, but returns more comprehensive, higher quality science information.
http://www.osti.gov/energyfiles/index.html