High Quality Content by WIKIPEDIA articles! The Energy Citations Database (ECD) was created in 2001 in order to make scientific literature citations, and electronic documents, publicly accessible from U.S. Department of Energy (DOE), and its predecessor agencies, at no cost to the user. This database also contains all the unclassified materials from Energy Research Abstracts. Classified materials are not available to the public. ECD does include the unclassified, unlimited distribution scientific and technical reports from the Department of Energy and its predecessor agencies, the Atomic Energy Commission and the Energy Research and Development Administration. The database is usually updated twice per week.