A one-stop information source on energy technology

Since 1987, the Energy Technology Data Exchange has provided access to a wide range of references on energy technology, use, environment and climate issues, policy, economic factors, alternative energy and conservation. At present, 4 million references are available through the internet, including an advanced search facility. Many recent reports are available in full text. The database has a world-wide scope, and contains references in multiple languages.

If you're a national of one of the countries participating to this IEA agreement, you may very well be entitled to free access to it all.