The International Energy Agency acts as a policy advisor to 28 out of 30 OECD member countries. Founded during the 1973 oil crisis, its initial role was to co-ordinate measures to deal with oil supply emergencies. Members are required to hold oil stocks equivalent to at least 90 days of net imports; in practice, they are often lower. Its role has since expanded to include the analysis of and the development of policies on climate change, oil markets and energy technology. It is an authoritative source of energy statistics.

See also: http://www.iea.org/index.asp