World Energy Outlook 2006

Mt million tonnes (1 tonne x 10 6 )
Gt gigatonnes (1 tonne x 10 9 )
Coal tce tonne of coal equivalent
Area ha/yr hectare per year
Gha giga-hectare (1 hectare x 10 9 )
Fuel Definitions
Biodiesel
Biodiesel is a diesel-equivalent, processed fuel made from the transesterification
(a chemical process which removes the glycerine from the oil) of both vegetable
oils and animal fats.
Biogas
A mixture of methane and carbon dioxide produced by bacterial degradation
of organic matter in a limited amount of oxygen known as anaerobic digestion.
Biomass and Waste
Solid biomass and animal products, gas and liquids derived from biomass and
the renewable part of municipal waste.
Brown Coal
Includes sub-bituminous coal and lignite where sub-bituminous coal is defined
as non-agglomerating coal with a gross calorific value between 4 165 kcal/kg
and 5 700 kcal/kg, and lignite is defined as non-agglomerating coal with a gross
calorific value less than 4 165 kcal/kg.
Clean Coal Technologies (CCTs)
Clean coal technologies are designed to enhance the efficiency and the
environmental acceptability of coal extraction, preparation and use.
Coal
Coal includes both primary coal (including hard coal and lignite) and derived
fuels (including patent fuel, brown-coal briquettes, coke-oven coke, gas coke,
coke-oven gas and blast-furnace gas). Peat is also included in this category.
Condensates
Condensates are liquid hydrocarbon mixtures recovered from non-associated
gas reservoirs. They are composed of C 4 and higher carbon number
hydrocarbons and normally have an API between 50° and 85°.
574 World Energy Outlook 2006
© OECD/IEA, 2007