The following definitions reflect those used by the International Energy Agency (IEA); definitions used by other organisations and publications may vary.
transmission and distribution (of electricity)
tertiary amyl methyl ether
Energy Training & Capacity Building Programme (of the IEA)
total final consumption
tradable green certificate
total primary energy demand
total primary energy supply
(two definitions) the process of converting scientific findings from research laboratories into useful products by the private sector; second definition is used more in economic development literature and involves cross-border transmission of technology from one country to another.
the sum of consumption by the different end-use sectors. TFC is broken down into energy demand in the following sectors: industry, transport, buildings (including residential and services) and other (including agriculture and non-energy use). It excludes international marine and aviation bunkers, except at world level where it is included in the transport sector.
represents domestic demand only and is broken down into power generation, other energy sector and total final consumption.
equivalent to total primary energy demand. TPES represents inland demand only and, except for world energy demand, excludes international marine and aviation bunkers.
the use of fuelwood, charcoal, animal dung and agricultural residues in stoves with very low efficiencies.
refers under IEA statistical purposes to fuels and electricity used in the transport of goods or persons within the national territory irrespective of the economic sector within which the activity occurs. This includes fuel and electricity delivered to vehicles using public roads or for use in rail vehicles; fuel delivered to vessels for domestic navigation; fuel delivered to aircraft for domestic aviation; and energy consumed in the delivery of fuels through pipelines. Fuel delivered to international marine and aviation bunkers is presented only at the world level and is excluded from the transport sector at the domestic level.
tonne = metric tonne = 1 000 kg
tonnes per year
thousand cubic feet
trillion cubic metres