Kilogram oil equivalent en
Kilogram of oil equivalent is a normalised unit of energy. By convention it is equivalent to the approximate amount of energy that can be extracted from one kilogram of crude oil. It is a standardised unit, assigned a net calorific value of 41 868 kilojoules/kg and may be used to compare the energy from different sources. Other energy carriers can be converted into kilograms of oil equivalent by the use of conversion factors. Wikipedia [ - ]