Distribution Losses
Asia-Pacific Economic Cooperation (APEC)

European Commission - Eurostat
Distribution losses consist of losses due to transport or distribution of electricital energy, heat, natural gas and derived gases. It also includes flaring of manufactured gases as well as pipeline losses.

International Energy Agency (IEA)
Distribution losses includes losses in gas distribution, electricity transmission and coal transport. It also includes flaring of manufactured gases as well as pipeline losses.

Latin American Energy Organization (OLADE)
Losses occur during activities carried out from when energy is produced until it reaches the final consumer. They include, among others, losses during extraction, storage, transportation, transmission, distribution, etc. Loss is different from unused, because while the latter may be completely used under the right conditions, the former can only be reduced through conservation.

Losses of Primary and Secondary Products is valid for all primary and secondary sources. You only need consider transportation and distribution losses.

The most important case is that of Electricity, where you should enter losses from the interconnected system supplied by the companies, which are generally determined by the difference between produced and billed. In the case of fraudulent energy use, its amount appears in consequence within the loss.
For hydropower, losses are defined as evaporation plus filtration. For solid and liquid fuels, losses are much smaller than for power, and it is usual to estimate them as a percentage (0.5 a 1.5 %) of demand.

United Nations Economic Commission for Europe (UNECE)
Distribution losses includes losses in gas distribution, electricity transmission and coal transport. It also includes flaring of manufactured gases as well as pipeline losses.

UNSD Energy Statistics Section
Losses in transport and distribution refer to the losses of fuels and electrical energy which occur outside the utilities or plants before reaching the final consumer.