These industries correspond to code EG of the NES classification, the summary economic classification which was in use until december 2007 :
- production of fuels (extraction of fossil coal, lignite and peat, extraction of hydrocarbons, extraction of uranium ore, coking and nuclear industry, petroleum refining) ;
- water, gas, electricity (production and distribution of electricity, gas and heat, collection, treatment and distribution of water).
There is no such grouping in NA, the agregated economic classification which replaced NES since 2008. The precise perimeter of energy in each statistical operation is given by the list of the items taken into account in the economic classification to which the operation refers.