Nuclear
Asia-Pacific Economic Cooperation (APEC)

European Commission - Eurostat
Nuclear energy is recorded as the heat generated in nuclear power plants as a result of fission of the nuclear fuel inside the reactor.

International Energy Agency (IEA)
Energy released by nuclear fission or nuclear fusion.

Latin American Energy Organization (OLADE)
This energy is obtained from the mineral uranium following a purification and/or enrichment process. What is considered primary energy as “nuclear fuels” is not the mineral uranium in and of itself, but the contents of the fissionable material that is what feeds the nuclear plants.

United Nations Economic Commission for Europe (UNECE)
Energy released by nuclear fission or nuclear fusion.