The term “energy mix ” refers to the combination of the various primary energy sources used to meet energy needs in a given geographic region. It includes fossil fuels (oil, natural gas and coal ), nuclear energy and the many sources of renewable energy (wood and other bioenergies, hydro, wind, solar and geothermal ). These primary energy sources are used, for example, for generating power , providing fuel for transportation and heating and cooling residential and industrial buildings (https://www.planete-energies.com/en/medias/close/what-energy-mix) .

The composition of the energy mix varies greatly from one country or region to the next and can change significantly depending on the period.