The terajoule model is a takes a granular approach to modelling the EU energy mix. This topology is most similar to the NUTS2(Nomenclature des Unités territoriales statistiques) region, which is a geographical system, according to which the territory of the European Union is divided into hierarchical levels. The three hierarchical levels are known as NUTS-1, NUTS-2 and NUTS-3. This classification enables cross-border statistical comparisons at various regional levels within the EU.