La part relative des coûts de transport et de distribution, ainsi que les niveaux absolus, varient énormément d'un État membre à l'autre, pour des raisons qui ne sont pas toujours faciles à comprendre.
The relative share of transmission and distribution costs, as well as the absolute levels, vary greatly across Member States, for reasons that are not always easy to understand; data on the drivers of these shares and their evolution is scarce, in particular for gas.