Annual regional lengths of electricity transmission network circuits and tower queues

This dataset presents the lengths of circuits and queues of pylons in operation of the annual electricity transmission network on 31 December since 2011: * By region * Per voltage level (45 kV, 63 kV, 90 kV, 150 kV, 225 kV, 400 kV, CONTINUOUS CURRENT) * And by type of installation (air, underground, submerged) The voltage level 45 kV corresponds to a voltage level less than or equal to 45 kV. Distinction between circuit and lane of pylons: * In case 2 circuits are carried a queue of pylons, the length is counted only once * On the other hand, the length is counted 2 times if we take into account the lengths of circuits. Thus, the lengths of pylons are always less than the lengths of circuits. In the absence of pylons, underground and submerged laying types are not affected by pylon queue lengths (empty value in the dataset).