With 105,857 km of lines in service, the transmission network continues to guarantee security of supply in the territories and regions while facilitating and supporting the accommodation of renewable generation.
Highlights of 2018 included the completion of the “2 Loires” project (restructuring of power supply between Le Puy-en-Velay and St-Etienne), the creation of a 225/63 kV substation in Saône (to secure the supply of electricity to the Besançon area), and the start of work on the terrestrial portion of “IFA2” (new interconnector between France and England).
New underground lines (newly created or overhead lines newly undergrounded) totalled 223 km, while 588 km of overhead lines were taken down (permanently or to be replaced) during the year.
All in all, the length of the network decreased by 104 km year-on-year in 2018.
|Length of lines in service (km)||Overhead||Underground||Total|
|At 31 December 2017||99,964||5,997||105,961|
|Overhead lines buried||0||19||19|
|Other (placed in reserve, length adjustments…)||-267||-26||-293|
|At 31 December 2018||99 655||6 202||105 857|
The total length of underground lines in service ended the year at 6,202 km, topping the 6,000 km mark for the first time.
At the same time, the total length of overhead lines on the transmission network continued to decrease, falling to 99,655 km.