Like any transmission system operator (TSO), TransnetBW, the TSCNET shareholder from the southwest of Germany, regularly evaluates the condition of its facilities and transmission infrastructure to define necessary modernisation measures. This has revealed the need to renew the 380kV overhead line from Herbertingen in the south of the federal state of Baden-Württemberg to the Hoheneck substation in Ludwigsburg, about 20 kilometres north of the Swabian metropolitan city of Stuttgart. As part of the modernisation, several steel parts of 53 existing pylons will be replaced. The basic mast structure, that is height, width, and foundations, is not affected.
For the work on the line in the voltage range of the mast cantilever arms, disconnection of the corresponding electrical circuits is required. This has no effect on the regional power supply. Work on the roughly 120-kilometre-long transmission line began in the last week of September and is expected to be completed by the end of November 2020.