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Substation Hessenberg

The Hessenberg substation forms part of the southern region and operates at the high-voltage level of 220 kV. The substation acts as a base for the maintenance personnel working on the substations in Hessenberg, Kainachtal, Weißenbach, Oststeiermark, Zeltweg and Mellach as well as for the southern overhead line team.  The 220-kV outdoor switching station is located on a 7-hectare site which also houses operational building facilities with emergency power supply equipment. 

The substation is situated within the municipal area of St. Peter-Freienstein (close to Leoben) and was constructed between 1940 and 1943 and has been upgraded several times in the years since. Due to its age, the 110-kV outdoor switching station was dismantled in 2019 and a new 110-kV gas-insulated switching station was constructed in its place and brought into service by Energienetze Steiermark. 

The substation is responsible for distributing electrical power from Austria’s trans-regional transmission grid in line with demand as well as supplying and supporting the regional distribution grids.  

The southern overhead line team is in charge of managing the high-voltage overhead lines in the region, ensuring that they are operating properly as well as carrying out maintenance work and remedying any faults.

Substation Hessenberg

Werk Hessenberg 11 
8792 St. Peter-Freienstein, Austria



The Hessenberg site regularly trains apprentices as technicians as part of a combined electrical engineering/metalworking programme. The apprenticeship lasts four years.


Apprenticeship in Hessenberg

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