The Hardegsen substation operated by TSCNET shareholder TenneT, the Dutch-German transmission system operator (TSO), is one of the central power hubs in the southern part of the German federal state of Lower Saxony. But the substation is also of supra-regional importance, as it will serve to connect the Wahle-Mecklar line currently under construction with the local distribution grids.
With a total length of 230 kilometres, the 380kV line from Wahle in Lower Saxony to Mecklar in the state of Hesse is one of the largest power line projects in Germany and belongs to those construction schemes that are essential for increasing the capacity to transmit green electricity from the main generation sites in the north to the consumption centres in the south of the country.
To meet regional and supra-regional uses, the 220kV station will be prepared for 380kV operation and equipped with a total of three transformers capable of spanning between the 380kV and 110kV levels and also between 220kV and 110kV. From 2 to 3 October 2018, the second 287-tonne transformer will be delivered to Hardegsen with a heavy-duty road transportation unit of around 53 metres in length and a total weight of 491 tonnes. The subsequent assembly of the 300MVA transformer at the substation is expected to take three months.