German transmission grid operators TransnetBW and TenneT have awarded contracts worth €1bn and €800m to NKT and Prysmian, respectively, for the €10bn SuedLink Corridor, which is touted to be the largest underground cable project in Germany.

Under the contract, NKT will supply and install one of two high-voltage DC onshore cables with a route length of around 750km for the German SuedLink corridor.

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The scope of the contract includes a specially engineered solution for the power cable to cross the Elbe River and a salt mine.

NKT plans to start production early 2022 at its plants in Cologne, Germany, and in Karlskrona, Sweden.

NKT president and CEO Alexander Kara said: “Our power cable systems will ensure that wind and hydro power can be transported all the way from the North Sea and Norway via the NordLink and SuedLink interconnectors to Southern Germany.”

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Additionally, Prysmian will design, manufacture, supply, lay, joint, test and commission the second 2GW underground cable system from North to South Germany for the project.

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The 700km-long cable will run from Wilster in Schleswig-Holstein, to the north-west of Hamburg, to the southern connection point at Bergrheinfeld, close to Schweinfurt in Bavaria.

Prysmian Project BU executive vice-president Hakan Ozmen said: “With SuedLink, Prysmian extends its involvement in strategic underground interconnection projects creating increasingly efficient and sustainable power transmission grids.

“Alongside the trust placed in us with the German DC Corridors, we can point to our positive commitments on other long high-power land projects, such as the Piedmont-Savoy connection, the INELFE link, as well as the ElecLink and the ALEGrO projects.”

The SuedLink will have the capacity to carry renewable power from northern Germany to the southern states of Bavaria and Baden-Wuerttemberg.

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SuedLink Corridor is Germany’s largest-ever underground cable project. (Credit: NKT A/S/TenneT)