TenneT, Netherland’s transmission system operator (TSO), has commissioned NKT, Nexans and a consortium of LS Cable, Jan De Nul and Denys to supply and lay some 7,000 km of power cable for offshore and onshore use that is valued at some €5.5 billion.

A press release said that TenneT, which serves as TSO for the Netherlands, and a significant part of Germany, owns and operates over 25,000 km of H-V lines and cables. It is now expanding that scope through 525 kV direct current cable systems for corresponding grid expansion projects. The company is completing the major tenders for grid connection systems that it started last year with this second framework agreement. These include 14 offshore connections, five of which had already been commissioned by the Dutch at the beginning of
2023, and one direct current project on land. The breakdowns for the orders are as follows.

NKT. The company will be responsible for connections for Nederwiek 3 in Geertruidenberg or Moerdijk, and Doordewind 1 and Doordewind 2, in Eemshaven. The order includes approximately 100 km of onshore cables as well as 300 km offshore cables divided into three onshore and two offshore sections to avoid cable laying in the submarine Capbreton Canyon. NKT will produce the power cables at the high-voltage factory in Karlskrona, Sweden, with expected commissioning of the full project by 2028.

Nexans. The company has received the order for the cable of the offshore projects BalWin3 and LanWin4 to be connected in Wilhelmshaven, as well as that of LanWin2, which leads to the Heide area in Schleswig-Holstein.

LS Cable consortium. The consortium of LS Cable, Jan De Nul, and Denys will be responsible for the other cable systems for the projects in Lower Saxony. These include BalWin4 and LanWin1, both of which are to be connected in the Unterweser area. The portfolio also includes LanWin5, which has its onshore network connection point in the Rastede area. The consortium has also been awarded the contract for the TenneT-side part of the 525 kV onshore DC project NordOstLink in Schleswig-Holstein. NordOstLink is a TenneT partner project with the transmission system operator 50Hertz.

The collective scope of the contracts includes cable design and engineering, production, delivery, project management and subsequent onshore and offshore laying of the 525 kV DC cables. Work will start in 2023, with onshore cable laying after 2025. At sea, cable-laying work is expected to begin in 2026. The offshore projects, each with a transmission capacity of 2 gigawatts, are expected to be operational by 2031 and NordOstLink by 2032.

TenneT COO Tim Meyerjürgens said that the project is an essential step for energy transition. “Together, with this award alone, we will implement around 7,000 km of DC cable for onshore and offshore grid connection systems in Germany and the Netherlands by 2032.” Each 2GW cable system will have a positive and negative conductor, a metallic return conductor and a fiber optic cable.