North Sea cables installed at DolWin Kappa
Jan De Nul finishes 2025 installation of three HVAC cables, securing 660 MW of offshore wind power for 800,000 German homes.
Image for illustrative purposes
Germany, the North Sea: Jan De Nul has successfully wrapped up the 2025 transport and installation campaign for three HVAC grid connection cables at TenneT’s DolWin kappa platform. Once fully operational, these cables will transmit nearly 660 MW of renewable electricity from two offshore wind farms, enough to supply 800,000 German households.
Together with partner Hellenic Cables, Jan De Nul was responsible for the design, production, transport, installation, and protection of three 155 kV HVAC cables, stretching a total of 37 km. These cables provide a reliable link from the Nordseecluster 1 and 2 offshore wind farms to the DolWin kappa converter station.
The cable-laying vessel Isaac Newton carried the three 155 kV cables from Hellenic Cables’ submarine cable plant in Corinth, Greece, and installed them between DolWin kappa and the two offshore wind farm locations. Concrete mattresses were placed at subsea crossings to protect the cables. Meanwhile, the multi-purpose vessel Adhémar de Saint-Venant used its trencher UTV1200 to bury the cables along the entire route.
Over the past fortnight, the rock installation vessel Simon Stevin deployed around 25,000 t of rock berms to safeguard the HVAC interconnector cables on the seabed. These works mark the conclusion of the 2025 campaign at DolWin kappa.
Looking ahead, the final connection and testing procedures are scheduled for spring 2026, following the completion of the Nordseecluster 1 and 2 stations.
Source: OER International
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