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December 15.2025
3 Minutes Read

Jan De Nul Completes Pivotal Cable Installation for TenneT's DolWin Project

DolWin cable installation vessel sailing offshore.

Jan De Nul Completes Key Cable Installation for Offshore Wind Initiative

Another milestone in the renewable energy sphere has been reached as Jan De Nul, the Belgian offshore contractor, finishes the vital cable installation at TenneT’s DolWin kappa platform. This project is not just about laying cables; it symbolizes progress in the transition to greener energy sources in Germany. The completion of these three high voltage alternating current (HVAC) cables will facilitate the movement of nearly 660 MW of renewable electricity, a capacity sufficient to power over 800,000 households in the country.

The Heart of the Project: Connecting Offshore Wind Farms

The project involved laying three 155 kV HVAC cables, spanning a total of 37 km. These cables create a crucial link between the Nordseecluster 1 and 2 offshore wind farms and the DolWin kappa converter station. This interconnection is a fundamental component of Germany's growing renewable energy infrastructure, allowing for efficient transmission from wind to grid.

Operation Details: Advanced Techniques in Submarine Cable Installation

Merging technology with expertise, cable-laying vessel Isaac Newton played a pivotal role in transporting the cables from Hellenic Cables’ facility in Greece. The project wasn’t merely about transport; it also included sophisticated installation techniques. For instance, at intersections with existing subsea infrastructure, the team deployed concrete mattresses for additional protection. Meanwhile, cable burial was conducted along proposed routes to safeguard the HVAC lines, which is critical for the long-term stability and functionality of the installation.

Environmental Considerations: Protecting Marine Ecosystems

As the maritime industry continuously seeks to mitigate ecological impacts, Jan De Nul deployed the multi-purpose vessel Adhémar de Saint-Venant to bury cables and minimize disruption to marine life. In addition, the protective measures included the installation of approximately 25,000 tonnes of rock berms using the rock installation vessel Simon Stevin, ensuring that the cables are secure and that the ecosystem remains protected.

Looking Ahead: The Future of Renewable Energy in Germany

The DolWin Kappa project is a pivotal part of TenneT’s ambitious HVDC DolWin6 initiative, which aims to connect new and existing offshore wind farms like Gode Wind 3 to the German onshore grid. The full capacity of the connected projects is expected to reach a staggering 900 MW, enough to supply more than 1.1 million homes with clean energy. Anticipated connection and testing activities slated for 2026 are crucial steps toward realizing this vision, along with the expected installation of two offshore substations for the wind farms.

A Collaborative Effort Toward Sustainable Energy

This project underscores the critical collaboration between Jan De Nul and Hellenic Cables as they work together to innovate, develop and install cutting-edge connections for offshore wind projects. Their combined expertise not only enhances the efficiency of existing infrastructures but also lays the foundation for future endeavors that target expanding renewable energy capacity.

In closing, the completion of the cables at DolWin kappa by Jan De Nul is not just a technical achievement; it is a commitment to sustainable energy solutions. As Europe navigates the shift toward green energy, projects like these serve as essential stepping stones toward a cleaner, more sustainable future.

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