DEME and Prysmian Start Cable Installation for Dutch Offshore Grid Connections

DEME and Prysmian have started installing high-voltage cables for grid operator TenneT in the Veerse Meer in the Netherlands, as part of the IJmuiden Ver Alpha and Nederwiek 1 grid connection projects.

Once connected, these cables will bring electricity from future offshore wind farms directly ashore.

The installation is carried out from a custom-built pontoon that DEME developed specifically for the conditions of the lake. The pontoons carry the cable carousels and specialized equipment to handle the high-voltage cables, spare cables, and fiber optics simultaneously.

To install the cables to the depth of at least three meters, a tailored vertical installation method is used in combination with high-pressure water jets to temporarily fluidize the sand beneath the cable. As the pontoon advances, the lakebed naturally settles back into place, minimizing water turbidity and any environmental impact.

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