TM Edison, a consortium of Belgian marine construction companies DEME and Jan De Nul, has installed the first two of a total 23 caissons in the Belgian North Sea…
TM Edison, a consortium of Belgian marine construction companies DEME and Jan De Nul, ha installed the first two of a total 23 caissons in the Belgian North Sea, marking the start of construction for the Princess Elisabeth Island, the ‘world’s first’ artificial energy island.
Caissons are concrete building blocks that form the outline of the future island. In a later phase, the interior will be filled with sand to build high-voltage infrastructure that will connect new offshore wind farms.
TM Edison is carrying out the work on behalf of grid operator Elia Transmission Belgium (Elia). In the coming decades, the energy island will become an essential part of Belgium’s electricity supply.
The transport and installation of the caissons at sea is a technically complex operation that began on April 21, 2025. Each caisson weighs approximately 22,000 tons and measures 58 meters in length, 28 meters in width, and between 23 and 32 meters in height, depending on the presence of a storm wall.
For the transport from the port of Vlissingen - where they are built - four powerful tugboats are used to tow each caisson via the Western Scheldt and the North Sea to the island site, covering a
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