Energy Island
The 17th caisson for the Princess Elisabeth Island has been installed in the North Sea.
Each caisson installed brings us closer to completing this pioneering artificial energy island, located 45 km off the Belgian coast. This could be delivered through the strong collaboration between DEME Group and Jan De Nul Group (TM Edison) on behalf of Elia Belgium.
Developed by Belgium grid operator Elia Group, Princess Elisabeth Island will serve as a key connection point for transporting electricity generated by future offshore wind farms in the Princess Elisabeth Zone to the mainland.
The installation of the caissons, massive concrete structures that will form the outer walls of the island, started in April 2025, with the first campaign completed in October 2025. The work resumed this spring.
Each of the caissons weighs approximately 22,000 tonnes and measures 58 metres in length, 28 metres in width, and between 23 metres and 32 metres in height, depending on the presence of a storm wall.
