Energy Island in the North Sea
WODCON XXIII - Dredging is changing - The Practice. The Science. The Business.
J. Juhl, A. Kristensen
"The Danish Parliament has agreed to initiate the realization of an artificial island to realise 10GW of offshore wind potential from the North Sea. The Energy Island is seen as the beginning of a new era for future development of Danish offshore wind and a cornerstone in the green transition. The Energy Island is located in the North Sea, about 100 km from the west coast of Denmark. Initially, the island shall handle 3GW of offshore wind power, and eventually the island shall be able to receive and transmit up to 10 GW offshore wind power. The wind energy produced shall be used to accelerate the green transition with the energy island serving as a hub for transmitting the energy to where it can bring the most value. Compared to other artificial islands around the world, this is more challenging as the island is located in a water depth of about 25-30 m and in a harsh environment with extreme design waves. Further, it is even more challenging from a construction point of view as it is located far from the coast and with limited weather windows for the marine construction activities. We are working for a group of investors intending to bid for construction of the island and to become the Commercial Co-owner with the Danish State having a majority ownership. Pre-qualification and bidding are planned for 2022 and 2023. The perimeter protection of the island shall be able to resist extreme design waves and to ensure functionality of the island. The perimeter structures are likely to be either rock revetments protected by large concrete units or concrete caissons whatever will be optimal considering cost, time and risk. The island platform will be formed by sand likely dredged from borrow areas in that part of the North Sea."
Keywords: Energy island, artificial island, caisson, revetment, reclamation