Norway’s Boa Marine Services’ AHTS/ROV vessel ‘Boa Bison’ has wrapped up its work at the Fecamp wind farm.
The vessel was chartered by MT Højgaard to support the installation project.
MT Højgaard lowered the Seatower Cranefree® foundation to a depth of nearly 30 metres on the seabed of the English Channel, off the French town of Fécamp on the Normandy coast.
Boa Bison was hired to prelay the anchors for a gravity base structure and ROV work during submerging.
The Operation
The foundation was lowered by filling seawater into ballast tanks on the foundation. Prior to lowering the foundation, the seabed was prepared by establishing a level layer of filter stones. MT Højgaard used tugs to transport the 1,760-ton foundation and met mast from Le Havre harbour to the installation site approximately 17km off the coast.
The foundation was designed by Seatower and manufactured by Eiffage TP in France, while MT Højgaard performed the installation. The prototype foundation is part of a development project in connection with the planned offshore wind farm “Parc éolien en mer de Fécamp” in France, owned by the French energy company EDF Energies Nouvelles, Danish-based DONG Energy and German-based wpd Offshore.