The foundation is a cylindrical steel structure with an open base that is sucked into a soft sand bed with pumps. Friction between the subsoil and bucket wall ensures stability after installation. Suction buckets are common for offshore structures, but the size of this one is unique, since it was made to support a wind turbine considerably larger and heavier than installed offshore previously.
A Danish company with years of offshore construction experience, Marine Business Development (MBD), designed the bucket. The concept has been tested successfully with a Vestas 3 MW machine installed on reclaimed land just inside the harbour wall at Frederikshavn, Denmark. Construction and installation of the foundation is handled by Danish BLADT Industries, specialised in manufacturing large, complex steel structures.