Monopile installation completed at Arcadis Ost 1 offshore wind farm

July 26, 2022
DEME Offshore installed its final XXL monopile at Parkwind’s Arcadis Ost 1 offshore wind farm in the Baltic Sea off the coast of Rügen.

Offshore staff

A major milestone was achieved at Parkwind’s Arcadis Ost 1 offshore wind farm over the weekend when DEME Offshore installed its final XXL monopile in the Baltic Sea off the coast of Rügen. This was the first project executed by DEME’s new floating installation vessel Orion, which installed the foundations using its DP3 system.

The 28 XXL monopiles are the largest monopile foundations installed, weighing more than 2,000 tonnes each, and having a diameter of 9.5 m and a length of up to 110 m.

Parkwind’s Arcadis Ost 1 project in the Baltic Sea is located northeast of the Kap Arkona Cliffs, within the 12 NM Zone of Germany with water depths of up to 45 m and challenging soil conditions. It will get its 27 Vestas V 174 – 9,5 MW wind turbines later this year and produce green electricity to supply up to 290,000 households.

Orion was running on LNG during the installation campaign and is equipped with a 5,000-tonne crane and a motion-compensated pile gripper system able to handle large XXL monopile foundations. The integrated motion-compensated pile gripper tool enables the crew to upend and drive the monopiles, which are transported horizontally on deck. Coupled with the vessel’s DP3 capability, the motion-compensated gripper keeps the monopiles vertical and stable despite waves and vessel motions.

In addition, an entire set of new specialist tools have been used during this maiden project for Orion. These tools include an adjustable monopile sea fastening system, a newly built automated monopile lifting spreader beam to enable the horizontal lifting of the XXL monopiles, automated quick-lifting tools to avoid manual handling on deck as well as several new noise mitigation systems.

Arcadis Ost 1 is a 257-MW offshore wind farm developed in the German territorial waters of the Baltic Sea, northeast of the island of Rügen. Arcadis Ost 1 has been developed by Parkwind with the participation of PMV and OstseeWindEnergie GmbH, a project company of the three partners Oberhessische Versorgungsbetriebe AG, Stadtwerke Bad Vilbel and WV Energie AG. The wind farm will begin operations in 2023.