Final monopile installed at Arcadis Ost 1 wind farm

4C Offshore | Tom Russell
By: 26/07/2022 DEME Group

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

Every element of this offshore wind project pushes the limits of industry standards. The 28 XXL monopiles are the largest monopile foundations ever installed, weighing more than 2,000 tonnes each, and having a diameter of 9.5 m and a length of up to 110 m. The project is situated in the Baltic Sea is located North-East of the famous Kap Arkona Cliffs, within the 12 NM Zone of Germany with water depths of up to 45 m and challenging soil conditions.

Orion was running on LNG during the installation campaign and is equipped with a 5,000-tonne crane and a tailor-made, motion compensated pile gripper system designed to handle 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.

Hugo Bouvy, Managing Director of DEME Offshore, said: “We are extremely thrilled to see ‘Orion’ and her motion compensated pile gripper doing what the vessel has been created for, installing huge monopiles in extreme circumstances. This pushes the boundaries of the offshore wind industry over the horizon and shows that DEME’s smart solutions and equipment are ready for the next generation of foundations and wind turbines. Many years of offshore experience and engineering by incredibly motivated people have resulted in the delivery of ‘Orion’ and her installation tools. Our persistent Arcadis Ost 1 project and newbuild teams, and our experienced and extremely professional crew led to the commissioning of ‘Orion’ in record times. Together they pushed technological boundaries with enormous enthusiasm and drive. I am so proud to be part of this team!”

Manfred Dittmer, Parkwind’s Country Manager for Germany, commented: “It feels good to see how it all comes together when installation works starts, the planning, the design, the certification, the manufacturing, and finally the installation itself. Thanks to the whole team and all partners involved who worked with great efforts and enthusiasm on the realisation of our first offshore wind farm outside Belgium. It underlines our capabilities to execute projects under challenging conditions and environments. With the monopiles in place, we will continuing the installation of the secondary steel structures to complete the foundations.”

Arcadis Ost 1 wind farm will have a capacity of about 257 MW and is located in the Baltic Sea, 19 km north-east of the island of Rügen, within the 12 nautical mile zone of the Federal State Mecklenburg-Western Pomerania, Germany. It is being developed by Parkwind with the participation of PMV and Ostsee WindEnergie GmbH, a project company of the three partners Oberhessische Versorgungsbetriebe AG, Stadtwerke Bad Vilbel and WV Energie AG. Offshore installation works are expected to start works in 2022. It is expected to be operational in 2023, and will be capable of generating enough green electricity for the annual power consumption of more than 290,000 homes.

For more information on offshore wind farms worldwide, click here.