About us

Cadeler has been in charge of the transportation and installation (T&I) of all 139 Siemens Gamesa 11 MW wind turbines at the Hollandse Kust Zuid wind farm in the Netherlands.

Upon completion in June 2023, the wind farm took the record as the world’s largest single offshore wind farm with a capacity of 1.5 GW. It also took the record as the first ever to be built without subsidies. Today, the wind farm is producing enough renewable energy to power more than 1.5 million Dutch households a year.

When our team of engineers started to plan for this project years ago, it was the first time ever that these giant 11 MW wind turbines were to be installed on a commercial scale. This required skillful engineering work and a good collaboration between engineers from Vattenfall, Siemens Gamesa and Cadeler. The team managed to come up with the best possible solution to successfully carry more components at each load-out, while keeping within the maximum utilization of the vessel and prove the concept for future projects.

The team onboard Wind Osprey were able to install an 11MW offshore wind turbine in less than 24 hours.

Wind Osprey was deployed in this project. Load out port was Port of Rotterdam. Clients were Siemens Gamesa and Vattenfall.

Wind Osprey was contracted to transport and install 42 11 MW Siemens Gamesa offshore wind turbines for the Hollandse Kust Noord off the coast of The Netherlands from June 10 to October 20 2023 right after completing the work on Hollandse Kust Zuid. The installation was completed within the agreed timeframe.

If the weather permits, the team onboard Wind Osprey were able to install such an 11 MW offshore wind turbine in less than 24 hours.

Load out port was Eemshaven.

Cadeler secured the full installation scope of all 114 Vestas V164-10.0MW turbine generators (WTGs) at the Seagreen offshore wind farm in Scotland. When the wind farm was completed in June 2023, it took the record as Scotland’s largest and the world’s deepest fixed bottom offshore wind farm.

During this project, we installed some of the deepest fixed wind turbines that we have ever installed in the history of Cadeler. On 25 locations the water depth exceeded 55 metres with the deepest installed having a water depth of an impressive 59 metres.

These deep locations have been an area of focus since the early preparation days in 2019. A result of many hours of well-researched location specific engineering, planning, and of course the good collaboration between Cadeler, Vestas, SSE Renewables and TotalEnergies.

Today, the Seagreen offshore wind farm is making an impactful contribution to the green transition in the UK where it generates around 5,000 GWh a year, enough to power more than 1.6 million homes with green and clean energy.

The 1.075MW wind farm is owned by TotalEnergies and SSE Renewables. It is located off the coast of Angus in the North Sea. Wind Orca was deployed for this installation and load out port was Port of Nigg.

Cadeler executed the transportation and installation for DEME of 90 Vestas 9.5GW wind turbine generators (WTGs) for the 857 MW wind farm situated off the coast of Lincolnshire in the North Sea, United Kingdom. Today, the Triton Knoll wind farm provides enough renewable energy to power at least 800.000 UK households. The wind farm was completed in November 2021. Wind Osprey was deployed as wind installation vessel and the load out port was Able Seaton Port.

Installation of 114 monopile foundations at Ørsted’s Hornsea 2 offshore wind farm off the coast of Yorkshire, United Kingdom. The 1.3 GW wind farm was completed and ready to operate in August 2022. The wind farm spans an area of 462 square kilometres and powers more than 1.4 million UK homes with green, renewable energy. Wind Orca was deployed as wind installation vessel and the load out port was Port of Hull.

Wind Orca was contracted for an O&M job for Siemens Gamesa Renewable Energy for the provision of maintenance and main component exchanges for 70 turbines of various models. The work started in the middle of 2019 and finished in December 2020.

In September 2020, Wind Osprey served as offshore accommodation during works on the DolWin Gamma converter platform in Germany. The client was GE Grid Gmbh.

Cadeler executed the transportation and installation of 84 Siemens Gamesa SWT-7.0-154 WTGs at the Beatrice offshore wind farm in Moray Firth in the UK. The 588 MW wind farm was completed in 2019 and characterized by its deep-water installations with water depths of up to 55 metres. The load out port was Port of Nigg in Scotland and Wind Orca was deployed as T&I vessel.

Monopile foundations and Transition Piece Installations for GeoSea in Germany. The site is situated approximately 90 kilometres north of Borkum Island in waters up to 40 metres deep. Wind Osprey was used as the installation vessel in charge of 63 installations. Eemshaven Port in the Netherlands was used as load out port. The wind farm was completed in 2018 and has a capacity of 441 MW.

Cadeler managed the 288MW project, installing 80 monopiles & 80 TPs and installation of 80 3.6 MW Siemens turbines, including scour protection, noise mitigation and grouting.

Leviathan and Wind Zaratan worked year-round to ensure the installation was achieved in the best possible time. Construction was completed in April 2014 and was labelled as a “benchmark for future German projects”.

Wind Zaratan completed hammering of 80 monopile foundations at the Meerwind Offshore Wind Park in Germany.

In 2018, Cadeler's Wind Orca executed the installation of 11 WTGs with capacities of 8.4MW and 8.8MW at the 93.2 MW wind farm situated about three kilometres east of the Scottish coast. The client was Boskalis with Vattenfall as the developer. The project was characterized by deep water installations of 19-32 metres with one site having a 20+ metres leg penetration. The load out port was Port of Esbjerg. At the time of installation, the 8.8MW turbines were the world’s most powerful offshore wind turbines.

Wind Osprey supported the wind farm project with accommodation during works on the site’s offshore substation. The client was E.ON Renewables and the project was completed in 2017.

The installation of 47 monopiles and transition pieces for client E.ON Climate and Renewables UK. The Rampion offshore wind farm was completed in 2016 with a capacity of 162 MW. It is situated 13-20 kilometres off the coast of England in the English Channel characterized by water depths of 19-40 metres. Wind Orca was deployed in this project and the load out port was Vlissingen in the Netherlands.

Cadeler and Wind Orca executed the installation for Siemens Gamesa of 40 WTGs (SWT-6.3-154) at the Galloper offshore wind farm situated about 30 km off the coast of England. Installations took place at water depths of 27-36 metres. Load out port was Great Yarmouth, United Kingdom. The wind farm was completed in 2017 and has a capacity of 252MW.

Monopile foundations and transition piece installations for Bilfinger GmbH with Vattenfall as the end client. Wind Orca was deployed as the installation vessel for the 72 installations. The load out port was Port of Esbjerg, Denmark. The 288 MW Sandbank wind farm was completed in 2016 and is situated in the North Sea about 90 kilometres off the German coast.

Wind Osprey was chartered to install 72 of 150 SWT-4.0-120 turbines in the Dutch waters of the North Sea for Van Oord in 2016. The load out port was Esbjerg Port, Denmark and water depths at installation site was up to 36 metres. The wind farm has a capacity of 288 MW.

Wind Osprey was chartered by Van Oord to install 76 of 150 monopile foundations at the 304 MW Gemini offshore wind farm in the North Sea with monopile weights exceeding 900 tonnes and water depths up to 36 metres. The project was completed in 2015 and the load out port was Port of Esbjerg, Denmark.

Wind Orca was chartered for the disassembly of two met masts in the Dogger Bank Field which required transport to shore for repairs. The vessel returned to the site in 2015 to reinstall the met masts. The project was situated 125 to 290 kilometres off the Yorkshire coast in water depths ranging from 22 to 25 metres. Client was Fred. Olsen Windcarrier Ltd. Load out port was Port of Esbjerg, Denmark.

Wind Orca was chartered for the disassembly of two met masts in the Dogger Bank Field which required transport to shore for repairs. The met masts were dismantled in two sections and fit easily on Wind Orca’s deck, making only a single trip to Dogger Bank necessary. Additionally, Wind Orca’s 6-leg design helped mitigate the risk of vessel instability on a site where leg penetration of up to 25 metres was possible during jacking operations.

The project was completed in 2014. It was situated 125 to 290 kilometres off the Yorkshire coast in water depths ranging from 22 to 25 metres. Client was Fred. Olsen Windcarrier Ltd. Load out port was Port of Esbjerg, Denmark.

In 2014, Wind Orca provided accommodation support during works on the Helwin Alpha offshore substation. The OSS serves as the connection point between the Nordsee Ost and Meerwind Süd/Ost Offshore Wind Farms and the German coast.

O&M campaign of 11 turbines serviced (blade exchange, servicing of yaws, blades and main bearings). The work was completed in 2014 by Wind Osprey and took place at Walney, Burbo Banks, Rhyl Flats, Lincs offshore wind farms. All of them located in the Irish Sea Country, United Kingdom.

In 2014, Wind Osprey was chartered to install 80 SWT-3.6-120 turbines immediately south of the German-Danish international border in the North Sea. The client was DanTysk Offshore Wind GmbH and the load out port was Port of Esbjerg, Denmark. The site was situated 70 kilometres west of the Island of Sylt in water depths of 31 metres. The capacity of the wind farm is 288 MW.

Wind Orca was chartered by Ørsted to transport and install 77 fully grouted connection monopile and transition piece foundations in the German North Sea. Additionally, the vessel completed the transport and installation of a suction bucket jacket on a pilot project. The monopiles weighed in excess of 500 tonnes, were an average of 55 metres in length and supported 77 Siemens 3.6MW turbines adding 277.2 MW of offshore wind capacity.
During its quickest load out, the vessel reached an average of 23 hours per location including installation, jacking and transit times. The project took place in 2014 and load out port was Eemshaven Port, Netherlands. The site was located 55 kilometres from shore in water depths of 23-28 metres.

CAT Structure installation

Wind Scylla was contracted to accelerate installation of WTGs alongside Fred.Olsen Bold Tern.

Originally contracted for 105 days, the contract was extended to 162 days with Wind Scylla replacing the Bold Tern. During the firm period 47 x Siemens 6MW WTGs were installed. The site was commissioned 4 months ahead of schedule and delivered well within the CAPEX budget.

Installation of 31 monopile foundations and transition pieces.

4 x V164-9.5 MW turbine installation.

Wind Scylla was brought in to increase the pace of installation in parallel with the Vole au Vent in March 2020.

Cadeler’s first foundation installation project! In 2013, Wind Orca was chartered by Ørsted and Scottish Power to install 78 of 108 foundations at the site in the eastern Irish Sea 15 km off the coast of England at water depths of 25 metres. Each monopile supports a Siemens 3.6 MW turbine. The largest monopiles used on site weighed approximately 500 tonnes and reached lengths of up to 60 metres. The fastest installation time was 8 hours and 8 minutes for completion of both the monopile and transition piece. The load out port was Belfast Port in the UK and the completed wind farm had a capacity of 280.8 MW.

An O&M project for Vattenfall servicing the Horns Rev 1 offshore wind farm in Denmark situated 14 kilometres west of Jutland’s coast. Three turbines were serviced by Wind Orca and crew. All of them gearbox exchanges.

100 x 9.5MW WTG Installation

Despite the challenges due to the COVID pandemic, Wind Scylla managed to operate efficiently on the Moray East Offshore Wind Farm. The wind farm can supply 950,000 homes in the UK with electricity.

Located 22km from shore with water depths between 38 - 56 metres.

In 2013, Wind Osprey was chartered by Siemens to service eight WTGs with gearbox exchanges, servicing of yaws and main bearings. The Walney and Burbo Banks offshore wind farms are located in the Irish Sea, United Kingdom.

Cadeler’s first jacket installation. In 2013, Cadeler transported and installed a jacket foundation for the Belwind Alstom demonstration project 45 km off the coast of Belgium in 34 metres waters. The foundation supported the test turbine, a GE Haliade 6 MW and the load out port was Ostend, Belgium.

Installed 97 WTGs (Siemens 3.6MW)

Originally contracted for 122 days, Wind Scylla completed the installation of 40 x MHI Vestas 8.25MW WTGs in 102 days.

In addition, Wind Scylla was brought in to complete installation of 47 x Siemens Gamesa 7 MW WTGs. Originally contracted for 124 days, the installation was completed in 116 days.

• Installed 28 WTGs (Siemens 3.6MW)
• O&M Support

Wind Zaratan performed main bearing replacements as part of the operations and maintenance scope. 

• Installed 9 TPs
• Installed 105 WTGs (Siemens 3.6MW)
• Installed met mast

Installation of 20 x Siemens Gamesa SWT-6.0-154 WTGs.

Water depths between 15 - 30 metres, up to six kilometres off the coast of Miaoli County in north-west Taiwan. Undertook liquefaction analysis (due to high seismic risk in the region) to achieve a certificate of approval for jacking activities. Formosa Phase 2 was a key development for the state as it moves away from traditional power sources towards renewable energy.

Installed 81 Siemens 8MW WTGs.

Operating out of Taichung Port, the site is located 35-50km off the coast of Changhua County. The wind farm can create enough energy to supply around 1 million Taiwanese households with renewable power.

Installation of 33 x foundations, Wind Turbines, Scour Protection & Management of Piling Noise Mitigation Methods.

The project, which is owned by Akita Offshore Wind Corporation (AOW), is the first commercial-scale fixed-bottom wind farm to be constructed in Japan.  The 140MW project will power approximately 150,000 homes and mitigate over two million tons of GHG emissions over its expected useful life.

Wind Zaratan completed the installation of 33 monopiles and transition pieces off the Akita Prefecture coastline.

The project which is owned by Akita Offshore Wind (AOW) is the first commercial size fixed bottom wind farm to be constructed in Japan and on completion will provide around 140MW of renewable energy. Despite  challenges of changing Wind Zaratan to Japanese Flag, the impact of the global Covid-19 pandemic and mitigation measures required to operate a jack up vessel in this seismic region, the project has completed within a few weeks of the original planned end date.

18 x 8MW WTG installed in 2023. Planned 35 x 8MW WTG installation for completion Q3 2024.

2 installations per trip, 8 km west of the coast of Yunlin County.