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Wind farm Hollandse Kust Zuid Our Workhorse Designs Supporting Vattenfalls Sustainable Ambitions

InSide

A storytelling platform about our offshore challenges

Operating in its Element

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The energy transition is in full swing at 18 kilometers from the Dutch coast. Vattenfall and partners are busy realizing a large wind farm. The Hollandse Kust Zuid Wind Farm comprises of two plots of approximately 225 km2. In total 140 powerful 11MW Siemens Gamesa wind turbines will be installed. The wind farm will be the largest subsidy-free wind farm at sea and is expected to be fully operational in 2023.

Renewable energy, highly capable installation

For the installation of the 140 Siemens Gamesa 11MW wind turbines a fleet of vessels is commissioned of which two GustoMSC designed units. Both workhorses combined have over 25 years of experience and are perfectly qualified for supporting Vattenfalls sustainable ambitions. The Seaway Strashnov, a GustoMSC heavy lift vessel design, was contracted for the foundation installation. The vessel shipped the foundation components from the Maasvlakte near Rotterdam, where the Sif foundation factory is located, to the wind farm about 18 km off the Dutch coast. The foundations with a diameter of 8 m have lengths between 62 m and 75 m and weigh between 735 tons and 955 tons, are upended using the GustoMSC heavy lift crane and installed at the site. Seaway Strashnov is a highly capable crane vessel. A 5,000 t main hook and 800 t auxiliary hook enables the vessel to undertake an impressive range of projects from monopile installation to dual hook upending of large jackets, to heavy topside installations. The Seafox 7, a GustoMSC SEA-2000 design, is commissioning the converter stations. Additionally, Cadeler's Wind Osprey with an NOV heavy lift crane is tasked with the installation of the Siemens Gamesa turbines with a tip height of 251 m, and 97 m long recyclable blades.

It is great to see all our ideas now put into practice, and work with so many great people who are all very excited about this ground-breaking project. Malte Roeder, Foundation Installation Manager Vattenfall

March 2023 Reading time: 2 min

Photos credits: Cadeler & Seaway 7

Related content

Zana Sulaiman CFD Expert Engineer

Unlocking the full potential of offshore units There is a tendency to design ever larger jack-ups enabling the installation the ever lager offshore wind turbines. This makes stability and using accurate wind loads prediction even more important. Testing this with a scale model in the early design stage is expensive and time-consuming. Also, separate parts of the jack-up such as the legs, cranes and deck load cannot be accurately tested at model scale because of large scale effects involved. With GustoMSC’s CFD calculation method, it is also possible to calculate the wind loads acting on the components of the jack-up separately for wind loads even at full scale. Less costs and more efficiency with the CFD method By accurately predicting the wind loads on jack-ups and its components with the CFD method, the jack-up can be optimized at the beginning of the design phase. This not only results in significant cost savings, but also increases the efficiency of jack-ups. By using the CFD method in the design phase, more space can be created on the deck of the jack-up, allowing more cargo to be transported. In addition, a lighter jack-up also offers an advantage during transport from port to the offshore work location. A lighter jack up consumes less fuel and that results in a smaller industry footprint.

The main advantage of using CFD is that it can provide useful information at the start of the design process. Zana Sulaiman

The same cross-sectional view of the velocity magnitudes but now with the deck load

Cross-sectional view of the velocity magnitudes along with the pressure distribution on the jack-up without deck load at a flow angle of 90 degrees

Wind farm Hollandse Kust Zuid Our Workhorse Designs Supporting Vattenfalls Sustainable Ambitions

Operating in its Element

InSide

A storytelling platform about our offshore challenges

The energy transition is in full swing at 18 kilometers from the Dutch coast. Vattenfall and partners are busy realizing a large wind farm. The Hollandse Kust Zuid Wind Farm comprises of two plots of approximately 225 km2. In total 140 powerful 11MW Siemens Gamesa wind turbines will be installed. The wind farm will be the largest subsdiy-free wind farm at sea and is expected to be fully operational in 2023.

March 2023 Reading time: 2 min

Fossil-free within one generation Vattenfall's ambition is to generate all energy fossil-free within one generation. That is why Vattenfall invests in sustainable energy, such as wind energy. In doing so, Vattenfall seeks the balance between a reliable and affordable energy supply with a production method that is as sustainable as possible.

Read more: https://vattenfallhollandsekust.nl/en/vattenfall/