Project information
Progress is being made on Thor, Denmark’s largest offshore wind farm to date. Thor will be in operations by 2027.
Latest project news
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Components and innovation
The Thor offshore wind farm will comprise a number of key components that will all work together to generate, transmit and convert green energy to be fed into the National Grid. It requires state-of-the-art technology and innovative engineering and each component has to work seamlessly with the others, each playing a pivotal role in the success of the project.
Wind turbines and foundations
The 72 offshore wind turbines (SG 14-236 DD) are supplied by Siemens Gamesa. 36 monopile foundations are manufactured by EEW SPC, while a further 36 monopile foundations and the secondary structures are delivered by Dajin Offshore.The foundations, each weighing around 1,500 tonnes, reach heights of up to 100 metres. The Danish-British engineering company Wood Thilsted designs the foundations. Jan De Nul Group provided the vessel for the foundation installation works, which were completed in November 2025.
Fred.Olsen Windcarrier provides the vessel for the turbine installation. The installation started in 2026. Both RWE and Siemens Gamesa intend to draw on the skilled local workforce during both construction and commissioning of the project, both in the harbour as well as offshore.
Height: 266 m
Rotor diameter: 236 m
Blade length: 115 m
Hub height: 147,6 m
Total weight: 1,658 ton
40 of the 72 (SG 14-236 DD) wind turbines will be equipped with the worldwide-first recyclable rotor blades manufactured by Siemens Gamesa. For the first time, thanks to a new type of resin with a special chemical structure the composite materials used in Siemens Gamesa’s recyclable blades can be separated again. This process ensures that the properties of the individual materials remain intact so that they can be reused in new casting applications, for example in the automotive industry or in consumer goods.
As the first developer in the world, we are pilot Siemens Gamesas GreenerTower(s). 36 turbines will be equipped with these CO2-reduced steel towers. The GreenerTower(s) will ensure a CO2 reduction of at least 63 percent in the tower steel plates compared to conventional steel. 160.000 tonnes steel will be used for the turbines. This is more than 2 times the Great Belt Bridge. By being the first developer in the world piloting these towers, RWE makes a significant step towards producing even more sustainable wind power.
Transmission system
A consortium between Hellenic Cables and Jan De Nul Group provided the entire cable package. The two companies manufactured and installed 60 kilometres of export cables along the 30-kilometre cable route from the offshore wind farm to shore and approximately 200 kilometres of inter-array cables connecting the turbines to the offshore substation. In addition, the consortium manufactured and installed the onshore cables from the landfall to the onshore substation, which was built by Siemens Energy in the municipality of Lemvig. Siemens Energy carried out the civil engineering and construction work together with MT Højgaard Danmark, one of Denmark’s leading companies for large-scale building and infrastructure projects.
HSM Offshore Energy has been selected for the engineering, procurement, construction, installation and commissioning of the offshore high voltage substation and its jacket foundation The installation of the jacket foundation and the substation topside took place in 2025, followed by the commissioning and testing of the offshore substation in 2026.
Installation vessels
“Les Alizés” is a purpose-built vessel designed for transporting, lifting and installing wind turbine foundations. It is the largest heavy lift vessel in Jan De Nul’s fleet. With the ability to lift up to 5,000 tonnes and a deck loading capacity of 61,000 tonnes, it is designed to handle the scale and design of foundations supporting the next generation of wind turbines.
Turbine installation is carried out by Fred. Olsen Windcarrier using its installation vessel Brave Tern. This vessel is able to transport and install three turbine sets per cycle.
