Nordseecluster is a group of offshore wind farms with a combined capacity of up to 1.6GW being developed in the eastern region of the German North Sea.
The project is jointly owned by RWE (51%) and Norges Bank Investment Management (49%). RWE is responsible for overseeing both the construction and the long-term operation of the project.
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Nordseecluster is being delivered in two stages: Nordseecluster A and Nordseecluster B. The 660MW Nordseecluster A comprises two wind farms, NC 1 (225MW) and NC 2 (435MW), while the 900MW Nordseecluster B comprises NC 3 (420MW) and NC 4 (480MW).
Offshore construction activities for Nordseecluster A began in 2025. Foundation installation was completed by the end of that year, with cable-laying currently in progress.
Nordseecluster A is expected to enter commercial operation in early 2027, followed by Nordseecluster B in 2029.
Once fully operational, the entire Nordseecluster project is forecast to generate 6.4 terawatt-hours (TWh) of electricity annually, enough to meet the needs of approximately 1.6 million average households.
Nordseecluster offshore wind project location
The Nordseecluster offshore wind project is situated around 50km north of Juist island, within the German Bight area of the North Sea, which has been designated for offshore wind development.
Positioned in the southernmost row of offshore projects within the exclusive economic zone, the site is bordered to the north and south by major shipping traffic separation routes.
Nordseecluster is also located near the 332MW Nordsee One wind farm operated by RWE and Northland Power.
Development background
RWE and Northland Power initially partnered on the Nordseecluster project. RWE reached an investment decision regarding the project in May 2024.
In June 2024, the German Federal Maritime and Hydrographic Agency granted planning approvals for the complete construction and operation of the project’s first phase.
Norges Bank Investment Management acquired Northland Power’s 49% ownership stake in March 2025.
Nordseecluster offshore wind farm make-up
The Nordseecluster offshore wind farm will be equipped with 104 Vestas V236-15.0MW wind turbines, each offering a capacity of 15MW.
Nordseecluster A will be installed with 44 turbines, while Nordseecluster B will feature 60 turbines.
The V236-15.0MW model features a 115.5m rotor and a swept area of 43,742m2. These turbines are designed for low-emission operation and will be installed on single-piece monopile foundations with an integrated monopile-transition piece design.
The monopiles will measure 85m in length on average and weigh 1,500t each.
Incorporating next-generation wind turbine technology, the project will require approximately 40% fewer turbines compared to conventional models, thereby reducing the number of interconnecting cables and foundations. The wind farm will also utilise sulphur hexafluoride-free switchgears.
Operations and maintenance of the Nordseecluster project will be undertaken from a 1,700m2 (18,299ft2) new warehouse at the port of Eemshaven.
Grid connection
The electricity generated by Nordseecluster A will be collected by two offshore substations, which will increase the voltage and then transmit the power to TenneT’s DolWin 6 kappa converter station to connect to the grid.
The 44 wind turbines at Nordseecluster A will be connected to the offshore substations through 185km of 66kV aluminium and copper conductor cables.
Additionally, the substations are equipped to gather operational data from the wind farms and facilitate remote monitoring and control from land.
The design, construction and integration of the two offshore substations were finalised in February 2026. The foundations for both substations have already been installed.
The topside of the substation for Nordseecluster A’s NC 1 wind farm measures 41m in length, 26m in width and 22m in height. It weighs around 1,800t.
The NC 2 wind farm substation topside measures 42m in length, 30m in width and 22m in height. The topside weighs 2,500t.
Nordseecluster B will be directly connected to the grid through the DolWin4 converter station developed by Amprion Offshore.
Financing
The EU Innovation Fund awarded a grant of €95.9m ($113.8m) to support the 435MW NC 2 wind farm.
Power purchase agreement
In February 2026, Amazon entered into a power purchase agreement with RWE for 110MW of capacity from the Nordseecluster B offshore wind farm.
This agreement forms part of Amazon’s efforts to achieve net-zero carbon emissions across its operations by 2040.
Contractors involved
Atlantique Offshore Energy, the marine energy division of Chantiers de l’Atlantique, is supplying the two offshore electrical substations for the Nordseecluster project.
Dajin Offshore is responsible for the manufacture and delivery of the monopile foundations for the wind turbines, as well as secondary structures and electrical outfitting.
Hellenic Cables, in partnership with Jan De Nul, has been selected for the design, production, transportation and installation of three 155kV high voltage, alternating current grid connection cables, with a total length of 37km.
In December 2023, Havfram Wind of Norway was awarded a contract by RWE to transport and assist with the installation of the turbines using its new wind turbine installation vessels.
Van Oord, a Dutch company, received a contract in May 2024 for the transport and installation of the monopile foundations for the project using its Boreas installation vessel.
In June 2024, Vestas secured a firm order to supply, deliver and commission 44 V236-15.0MW wind turbines for the Nordseecluster A wind farm. The agreement includes a five-year service contract, followed by operational support. The order for 60 V236-15.0MW turbines for Nordseecluster B was placed in November 2025.
In June 2025, the Dutch division of Clarkson Port Services, was awarded two long-term agreements by RWE to construct a new warehouse facility and to provide logistics and port services for the project over ten years.
In October 2025, DEME was awarded a contract to undertake the transport and installation of 124km of inter-array cables for the Nordseecluster B offshore wind farm, utilising DEME’s Living Stone offshore and cable installation vessel.
DeepOcean has been appointed to carry out trenching, transport and installation of all inter-array cables, along with associated services, for the wind turbines in Nordseecluster A.
Acta Marine, Waves Group, JBO Engineering Group, IQIP, and Welcon are some of the other contractors involved in the project.
