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Borssele III and IV offshore wind farm is a 731.5MW wind project being developed 22km offshore the Zeeland province in the Netherlands.
The project is being developed by Blauwwind consortium, which includes Partners Group (45%), Shell (20%), Diamond Generating Europe (DGE, 15%), Eneco Group (10%), and Van Oord (10%). The Dutch Minister of Economic Affairs selected Blauwwind consortium for the construction of the wind farm in December 2016, under a 30-year lease agreement.
The estimated investment for the project construction is €1.3bn ($1.5bn). The project achieved financial closure in June 2018.
Construction of the wind farm commenced in 2019, while commercial operations are scheduled to begin in 2021. Designed to operate for 25 years, the wind farm will have the capacity to supply power to approximately 825,000 households a year.
Borssele III and IV offshore wind farm details
Borssele III and IV offshore wind farm is being developed on a 146km² area, approximately 55km from the Port of Vlissingen in the Borssele wind farm zone (BWFZ). The BWFZ consists of five wind farm sites and can generate more than 1,400MW of energy by 2020.
Borssele III and IV offshore wind farm will feature 77 MHI Vestas V164 9.5MW wind turbines, which will be installed on monopiles in a water depth between 16m and 38m. Each monopile will be 85m-long and will weigh 1,280t.
The wind farm will include the Borssele Beta offshore transformer substation, which will be designed and constructed by TenneT, Netherlands’ national electricity transmission system operator. The offshore substation is scheduled to become operational by 2021.
The wind turbines will be connected to the transformer substation through 66kV cables.
A service operations vessel (SOV) will perform maintenance of the wind farm.
The offshore construction activities will include the installation of scour protection and monopoles. An offshore vessel Aeolus installed the first monopile for the wind farm in October 2019.
The cables will be installed after the monopoles, followed by the turbines. Van Oord’s Nexus cable-laying vessel will have a cable carousel capacity of 5,000t and will be used to lay the cables.
Van Oord’s new AdBm Sound Mitigation System will help to reduce underwater noise during pile driving works.
Transmission and grid connection
The power produced by the turbines will be transported to the Borssele Beta offshore transformer substation, where it will be converted from 66kV to 220kV. The power will then be transferred to the onshore substation through 220kV export cables that will convert the power into 380kV and feed it into the national electricity grid.
Power purchase agreement for Borssele III and IV wind farm
Shell and Eneco Group will each receive 50% of electricity produced by the project, under a power purchase agreement (PPA) signed with the Blauwwind consortium.
Blauwwind will be paid €54.49/MWh ($63.27/MWh) under the Dutch SDE+ scheme during the first 15 years of the power plant operation. Then, the power will be sold at prevailing market prices.
Van Oord was selected as the balance-of-plant contractor for the project. The company is responsible for the engineering, procurement, and construction of the wind farm’s foundations and inter-array cables.
In April 2018, Sif Holding won a contract to construct the 77 monopiles for the wind farm.
MHI Vestas is responsible for the supply and maintenance of the wind turbines.
Mott MacDonald provided technical advisory and will also offer construction and operation monitoring services for the project. Green Giraffe is the financial advisor for the Borssele III and IV offshore wind farm.
Borssele wind project background
The project is part of the Netherlands Energy Agreement plan developed by the Dutch government to achieve 4.5GW of offshore wind capacity by 2024 through the Borssele, Holland Coast (South) and Holland Coast (North) offshore zones. A follow-up roadmap announced in 2018 aims to achieve an additional 7GW of offshore wind capacity by 2030.
Ørsted is developing the 752MW Borssele I and II wind farm, which is expected to be commissioned in 2020. The 19MW Borssele V wind farm was awarded to the Two Towers consortium, which consists of VOord Renewable Finance, Investri Offshore and Green Giraffe Holding.
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