The Aflandshage project is a 300MW offshore wind farm planned to be developed in the Øresund (Sound) strait, Denmark. The project is being developed by HOFOR Vind (HOFOR).
HOFOR started working on the project in 2011 and received permission from the Danish Energy Agency to assess the establishment of the project in March 2019. The agency approved the environmental report of the offshore wind power project in June 2022.
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Construction on the project is expected to commence in the second half of 2024 and the wind power project is anticipated to enter into operations in 2026.
The Aflandshage offshore wind farm is expected to generate enough electricity to power up to 300,000 homes near the Øresund region. It is expected be to a major contribution to Denmark’s goal to reduce CO2 emissions by 70% in 2030.
Middelgrunden and Lillgrund are the offshore wind farms already operating in the Sound. Middelgrunden consists of 20 turbines and is owned by HOFOR and Middelgrundens Vindmøllelaug, while Lillgrund is owned by Vattenfall, featuring 48 turbines.
Location and site details
The Aflandshage offshore wind farm will be located in the southern Sound, about 10km from the southern tip of Amager and about 8km northeast of Stevns, Denmark. It will be about 12km west of the Swedish coast from Falsterbo.
The project site will occupy a total area of approximately 65km2, with turbines, inter-array cables and a potential offshore substation covering an area of approximately 42km2.
Aflandshage offshore wind farm details
The Aflandshage offshore wind farm development is planned to include the installation of 26-45 advanced turbines, with each turbine expected to have a generation capacity of between 5.5-11MW.
The total height of each turbine is expected to be in the range of 210-220m, with up to 200m-diameter rotor. The type of foundations to be used for the turbines is expected to be steel monopile foundations or concrete gravity-based structures (GBS).
A substation is proposed to be built either onshore in the municipality of Avedøre Holme or in the offshore area where the turbines will be placed. The onshore substation installations are expected to be included in a building with an area of at least 200m2 and a height of up to 7m.
The power generated by the wind farm will be transported through offshore and onshore high voltage cables. The submarine cables will be installed 25m apart.
The cable corridor will consist of up to six parallel grid connection cables to connect the wind farm to the existing onshore grid. It will cover an area of approximately 12.5km2 from the north-western corner of the wind farm site.
Power purchase agreement
Ørsted executed a letter of intent with HOFOR to purchase the electricity generated by the Aflandshage offshore wind farm for the 1.3GW Green Fuels for Denmark project in June 2021.
The Aflandshage wind farm will supply electricity to carry out electrolysis for the first 10MW phase and part of the second 250MW phase of Ørsted’s project, which is planned to supply sustainable fuels in the Greater Copenhagen region.
The agreement is also expected to enable HOFOR to install the substation of the Aflandshage offshore wind farm at the Ørsted-owned Avedøre power plant, where the Green Fuels for Denmark project will be located.
Power evacuation
The electricity generated by the Aflandshage wind farm will be evacuated into the existing power grid at Energinets 132kV substation at Avedøreværket, through a newly built substation. The Energinets substation is owned by HOFOR.
Contractors involved
NIRAS was contracted by HOFOR to support the completion of the environmental surveys and prepare the environmental impact assessment (EIA) for the Aflandshage offshore wind farm.
GEUS was subcontracted to carry out a desktop study to assess the presence of unexploded ordinance (UXO) at the Aflandshage site.
COWI was engaged to provide advisory services to HOFOR in connecting the electrical infrastructure of the Aflandshage facility with the transmission system and the facilities of the Green Fuels for Denmark project.
