COPENHAGEN / STEVNS: The Capital District's Supply Company (Hofor) wants to build the 300 MW offshore wind farm Aflandshage Windmill Park approximately ten km from the southern tip of Amager and a good eight km from the northern part of Stevns. But the wind farm must not only supply green power to approx. 300,000 households. It must also improve marine biology in the Øresund.
Forsyningsselskabet is thus betting that a side benefit may arise in connection with the construction of the offshore wind farm. The side benefit should be more cod in Øresund and Køge Bay - as well as a general improvement of the living conditions for both marine plants and animals in the area around the turbines. In any case, these are requirements that are specified in tender materials, the company states in a press release.
- We want our offshore wind turbines to have a good impact on the surrounding environment. That is why we have made demands in our tender that the foundations of the turbines must function as artificial rock reefs in the best possible way - a so-called Nature Inclusive Design, says Stig Balduin Andersen, project manager at Hofor. He continues:
- Research has shown that the foundations of offshore wind turbines can have a positive effect on marine biology. This applies in particular to the type of foundations we have chosen for Aflandshage – concrete foundations that stand on the seabed, and where the seabed around the foundations is covered by several layers of stone that act as erosion protection. We will specifically target our design with artificial rock reefs, so that it supports the life of cod, which over a long period of time has declined in Øresund and Køge Bay.
For cod, it applies that stones laid out up to 15 meters below sea level are particularly suitable for improving living conditions. HOFOR therefore demands that bidders document how erosion protection laid out at these water depths will improve the cod's living conditions.
Also requirements for a low CO2 footprint
In addition to the requirement for Nature Inclusive Design, HOFOR has also made it a criterion for the award of a contract that the future contractor considers sustainable solutions. Including, not least, that concrete with a lower CO2 footprint is used, and that fuel consumption in connection with the construction work is generally reduced.
HOFOR's tender for turbine foundations for Aflandshage Wind Farm was launched in September 2022. HOFOR expects to be able to complete the large and complex tender in autumn 2023 with the award of a contract.
The tender includes design, production, construction, transport, installation and testing of the total of 26 concrete foundations to be built for the Aflandshage Wind Farm. Project manager Stig Balduin Andersen expects the total work to be carried out over a period of approximately two years.
Aflandshage Wind Farm will consist of 26 modern offshore wind turbines with a total height of up to 220 meters to the top of the blade.
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