NRG scores onshore cable contract for Hollandse Kust (West Beta)

4C Offshore | Tom Russell
By: 13/05/2022 TenneT

TenneT has announced that it has hired a contractor combination NRG (Denys, Alsema and Van Vulpen) to realise the link between the offshore cables for the
Hollandse Kust (west Beta) offshore wind farm and the transformer station in Wijk aan Zee for TenneT.

NRG will install 2.5 km of high voltage underground cables from Velsen Beach. This will be done by means of underground directional drilling, as used for the Hollandse Kust (north) and (west Alpha) projects.

The work is expected to start sometime in the autumn of 2023. However, this depends on an ongoing appeal procedure at the Council of State. The hearing will take place on 7 July, after which a decision is expected next fall. In order not to lose any valuable time in connecting offshore wind energy, TenneT has received permission from the Ministry of Economic Affairs and Climate Change to award this project component in advance. This means NRG can start detailed engineering and drawing up work plans.

Hollandse Kust (west Beta) wind farm will have a capacity of 700 MW and is scheduled to be put into operation in 2026. The Hollandse Kust (west Beta) offshore grid is the total grid connection from the Hollandse Kust (west Beta) offshore wind farm to the new transformer station at Wijk aan Zee. From there the power goes via underground cables to the high-voltage station along the A9 highway in Beverwijk. This high-voltage station is part of the national high-voltage grid (Noordring 380 kV).

The total project features an offshore transformer platform which all wind turbines will be connected to in order for the voltage of the generated electricity to be increased from 66 kiloVolt (kV) to 220 kV. It also includes 66 kV interlink cable between the platform for west Alpha and the platform for west Beta to be installed offshore. A further two 220 kV offshore cable systems will link the platforms to the onshore transformer station. The cables will come ashore south of Wijk aan Zee.

The transformer substation is being expanded  for the Hollandse Kust (north) and (west Alpha) wind farms. At the transformer station, the power will be brought from 220 kV AC to 380 kV AC. From there, the power will be fed into the national high-voltage grid via underground 380 kV cables some ten kilometres further along the A9 highway.