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Jan De Nul installs subsea cables Hollandse Kust (north) and (west Alpha)

By: Tom Russell 21/10/2022 Jan de Nul Group

Cables General Windfarms

Subsea cables for TenneT's Hollandse Kust (north) and (west Alpha) offshore grid connection projects have been laid in the bottom of Heemskerk beach and in the seabed by contractor Jan de Nul Group. It concludes the job for the intertidal trenching vehicle Moonfish off the coast of North Holland.

Earlier this week, the last two of four subsea cables (220kV) were buried by contractor Jan de Nul intended for the connection of the Hollandse Kust wind farm (West Alpha). These cables are now almost 6 km each 'capped' in the seabed. Once the rest of the cables are brought to the Netherlands, the sections will be connected with an offshore substation platform.

Jan de Nul Group is awaiting the delivery of the remaining cables from South Kora for installation offshore. The west Alpha substation is located about 50 kilometres off the coast of Egmond aan Zee. Because the cables cannot be laid as the crow flies, these cables will each be 70 kilometres long in total.

For Hollandse Kust (north), the transformer platform is now 18.5 kilometres off the coast of Egmond aan Zee. The sea cables for 'north' are already ready in the seabed. Behind the dunes near Heemskerk/Wijk aan Zee, the four subsea cables will be connected to the onshore cables that will soon feed the electricity into the high-voltage substation along the A9 in Beverwijk.

Earlier this month, the topside for the Hollandse Kust (north) grid connection project was placed on its previously installed jacket foundation. Next to the substation is a jackup barge with a walkway to the platform. A team of some 50 mechanics/installers will stay on the vessel for the next few months. They will weld the topside to the jacket and carry out the rest of the installation, testing and commissioning.

Offshore construction is officially underway at the Hollandse Kust Noord offshore wind farms with the installation of the first monopile earlier this week. A total of 70 monopiles will be installed by Van Oord over the coming months, around 18km off the coast at Egmond aan Zee. The installation of the monopiles is expected to be completed by mid-2023.

Before the end of this year, TenneT plans to test the fibre-optic connection for Hollandse Kust (north) grid connection project which was laid together with the sea cables, and the high-voltage connection. It can then be used to control the socket and wind farm. In the course of next year, the platform (with a capacity of about 700 megawatts) will be ready and TenneT will make renewable energy from the wind farm available to households, businesses and industry.

The Hollandse Kust (west) Wind Farm Zone is located approximately 50 km off the west coast of the Netherlands. It consists of two wind farm sites, Site VI and VII ,which have been tendered by the Dutch government. The winners are due to be announced in the coming weeks. The total surface area of the Wind Farm Sites within the zone (including maintenance and safety zones) is approximately 176 km2. Hollandse Kust (west) Wind Farm Zone will accommodate 1,400 MW of offshore wind power capacity.

For more information on offshore wind farms worldwide, click here.

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Jan De Nul installs subsea cables Hollandse Kust (north) and (west Alpha)

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