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Van Oord to bury Hollandse Kust Zuid cables

By: Tom Russell 23/09/2020 Van Oord

Cables General Windfarms

Van Oord’s Deep Dig-It trencher crossed the busy shipping route Rotterdam Maasmond and is on its way to the offshore Alpha jacket in the Hollandse Kust Zuid wind farm area.

TenneT is building the Hollandse Kust Zuid offshore grid to connect new offshore wind farms. Four cables will have to be buried into the North Sea seabed for this purpose. The subsea cables connect two offshore platforms with the Maasvlakte high-voltage substation and the Randstad 380 kV South ring. For the first 10 kilometres of the cable route, these cables will have to be buried more than 5 metres into the seabed in order to cross the busy shipping route Rotterdam Maasmond.

The Van Oord-Hellenic Cables consortium will be installing the four subsea 220 kV AC cables that will connect two offshore platforms to the onshore electricity grid. The first two cables to the Alpha platform will be installed this year. The other two cables, meant for the Beta platform, will follow in 2021.

Over the last few days the preparatory work has been completed. The cable was pulled ashore via a direct drill to the new transformer substation that is being built on the Maasvlakte. From this point, the cable with a total length of 42 kilometres to the wind zone Hollandse Kust (zuid) will be laid by the Deep Dig-It, a large remote-controlled trencher.

Van Oord's Deep Dig-It is a Tracked Remotely Operated Vehicle (TROV) that drives unmanned over the seabed and creates a deep trench for the cables by liquefying the seabed. At the same time, the trencher inserts the cables into the trench and seals them again into the seabed. The Deep Dig-It is controlled at Van Oord's offshore installation vessel MPI Adventure, which is also equipped with a crane to launch and take out the Deep Dig-It.

The 1,400 MW grid connection will be completed in 2022 and will eventually provide electricity for 1.6 million households. It will support the transmission of energy from two offshore wind farms, Hollandse Kust Zuid 1&2 and Hollandse Kust Zuid 3&4. The sites are located 22 kilometres off the coast of the Dutch province of Zuid-Holland.

Vattenfall secured the rights to the Hollandse Kust Zuid 1&2 and Hollandse Kust Zuid 3&4 offshore wind farms with zero subsidy bids in March 2018 and July 2019. The projects will have a combined capacity of 1.5 GW and will feature 140 SG 11.0-200 DD turbines. Offshore construction is scheduled to start in 2021, with commissioning in 2023.

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

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Van Oord to bury Hollandse Kust Zuid cables

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