Hollandse Kust Zuid Beta Topside arrives in Rotterdam

Boskalis has completed the transport of the top of the Hollandse Kust Zuid (HKZ) Beta substation from Dubai to Rotterdam using its semi-submersible heavy lift vessel mighty servant 3.


The HKZ Beta topside is expected to be installed in the Hollandse Kust Zuid wind farm area in the Dutch North Sea in the coming days.

According to the vessel’s AIS data, mighty servant 3 and its massive cargo arrived in the Port of Rotterdam on March 22, a month after leaving the Drydocks World Dubai manufacturing plant.

The 700 MW, 3,950 ton HVAC offshore transformer station is delivered to TenneT by Petrofac, which also delivered the Hollandse Kust Zuid Alpha substation in cooperation with Drydocks World Dubai.

The jacket foundation for the HKZ Beta platform was installed at the site in June 2021.

At the end of January, the HKZ Beta jacket suffered damage as the freighter Juliet D collided with it and a turbine foundation at the Hollandse Kust Zuid wind farm after the ship unmoored during Storm Corrie and was swept towards the wind farm.

Shaft foundation damage will not affect the installation of the upper part of the Hollandse Kust Zuid Beta offshore substation, according to TenneT, which expects the upper part to be installed in late March or early April .

The transmission system operator (TSO) said it had carried out several inspections of the damaged liner, both above water and underwater, which showed ”…that damage to the rig jacket is limited…” and that “…damaged parts of the jacket can be repaired later.”

The offshore platforms HKZ Alpha and HKZ Beta will form the connection to the Hollandse Kust Zuid grid that connects the offshore wind farm area to the Dutch mainland at the Maasvlakte.

Located 20 kilometers off the Dutch province of Zuid-Holland, the wind farm area occupies an area of ​​235.8 square kilometers, where Vattenfall is constructing four wind farms as part of the Hollandse Kust Zuid project.

Once fully operational in 2023, the 1.5 GW Hollandse Kust Zuid will become the largest operating offshore wind farm in the world. Consisting of 140 Siemens Gamesa 11 MW wind turbines, the unsubsidized wind farm will produce enough electricity to meet the annual needs of more than two million homes.

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