First Hollandse Kust (zuid) offshore platform completed

On Sunday, 26 December, Allseas’ installation vessel Pioneering Spirit successfully installed the topside of the Hollandse Kust (zuid) Alpha platform on the jacket in the North Sea, about 20 kilometres off the coast of The Hague. This transformer station is one of the two topsides of the Hollandse Kust (zuid) offshore grid, which will connect the offshore wind farm area with the same name to the Dutch onshore high-voltage grid.

Marco Kuijpers, Director of Large Projects Offshore: “With the installation of the Alpha topside, the offshore grid that TenneT is building in the North Sea is starting to take shape. Hollandse Kust (zuid) Alpha is the first connection of an offshore wind farm to the Maasvlakte, with a capacity of 700 MW. Wind energy plays a crucial role in the energy transition, also in industry, and I am proud that TenneT can contribute to a sustainable future in this way.”

Built in Dubai

Over the past year, contractor Petrofac has been working on the fabrication of two High Voltage Alternating Current (HVAC) transformer stations Alpha and Beta at the Drydocks World fabrication yard in Dubai. Mid-November, Mammoet, a specialist in heavy transport and lifting, took care of the weighing and loading of the 3,830-tonne Alpha topside onto the transport vessel Tai An Kou. From Dubai, the Tai An Kou sailed in one month to the Alexiahaven on the Maasvlakte, where it arrived on Tuesday December 21st.

Installation by Allseas

In the Alexiahaven, the Alpha topside was loaded from the transport vessel onto the multipurpose platform installation and removal vessel Pioneering Spirit of offshore company Allseas, which then sailed to the installation location where it positioned the Alpha topside on the jacket foundation which was installed in September 2020.

Beta topside

The Beta topside – also with a capacity of 700 MW – is expected to follow in the first quarter of next year. When the wind farm area Hollandse Kust (zuid), developed by wind farm developer Vattenfall, is fully operational in 2023, it will generate an amount of renewably energy that is equivalent to the annual consumption of more than two million households. Hollandse Kust (zuid) is the first subsidy-free wind farm area in the world. Source: TenneT

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