The offshore transformer station of the Hollandse Kust (Zuid) Alpha platform was successfully installed on the
jacket in the North Sea, about 20 kilometers off the coast of The Hague. The transformer station, also called topside, 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.”
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. MidNovember, 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, 2021.
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 in the North Sea. After completion of preparatory work, Pioneering Spirit accurately
positioned the Alpha topside on the substructure, also known as a jacket.
“It is great to be involved in an energy project of such strategic importance to the Netherlands,” said Edward
Heerema, President, and CEO of Allseas.