Seaway 7 Install Last Foundation on Hollandse Kust Zuid – Heavy Lift News
12 Sep 2022

Seaway 7 Install Last Foundation on Hollandse Kust Zuid

“Last pile is in. Done and dusted. Thanks to all involved!” Victor Donchenko, Captain of Seaway 7’s Seaway Strashnov.

On the 4th September, a new milestone was reached in the construction of Vattenfall’s wind farm Hollandse Kust Zuid when the last of 140 monopiles was piled into the Dutch sector of the North Sea.


The Seaway Moxie connecting the ‘no TP’ monopile foundations with the inter array cables


Vattenfall’s Foundation Installation Manager, Mary Carol Anderson, reflected on this milestone: “A big achievement by the project team, our contractors – Seaway 7 and  Sif – and all other parties involved. Going from installing 34 foundations in the 2021 summer campaign, to installing 106 foundations in 2022, is a huge testament to the team!”

The 8m diameter foundations manufactured by Sif have lengths between 62m and 75m, and weigh between 735t and 955t.


Cadeler’s Wind Osprey about to fit blades to a Siemens Gamesa 11MW turbine


There are two jack up installation vessels currently working on the wind farm project. Cadeler’s Wind Osprey continues installing the Siemens Gamesa 11MW turbines at a tip height of 251m, and the 97m long recyclable blades. Four sets of turbines and blades are loaded on the Wind Osprey for each voyage from the quay side at Sif on Maasvlakte 2 in the Port of Rotterdam to the wind farm location.

On completion, due early in October 2023, the wind farm will be rated at 1.52GW.


The Seafox 7 is contracted to the grid connector TenneT currently on the Bravo Substation.


Situated 18km off the Dutch coast between the ports of IJmuiden and Scheveningen, the furthest foundation is located 36km off the coast.

Featured Title photograph

Loading foundations on to the Seaway Strashnov at the Sif Quay in the Port of Rotterdam courtesy of Vattenfall


All photographs with the exception of the featured title photograph are copyright of


Source Vattenfall and HLN


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