Sif produces first monopiles for Hollandse Kust Zuid

Sif has rolled out the first two monopiles for the Hollandse Kust Zuid offshore wind farm. The Dutch steel manufacturer has 138 more to deliver for the 1.5 GW offshore wind project.

Hollandse Kust Zuid, comprising 4 sites, is being built by Vattenfall. Vattenfall won the rights to build the wind farm through 2 separate tenders in 2018 and 2019. The energy company awarded Sif Group the contract to manufacture the monopiles. The scope of works also included storage at the Maasvlakte 2 facility.

The design for the monopiles is without TP. The parts normally attached to the transition piece, such as the work platforms and ladder, are now attached directly to the monopile. This should allow for faster installation according to the company.

The new monopile design underwent a mock-up trial at Maasvlakte 2 last year to test the different installation techniques. In a second trial, the final installation methods and processes are established. Seaway 7 is responsible for the transportation and installation of the monopiles which are planned to start this summer. The monopiles, with a combined weight of approximately 115,000 tonnes, will each hold the 11 MW Siemens Gamesa offshore wind turbines. Hollandse Kust Zuid is due to become operational in 2023. Photo: © Sif

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