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Hollandse Kust Zuid Wind Farm Zone

  • Project Type

    Offshore wind farm complex

  • Location

    North Sea, South Holland, Netherlands

  • Planned Capacity


  • Owner and Developer

    Hollandse Kust Zuid I and II: Vattenfall

  • Estimated Investment

    Hollandse Kust Zuid I and II: €1.5bn ($1.6bn)

  • Start of Construction


  • Start of Operation


Hollandse Kust Zuid Wind Farm Zone (HKZWFZ) is a 1.5GW offshore wind farm complex planned to be developed 22km away from the Dutch North Sea coast, Netherlands.

The offshore wind power zone will comprise four wind farm sites of more than 350MW installed capacity each.

Chinook, a subsidiary of Vattenfall, won the tender for the Hollandse Kust Zuid wind farm sites (HKZWFS) I and II in the HKZWFZ tender round concluded in December 2017.

Vattenfall received permits for the construction and operation of the 750MW Hollandse Kust Zuid I and II offshore wind farms from the Dutch Minister of Economic Affairs and Climate Policy in March 2018.

Preparatory works including site surveys and detailed design are currently underway for the project. Vattenfall plans to start construction on the €1.5bn ($1.6bn) offshore wind project in 2022 and turn it operational by 2023.

Hollandse Kust Zuid I and II will be one of the world’s first non-subsidized wind projects and is expected to generate enough clean electricity to power up to 1.5 million households a year.

The tender for Hollandse Kust Zuid III and IV, the second 750MW offshore wind project to be developed without subsidy in the HKZWFZ, is expected to be awarded by early 2020.

The major bidders for the second project include Vattenfall as well as Witwind, a consortium of Shell, Van Oord, and Eneco.

 Hollandse Kust Zuid wind farm zone location

 Hollandse Kust Zuid wind farm zone will encompass a 235.8km² in the coastal waters of Zuid-Holland (South Holland) province, off the west coast of Netherlands.

 Hollandse Kust Zuid I & II wind farms make-up

Covering 67.2km² and 47.7km² respectively, the HKZWFS I and II wind farms will feature a total of 76 SG 10.0-193 direct drive turbines from Siemens Gamesa.

The SG 10.0-193 DD turbine is one of the most powerful commercially available wind turbines in the world and is expected to increase offshore wind power generation efficiency by 30%.

With a rotor diameter of 193m and blade length of 94m, each pitch-regulated variable-speed wind turbine has a swept area of 29,300m² and rated power of 10MW.

The operation and maintenance of the wind farm will be carried out from a new service center to be developed at the IJmond harbor area near the Port of Ijmuiden. The service center will be an energy-efficient building with solar panels installed on its roof.

The wind farm is expected to be employed with 40 full-time professionals during its operation phase. Vattenfall plans to utilize hydrogen-powered boats for the offshore transport of maintenance staff.

Power transmission

The power generated by the turbines at Hollandse Kust Zuid wind farm zone will be gathered and transmitted through 66kV cables to two offshore substations namely Hollandse Kust (zuid) Alpha and Hollandse Kust (zuid) Beta.

Power from each offshore substation will be transmitted onshore through two 220kV cables connecting the high-voltage Maasvlakte substation on the mainland, before connecting further with the Randstad 380kV South Ring transmission system.

TenneT, the offshore grid operator in the Netherlands, will be responsible for the development and operation of the transmission infrastructure of the Hollandse Kust Zuid wind farm zone.

TenneT and Vattenfall signed agreements for the offshore grid connection of the Hollandse Kust Zuid I and II projects via the Hollandse Kust Zuid Alpha offshore platform in January 2019.

Contractors involved

 Vattenfall announced Siemens Gamesa as the supplier of wind turbines for the HKZWFS I and II wind farms in April 2019.

Windcat Workboats has been contracted for the supply of hydrogen-powered crew transfer vessels (CTVs) for the maintenance of the wind farm.

A consortium of Van Oord and Hellenic Cables was selected by TenneT to supply and install cables for the Hollandse Kust Alpha and Beta transmission projects in September 2018.

LMR Drilling was chosen to perform horizontal directional drilling for the transmission projects.