Seaway Offshore Cables
Hollandse Kust Zuid 1-4 Offshore Wind Farms
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Hollandse Kust Zuid 1-4 Offshore Wind Farms

66kv inner array grid cable system

Seaway Offshore Cables was awarded the contract for the transport and installation (T&I) as well as related termination, testing and commissioning works related to the inner array grid cable system of the Hollandse Kust Zuid 1-4 offshore wind farm project by Vattenfall.

The Hollandse Kust Zuid (HKZ) 1-4 offshore wind farm is located between 18-36 km off the Dutch west coast within the North Sea. The OWF consists of 140 wind turbine generators, each with a capacity of up to 11.0 MW and is based on an inner array grid of 140 medium voltage aluminium core submarine composite cables with a total length of up to 322km.

The submarine composite cables are to be manufactured and supplied by Twentsche Kabelfabriek (part of TKH Group) and Prysmian PowerLink (part of Prysmian Group) and are subsequently to be installed by Seaway Offshore Cables utilising dedicated in-house resources such as the Cable Lay Vessel Seaway Aimery and Installation Support Vessel Seaway Moxie.

Facts and figures
  • 140 Wind Turbine Generators

  • 1,500 MW Installed Capacity

  • 2 Offshore Substations (OSS)

  • 322 KM of Submarine Cables

We look forward to working collaboratively with Vattenfall as a trusted partner to install the foundations and inner array cables for the Hollandse Kust Zuid 1-4 wind farms and help to deliver the first subsidy-free offshore wind project in the Netherlands."

Steph McNeill
Executive Vice President
Client: Vattenfall Hollandse Kust Zuid 1&2, NL
Vattenfall Hollandse Kust Zuid 3&4, NL
Location: North Sea, Dutch Sector
Water Depth: Up to 27 m
Scope: Supply of cable protection systems
Supply of subsea crossing materials
Pre-lay grapnel run and route clearance
Cable installation, termination, testing and pre-commissioning
Type of Cables: 3-core submarine composite cable
Voltage Level: 66 kV
Conductor: Aluminium
No. of Cables: 140
Length of Cables: 322 km
WTG’s: 140 x 11.0 MW, Siemens Gamesa Renewable Energy
Total Capacity: 1,500 MW
Schedule: One (1) continuous campaign in 2022 and 2023
Vessels: CLV Seaway Aimery
ISV Seaway Moxie
W2W Connections: TBA
W2W Transfers: TBA
Want to know more?
Lets have a chat!
Lars Muck
Commercial Director