Hollandse Kust Zuid Beta
OperationalOffshore GridNL700 MW220 kV34 km
Basic information
8 fieldsAlso Known As
Hollandse Kust Zuid Beta grid connection · Hollandse Kust (zuid) Beta offshore grid · HKZ Beta grid connection
Status
operational
Capacity
700 MW
Owners
Project Company
Type
offshore grid
Transmission Model
TSO Build & Own
Website
Supply Chain (5)
Project Timeline (12)
Feb 2022Oss Topside Installation
In February 2022 TenneT, using Allseas’ heavy-lift vessel Pioneering Spirit, installed the 3,950-tonne Hollandse Kust Zuid Beta HVAC offshore transformer platform topside onto its previously installed jacket in the Dutch North Sea, making the HKZ Beta offshore substation ready for connection to Vattenfall’s Hollandse Kust Zuid wind turbines as part of the 700 MW grid connection.
2021Onshore Construction Start
As part of the Hollandse Kust (zuid) grid connection, TenneT built a new high-voltage substation and began expanding the existing Maasvlakte 380 kV substation, which will receive power from the HKZ Alpha and Beta 220 kV export cables and feed it into TenneT’s Randstad 380 kV South ring and the Dutch national high-voltage network.
Aug 2021Construction Other
By early August 2021 the jacket foundation for the Hollandse Kust (zuid) Beta offshore substation had been installed in the HKZ wind area about 18 km off the coast of Zuid-Holland, providing the support structure on which the 700 MW HKZ Beta offshore transformer platform for the grid connection will be placed.
30 Aug 2021Cable Installation Complete
By 30 August 2021, DEME’s cable-laying vessel Living Stone had completed installation of the export cable connecting the Hollandse Kust Zuid Beta offshore platform to the Dutch mainland, as part of a campaign in which Living Stone installed two 34 km export cables and an 8 km interlink cable for the Hollandse Kust Zuid offshore grid.
5 Aug 2021Cable Landfall Complete
By early August 2021, one of the Hollandse Kust (zuid) Beta export cables had been pulled ashore through the Beta jacket to TenneT’s newly built onshore transformer station at Maasvlakte, marking completion of the landfall and onshore pull-in for this section of the HKZ Beta grid connection.
5 Aug 2021Cable Installation Start
In early August 2021, offshore installation of the third Hollandse Kust (zuid) export cable, serving the HKZ Beta grid connection, was underway as Van Oord’s Deep Dig-It underwater trencher successfully crossed the busy Rotterdam Maasmond shipping channel with the cable and proceeded offshore towards the recently installed HKZ Beta jacket along the 34 km route.
23 Sept 2020Cable Installation Start
On 23 September 2020, export cable installation began for TenneT’s 1.5 GW Hollandse Kust Zuid offshore grid, with the Van Oord–Hellenic Cables consortium starting to install four 220 kV subsea AC cables that form the two cable circuits linking the Alpha and Beta offshore platforms to shore, including the Hollandse Kust Zuid Beta grid connection.
20 Apr 2020Grid Offer Accepted
Authority: TenneT · Licence: Offshore grid connection agreement for Hollandse Kust Zuid III & IV (HKZ Beta grid connection)
On 20 April 2020, Dutch transmission system operator TenneT and Swedish utility Vattenfall AB signed an agreement for the offshore grid connection of the 700 MW Hollandse Kust Zuid III and IV offshore wind farms to TenneT’s offshore grid, which is implemented via the Hollandse Kust Zuid Beta 700 MW AC grid connection system.
2 Dec 2019Procurement Other
On 2 December 2019, UK‑based First Subsea Limited won a contract from the Van Oord–Hellenic Cables consortium to supply cable protection systems (CPS) for the Hollandse Kust Zuid export cables, including cross‑over protection. These CPS solutions support and protect the 220 kV export cable systems serving both the Alpha and Beta grid connections, thereby contributing to the integrity of the HKZ Beta export route to shore.
27 Jun 2019Substation Supplier Selected
On 27 June 2019, Dutch transmission system operator TenneT awarded a contract to UK‑based Petrofac Limited for the construction of the 700 MW Hollandse Kust Zuid (HKZ) Beta high‑voltage alternating current (HVAC) offshore platform. The Petrofac contract covers delivery of the HKZ Beta offshore transformer substation, a core asset of the HKZ Beta grid connection linking the Hollandse Kust Zuid III & IV wind farms to the Dutch onshore grid.