Hollandse Kust West Beta
OperationalOffshore GridNL700 MW220 kV74 km2025
Basic information
8 fieldsAlso Known As
Hollandse Kust (west Beta) · HKW West Beta · HKW-B · Net op zee Hollandse Kust West Beta
Status
operational
Capacity
700 MW
Owners
Project Company
Type
offshore grid
Transmission Model
TSO Build & Own
Website
Supply Chain (3)
Project Timeline (14)
29 Oct 2025Commercial Operations Full Power
On 29 October 2025, TenneT completed the Hollandse Kust (west Beta) 700 MW offshore grid connection, with certification body DNV confirming that the link meets all high-voltage grid standards and is ready for operation. This milestone, delivered five months ahead of schedule, marked grid readiness of the Hollandse Kust West Beta connection that will transmit power from the OranjeWind offshore wind farm to the Dutch onshore grid and concluded TenneT’s series of seven 700 MW offshore grid links in the Netherlands.
27 Aug 2025System Testing
By 27 August 2025, Site Acceptance Tests for the Hollandse Kust West Beta transmission system had been successfully completed, covering two 220 kV export cable systems to shore and the 66 kV interconnector between the Hollandse Kust West Alpha and Beta platforms, thereby confirming grid readiness of the connection for the OranjeWind offshore wind farm.
21 May 2025Construction Other
On 21 May 2025, Heerema completed the offshore construction of the Hollandse Kust West Beta platform by lifting and installing the nearly 4,000‑tonne topside from the H‑406 barge onto the pre‑installed jacket, marking the final offshore construction milestone for TenneT’s 700 MW HKW‑B grid connection.
21 Jun 2024Cable Installation Start
By 21 June 2024, Boskalis had started installing the second nearshore export cable for TenneT’s 700 MW Hollandse Kust (West Beta) offshore grid link, with the cable-laying vessel Giant 7 beginning work close to shore after completion of the first cable and the vessel Ndurance taking over installation further offshore.
21 Jun 2024Offshore Site Preparation
As part of preparations for the Hollandse Kust (West Beta) export cables, Boskalis’s trailing suction hopper dredger Gateway was cutting trenches in the seabed in June 2024 to create the required cable route in the shallow North Sea nearshore area and on the approach to the beach.
May 2024Offshore Construction Start
Offshore construction for TenneT’s Hollandse Kust (West Beta) grid connection effectively started in May 2024, when Heerema’s SSCV Sleipnir installed the 49-metre-long, approximately 2,100-tonne jacket foundation on the seabed and anchored it with piles driven over 50 metres deep for the HKW-B offshore substation platform built by the Equans–Smulders joint venture.
21 May 2024Cable Landfall Complete
On 21 May 2024, the first of two 220 kV AC export cables for TenneT’s Hollandse Kust (west Beta) offshore grid connection was pulled underneath the dunes at Velsen, the Netherlands, completing the landfall pull-in for this cable as part of an installation campaign executed by the Boskalis–Orient Cable consortium.
25 Apr 2024Manufacturing Update
Smulders, working with Sif, completed the loadout of the Hollandse Kust West Beta offshore substation jacket foundation and approximately 900 tonnes of pin piles, up to 79 metres long, from its Vlissingen yard on 25 April, preparing the fabricated structures for offshore installation on TenneT’s grid connection.
14 Dec 2023Procurement Other
Equans/Smulders awarded Heerema Marine Contractors a transport and installation contract for the Hollandse Kust West Beta offshore platform, with Heerema’s heavy-lift vessel Sleipnir engaged to install the jacket and topside as part of TenneT’s 700 MW grid connection.
23 Mar 2022Cable Supplier Selected
TenneT awarded a consortium of Boskalis and Orient Cables (NBO) the Hollandse Kust West Beta export cable contract, under which NBO will design and supply two 65-kilometre-long 220 kV AC export cable systems and a 9-kilometre 66 kV interconnector linking the Hollandse Kust West Alpha and Beta offshore substations to TenneT’s onshore grid at Wijk aan Zee.