Schiedam, Netherlands [17 July 2025] – HSM Offshore Energy is proud to announce the successful yard completion and delivery offshore of the THOR Offshore High Voltage Substation (OHVS), marking the achievement of three major milestones: the load-out of the jacket, the load-out of the topside, and the sail-away of the jacket and substation, which have now left the Schiedam yard and are en route to its final destination off the Danish coast. Thor is a joint offshore wind project of RWE (51%) and Norges Bank Investment Management (49%).

The THOR OHVS is a critical component of Denmark’s largest offshore wind project to date — the 1,1 GW THOR wind farm — which will be capable to supply more than one million Danish households with clean electricity. Positioned approximately 22 kilometres off the west coast of Jutland, the substation will collect and transform power from 72 wind turbines before transmission to the onshore grid at Volder Søndervang.

Engineering Innovation with Industry-Leading Efficiency

Awarded in 2022, HSM Offshore Energy was entrusted with the full EPCIC (Engineering, Procurement, Construction, Installation, and Commissioning) contract including HV equipment for both the topside and jacket foundation.

• The topside measures 39 x 36 x 18 metres (LxBxH) and weighs approximately 2,600 metric tonnes.
• The jacket measures 40 x 40 x 50 metres (LxBxH) and weighs approximately 2,500 metric tonnes.

Together, these structures represent not only a feat of offshore engineering but also a benchmark for design efficiency. The THOR OHVS features the best power-to-weight ratio in the industry, making it one of the most compact and effective substations of its kind.

This forward-thinking design sets the stage for smaller, lighter, and more reliable offshore substations, contributing to cost-efficient, scalable solutions for the future of offshore wind.

“Delivering the THOR substation from first steel to sail-away has been a highly rewarding and technically complex journey,” said Koen Moons, Project Manager at HSM Offshore Energy. “This achievement reflects the deep dedication, expertise, and teamwork across all disciplines, Partners and Subcontractors. The THOR project demonstrates what’s possible when innovation and integration come together — and it sets a new benchmark for what offshore substations can and should be.”

“That the sail-away of the fully assembled substation for THOR is an important step for us in the project team ,” said Günther Fenle, Project Director for Thor at RWE. “We are looking forward to the installation at sea later this summer and the commissioning of the systems thereafter. ”

About HSM Offshore Energy
HSM Offshore Energy is an integrated solution provider in EPCIC (Engineering, Procurement, Construction, Installation and Commissioning) multi-disciplinary offshore projects. By leveraging engineering know-how and technological excellence, driven by our commitment to a sustainable energy future, we are the contractor of choice for the offshore energy sector.

With our 60 years of offshore experience, we delivered successfully well over 150 projects such as integrated platforms, modules, and jackets for the offshore upstream energy sector. Focusing on High-Voltage Substations, Green Hydrogen Platforms, Gas Production and Processing Modules, Carbon Capturing and Storage infrastructures and its steel jacket foundations.

For media inquiries or further information, please contact communication@hsmoffshoreenergy.com.