Commencement of Monopile Production for Hornsea 3 Wind Project at SeAH Wind's Novel British Production Site
The Hornsea 3 offshore wind farm, a 2.9 GW project managed by Ørsted, is set to see the installation of monopile foundations, thanks to a hydraulic hammer supplied by Acteon. This component will play a crucial role in the installation process, which will be carried out by Cadeler under a contract signed in 2023.
Acteon's hydraulic hammer will contribute to the installation of these foundations, which are being manufactured and supplied by SeAH Wind. The South Korean company started commercial production for this inaugural project in late July to early August 2025.
The manufacturing process for the monopiles involves plate preparation, rolling, welding, non-destructive testing, coating, and final assembly. Some of the finished monopiles will be 100 metres in length and weigh over 2,000 tonnes.
SeAH Wind's new facility in the UK is the first UK purpose-built factory for XXL monopile foundations dedicated to the offshore wind industry. The monopiles will be stored and managed at Steel River Quay on the Teesworks site before they are loaded onto installation vessels.
The project also involves key subcontractors, including Mammoet and Glacier Energy, selected by SeAH Wind to support the installation process.
The timeline for the project indicates that Steel River Quay became fully operational for storage and logistics by Q3 2024. The installation contract was signed with Cadeler in 2023, and SeAH Wind picked its installation support contractors in March 2025. Commercial monopile production began around July 30, 2025, with delivery and installation underway from mid-2025 onward.
This coordinated process ensures the timely manufacture, storage, transport, and installation of the monopile foundations for Ørsted’s Hornsea 3 wind farm in the UK. Chris Sohn, CEO of SeAH Wind, stated that this is a monumental occasion for the company.
References: [1] Offshore Wind Journal. (2023). Cadeler secures Hornsea 3 monopile foundation installation contract. Retrieved from https://www.offshorewind.biz/cadeler-secures-hornsea-3-monopile-foundation-installation-contract/
[2] Offshore WIND. (2025). SeAH Wind starts production of monopiles for Hornsea 3. Retrieved from https://www.offshorewind.biz/sea-wind-starts-production-of-monopiles-for-hornsea-3/
[3] Offshore WIND. (2024). Steel River Quay becomes fully operational for Hornsea 3. Retrieved from https://www.offshorewind.biz/steel-river-quay-becomes-fully-operational-for-hornsea-3/
[4] Offshore WIND. (2025). SeAH Wind selects subcontractors for Hornsea 3. Retrieved from https://www.offshorewind.biz/sea-wind-selects-subcontractors-for-hornsea-3/
[5] Offshore WIND. (2025). Hornsea 3 monopile production underway. Retrieved from https://www.offshorewind.biz/hornsea-3-monopile-production-underway/
- SeAH Wind, a South Korean company, is manufacturing and supplying the monopile foundations for the Hornsea 3 offshore wind farm, contributing to the renewable-energy sector and the finance industry.
- The installation of the monopile foundations for the Hornsea 3 project, managed by Ørsted, is being carried out by Cadeler, under a contract signed in 2023, as part of an effort to transition the market towards more sustainable energy sources.
- The monopiles, 100 meters in length and weighing over 2,000 tonnes, are being produced by SeAH Wind in the UK, marking a significant step forward in the finance and energy industries toward a more sustainable future.
