IN Brief:
- Cadeler has installed the first complete monopile foundation at Ørsted’s 2.9GW Hornsea 3 offshore wind farm.
- The installation is the first of 197 monopile foundations within Cadeler’s transport and installation scope.
- The milestone starts a major offshore construction phase for one of the UK’s largest future renewable generation assets.
Cadeler has installed the first complete monopile foundation at Ørsted’s Hornsea 3 offshore wind farm, marking the start of a major offshore foundation installation phase for the 2.9GW UK project.
The first installation forms part of Cadeler’s wider transport and installation scope, which covers 197 monopile foundations. Hornsea 3 is being developed by Ørsted and is expected to become one of the world’s largest offshore wind farms once complete.
Cadeler’s purpose-built A-class vessel Wind Ally installed the first monopile, while Wind Orca handled secondary steel installation. Commissioning work on the foundation was completed through a wider offshore team, with the service operation vessel ESVAGT FROUDE also involved in the completion phase.
Behind the first foundation sits a large marine and engineering programme covering component fabrication, port logistics, vessel planning, installation sequencing, lifting operations, and offshore completion work. Each monopile must be delivered, positioned, installed, checked, and prepared for later turbine and electrical packages.
Cadeler has published further details on the project through its Hornsea 3 installation update.
Although foundation installation sits before turbine erection and electrical energisation, the work directly shapes the pace of the wider offshore programme. A project of Hornsea 3’s scale requires foundation installation, secondary steel, array cable works, offshore substation activity, export infrastructure, and grid connection schedules to move in a controlled sequence.
The use of XXL monopiles also reflects the changing scale of offshore wind construction. Larger turbines and deeper sites have pushed foundation dimensions upward, increasing demand for specialist vessels, heavy handling systems, upgraded port facilities, and more sophisticated marine coordination. Installation contractors now have to deliver repeatable foundation campaigns across assets measured in gigawatts rather than hundreds of megawatts.
Electrical delivery depends on the same programme discipline. Array cables, offshore substations, export cables, reactive compensation, control systems, protection settings, and commissioning tests must all follow the physical construction sequence without creating bottlenecks between packages. A delay in foundations can move later work; a delay in offshore electrical systems can leave installed turbines waiting for export capacity.
Comparable pressure is visible across Europe. German offshore build-out is advancing through large electrical infrastructure packages, including Nordseecluster offshore substations, where high-voltage equipment and grid interface works are central to the construction programme. The offshore wind supply chain is no longer just a question of turbine manufacturing. It is an integrated civil, marine, electrical, and grid delivery system.
Hornsea 3 sits within a UK project pipeline that is moving from consent and procurement into physical delivery. That shift increases demand for installation vessels, high-voltage equipment, skilled electrical labour, commissioning teams, and long-lead grid components. With new offshore wind consents also progressing, the same specialist resources will be needed across several major projects.
The first monopile does not determine the final delivery date, but it starts the visible offshore phase of a project that will now be judged by construction throughput. Maintaining the rate of foundation installation, aligning follow-on work, and keeping grid-facing systems on schedule will be central to Hornsea 3’s progress toward full generation.