Denmark’s largest offshore wind farm sees first foundation installed

The installation of the first monopile foundation at the Thor offshore wind farm marks a significant milestone for Denmark’s energy landscape. Spearheaded by RWE, the 1.1 GW project is set to become Denmark’s largest offshore wind installation, located 22 kilometers off the country’s west coast in the North Sea. With a capacity to supply power to over one million Danish households, Thor is a strategic infrastructure project aligned with Denmark’s climate ambitions and Europe’s broader renewable energy agenda.

RWE deploys heavy-lift vessel for monopile installation

Using the heavy-lift installation vessel Les Alizés, RWE has begun deploying monopile foundations that will anchor the wind turbines to the seabed. Each monopile stands roughly 100 meters tall and weighs up to 1,500 metric tons, highlighting the immense engineering effort behind this phase. The installation process involves precise positioning and hydraulic driving to embed the monopiles into the North Sea floor. Les Alizés can transport five monopiles per trip, which reduces transit time and enhances operational efficiency.

The monopiles are fabricated to endure extreme offshore conditions and represent a significant investment in long-term marine infrastructure. Their successful installation provides the foundation for the next stages, including mounting transition pieces and laying inter-array cables.

Sustainable construction sets new benchmarks for offshore projects

Sustainability has been integrated into the Thor project from its inception. Of the 72 Siemens Gamesa SG 14-236 DD turbines planned, 40 will feature fully recyclable rotor blades. This marks a global first at this scale. In addition, 36 turbines will use CO₂-reduced steel towers, helping to reduce emissions across the manufacturing and construction phases. The project also incorporates reused monopile hard covers, promoting resource efficiency and aligning with circular economy principles.

Beyond climate benefits, the Thor project is also delivering local economic value. RWE has committed to creating between 50 and 60 full-time roles at the Port of Thorsminde, which will serve as the project’s operations and maintenance base. These roles will cover technical, logistical, and management functions, and are expected to generate additional economic activity in the region.

The port itself is undergoing infrastructure upgrades to handle the scale and complexity of the equipment involved. These improvements are designed to leave a lasting benefit for future offshore wind projects operating out of the same region.

Thor wind farm targets full operations by end of 2027

The installation of the first foundation begins a carefully sequenced construction schedule. Foundation work will continue through 2025, with turbine installation planned for 2026. RWE has stated that the project remains on track for full operation by the end of 2027. The Thor wind farm supports Denmark’s target of achieving 100 percent renewable electricity by 2030.

Sources:
Energy Global article on Thor Wind Farm