Transmission capacity
980 megawatts (MW) of offshore wind power
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BorWin6: Strengthening Germany’s Offshore Wind Grid Connection
As offshore wind capacity across Europe continues to expand, the need for resilient, high-capacity grid connections is more critical than ever. BorWin6 is one of Germany’s most significant offshore grid connection projects, playing a vital role in transporting renewable energy from the North Sea to the onshore transmission network. As an offshore wind energy specialist, IOER has been proud to support this landmark project with expert consultancy and personnel services.
BorWin6 is a 980 MW high-voltage direct current (HVDC) offshore grid connection system developed and owned by transmission system operator TenneT. The project enables electricity generated by offshore wind farms in the German North Sea to be transmitted efficiently to the mainland grid.
At the heart of the system is the BorWin kappa offshore converter platform, where electricity generated offshore is converted from alternating current (AC) to direct current (DC). The power is then transported via subsea and underground cables to an onshore converter station near Büttel, Schleswig-Holstein, where it is converted back to AC and fed into Germany’s high-voltage transmission grid.
BorWin6 is part of TenneT’s established BorWin programme and represents a key step in strengthening offshore grid infrastructure while supporting the long?term transition to renewable energy.
Total route length
Approximately 235 kilometres from offshore platform to onshore converter station
Technology
High‑voltage direct current (HVDC) transmission at 320 kV
Commissioning target
Expected to enter operation in 2027
What Was IOER’s Involvement?
IOER supported the BorWin6 project through its offshore wind consultancy and specialist workforce services, helping ensure safe, compliant, and efficient delivery during critical phases of development and construction.
Drawing on over 15 years of offshore wind experience, IOER contributed expertise aligned with its core service offering, including:
- Offshore wind consultancy, supporting project teams with operational insight, workforce planning, and best‑practice guidance
- Specialist offshore recruitment, supplying qualified and certified offshore wind professionals to meet demanding project requirements
- Operations and maintenance support expertise, helping ensure long‑term asset reliability and performance
- Rapid mobilisation of skilled personnel, accessed through IOER’s global contractor and technician network
These services reflect IOER’s role as a trusted partner to developers, operators, and contractors working on large‑scale offshore wind infrastructure projects worldwide.
The Long Term Benefits of BorWin6
BorWin6 delivers substantial long‑term value to both the energy sector and wider society. By providing a high‑capacity, efficient grid connection, the project:
- Strengthens Germany’s renewable energy infrastructure, enabling large volumes of offshore wind power to reach the national grid
- Supports energy security, reducing reliance on fossil fuels and imported energy sources
- Improves transmission efficiency, with HVDC technology minimising losses over long distances
- Future‑proofs the grid, serving as a foundation for continued offshore wind expansion in the North Sea
By connecting offshore generation directly to the grid using advanced transmission technology, BorWin6 plays a critical role in accelerating Germany’s energy transition while supporting long‑term emissions reduction targets.
Working With IOER on Offshore Energy Projects
Projects like BorWin6 highlight the importance of experienced partners who understand the technical, operational, and human challenges of offshore wind development. At IOER, we combine deep industry knowledge with global recruitment capability to support offshore energy projects at every stage.
If you are planning or delivering offshore wind or grid infrastructure projects and need trusted consultancy, specialist personnel, or operational support, IOER is ready to help.
Contact IOER today to discuss how our offshore energy expertise can support the success of your next project.
