Projects

Meeting green energy needs with TenneT and the DoIWin Epsilon Converter

Built in Singapore, completed in Norway, and installed in the North Sea, DolWin epsilon brings offshore wind energy to the German grid, supporting a clean energy future.

Key information

Client TenneT

Location Singapore, Norway, Germany

Project type Energy and natural resources

Services Controls and performance

Project timeline 2022 - Ongoing

The DolWin epsilon converter station (an solid, yellow structure) floating in the sea.

Contact

John Fowlie

Regional Director, Energy and Natural Resources

How do you bring 900 MW of wind energy to shore?

DoIWin epsilon is the offshore converter platform that sits at the centre of the DoIWin5 grid connection system. Located in the North Sea, 100 km off the German coast, the platform converts electricity from offshore wind farms and delivers it to the grid.

A critical part of Germany’s electricity network, DoIWin5 strengthens grid resilience and supports the country’s shift to low-carbon power as it targets climate neutrality by 2045.

900 MW
clean power

Enough electricity for
1.1 million homes.

600 km
grid link

Offshore wind energy connections
to Germany's network.

Lower-impact design

Gravity-based foundation
minimises marine impact.

Offshore
at scale

82m long, 73m wide,
weighing over 23,000 tonnes.

Independent oversight

Clear forecasting, transparency
and early risk signals.

Project story

Keeping momentum across continents

In 2022, TenneT appointed us as their independent schedule assurance partner, building on our experience with major clean energy infrastructure projects, including the Hollandse Kust Zuid grid connection.

We mobilised quickly, setting up a project controls team in Singapore to support the build. Their knowledge of Asian fabrication yards was key. The team reviewed progress in detail, highlighted the biggest risks and helped tackle them early. As the build continued, we monitored the supply chain, providing clear forecasts and early warnings whenever pressure began to show.

When the 73m-wide platform was ready, it travelled more than 13,000 nautical miles to Haugesund, Norway, for final equipment installation. There, we introduced a data-driven dashboard that gave the whole team a live view of progress.

By keeping information clear and teams aligned across locations, we helped TenneT move a complex offshore asset from fabrication to installation.

Powering a greener future

Sustainability is at the centre of the DoIWin epsilon platform design. Built on a gravity-based foundation, it reduces the impact on the North Sea marine environment.

As of 2025, the offshore converter station delivers 900 MW of zero-carbon electricity – enough to power more than one million homes – and supports Germany’s target to generate 80% of its electricity from renewables by 2030.