Land solution on the water

Wind turbines with a uniquely developed cofferdam construction


On the border between land and water, Ballast Nedam has contributed to the replacement of 28 obsolete wind turbines with 24 modern and powerful turbines. For this project, we designed and built the new turbine foundations, realised the park cabling and provided the connection to the substation.

  • 16.000 metres tubular piles
  • 8.000 metres sheet piles
  • 25.000 m3 concrete


The wind turbines are part of the Windplanblauw project, which comprises a total of 61 new turbines. Through the green energy produced by the wind turbines, this project is making a substantial contribution to the Energy Agreement in the province of Flevoland. In this way, Ballast Nedam has contributed to the energy transition with the construction work for Windplanblauw.

The project in brief

The new wind turbines are part of an initiative by SwifterwinT and Vattenfall: a wind farm in the municipalities of Dronten and Lelystad, where 74 existing wind turbines have been replaced by 61 modern turbines with a higher capacity. The wind farm has a total installed capacity of over 335 MW. A total of 37 turbines are placed on land and 24 in the water of the IJsselmeer lake.

The foundations for the 24 turbines in the IJsselmeer have been designed and realised by Ballast Nedam. The new foundations  replaced the 28 wind turbines of the current 'Irene Vorrink' wind farm, which was also built by Ballast Nedam. The 24 wind turbines each generate about 6 Megawatt of power, which is 5,4 Megawatt extra power compared to the old turbines.

Nearshore locations

Project Windplanblauw was located in shallow water, on the border of onshore (land) and offshore (sea). We refer to this location as 'nearshore'. This is where our expertise lies and where we can apply our maritime knowledge, combined with our expertise in building on the land.

Unique cofferdam construction

For this project, Ballast Nedam developed a unique solution for the installation of land-based turbines on water. We combined the upper part of the foundation solution, which is normally used on land, with the lower part of a marine solution. This created a cofferdam construction that formed the basis for the turbine foundations. Through this unique cofferdam construction, we have applied a proven technique.

More information?

Ronald de Geus

Managing Director Ballast Nedam Infra Projects

Ronald grew up in an international environment: the basis of his career in integral projects. From his design and engineering background, he has grown into the project management of large, complex projects.

Business Unit Director Ronald De Geus Ballast Nedam Infra Projects
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