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Dörpen HVDC landstation of DolWin1, Germany
Customer Success Story


DolWin1 is the first offshore HVDC grid connection in the DolWin cluster. It connects three wind farms in the North Sea to the German transmission grid.

The HVDC system has the capacity to integrate 800 megawatts (MW) of clean offshore wind power into the German transmission grid, enough to supply around one million households with carbon-neutral energy.

The DolWin1 grid connection is part of Germany’s ambitious energy tranisition roadmap, called “Energiewende”, which foresees the generation of more than 15 gigawatts (GW) from offshore wind by 2030. 

The DolWin1 offshore wind connection was supplied by Hitachi Energy to the German transmission system operator (TSO) TenneT, The ground breaking 800 MW HVDC Light® transmission system connects offshore wind farms located in the North Sea DolWin1 cluster to the German national grid. 

The wind farms is connected with AC cables to an HVDC Light® converter station installed on an offshore platform in the North Sea. The turbine-generated power is transformed here and transmitted via a 75-km long DC subsea cable, then a further 90-km long land cable to an onshore HVDC converter station at the grid connection point of Dörpen West/Heede.

The HVDC Light® system has a total capacity of 800 MW at ±320 kV, and  is ideal for connecting remote wind farms to mainland networks without distance limitations or constraints on the grid. The HVDC Light system used offers advanced stabilizing capability benefitting both the AC-network and the windfarm.

Hitachi Energy’s scope covered the overall project responsibility and system engineering including design, supply and installation of the offshore converter station, sea and land cable systems and the onshore converter station. Heerema has designed and built the platform. The usage of underground cable systems minimized environmental impacts.

Main data
Commissioning year: 2015
Configuration: Symmetrical monopole
Power rating: 800 MW
Direct voltage: ±320 kV
Application: Offshore wind connections