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When completed in 2011, BorWin1 was the largest and most remote offshore wind farm in the world. It was also the first HVDC grid connection from an offshore wind farm. The connection of the was made possible through Hitachi Energy’s leading HVDC Light® technology.

BorWin1 wind farm consists of 80 wind turbines, each with a generating capacity of 5 MW. Located 125 kilometers off the German mainland in the North Sea, the HVDC system has the capacity to deliver up to 400 megawatts (MW) of carbon-neutral electricity to the German power grid.

Hitachi Energy was selected by the German transmission system operator (TSO), TenneT  to supply a complete HVDC Light solution to connect the wind farm to the AC onshore power transmission network.

Hitachi Energy HVDC Light VSC technology is compact and weighs less than alternative transmission systems, which are important features for offshore platform design and construction. Furthermore, the technology has independent active/reactive power control and islanding operation capability, which is important for the start-up of offshore wind power plants.

Hitachi Energy was responsible for system engineering including design, supply and installation of the offshore converter, sea and land cable systems and the onshore converter. Cables were laid underwater and underground to minimize environmental impact. 

Map for NordLink project, from Tonstad in Norway to Wilster in Germany
Illustrated overview for NordLink project
Main data
Commissioning year: 2011
Power rating: 400 MW
No of circuits: 1
AC Voltage: 170 kV (Platform BorWin alpha),
380 kV (Diele)
DC Voltage: ±150 kV
Length of DC underground cable: 2 x 75 km
Length of DC submarine cable: 2 x 125 km
Main reason for choosing HVDC Light®: Length of land and sea cables
Application: Offshore wind connections
BorWin Alpha
BorWin Alpha
BorWin Alpha
BorWin Alpha
Diele HVDC station
Diele HVDC station

BorWin 1 leaflet

BorWin1 - Transmission project