The project differs from most HVDC systems in that one of the two converter stations is built on a platform in the sea.

HVDC has been chosen for most of the grid connections because the relatively long distance involved – both from the wind park to shore and from the shore to the nearest suitable connection point to the onshore grid - makes conventional alternating current transmission uneconomic.

One converter is provided at each end of the link with a DC voltage of ±250 kV and a transmission capacity of 576 MW.

The offshore converter is located on the HelWin Alpha platform, which was built by Nordic Yards in Warnemünde.

[2] Commissioning was completed in January 2015[3] and the project was handed over to TenneT in February 2015 [4] although at the time of hand-over, only 288 MW of wind power was connected to the converter station [5]