DolWin6

On the associated offshore platform DolWin kappa, the three-phase current generated by the offshore wind farms is converted into direct current and transported to Hilgenriedersiel on the mainland by an approximately 45 kilometre long sea cable. From the landfall in Hilgenriedersiel the electricity is transmitted to Emden via another 45 kilometre land cable. Here, TenneT is building a converter station and a transformer station to convert the direct current back into three-phase current and feed it into the power grid onshore.

Like most of the offshore grid connection systems linking wind farms in the Western part of the North Sea to the onshore grid the cable route of DolWin6 leads across the island of Norderney. In order to protect the sensitive nature in the Wadden Sea National Park and to ensure the integrity of the dykes TenneT carried out horizontal directional drillings with a length of up to 1.300 metres on the island. TenneT has pulled protective conduits into the bore holes, in which the DolWin6 sea cables were pulled in.