HelWin2

This project is the third connection of TenneT in the eastern North Sea. The line runs from the HelWin beta converter station 85 kilometres as submarine cable to the landing point in Büsum and from there 45 kilometres as underground cable to the converter station in Büttel in Schleswig-Holstein.
The offshore converter platform HelWin beta is a subsidiary platform of HelWin alpha, the heart of the grid Connection HelWin1.
There are only about 20 metres between the two platforms. Both platforms are directly connected by a bridge. This means that the helicopter deck and the crew accommodation can be shared for the employees at sea. This is an innovative and cost-saving concept because it makes use of technical and logistical synergies.

Connecting concept

The electricity generated at sea is collected in the wind farm's own transformer station. From there the energy is transported to TenneT’s offshore converter platform via a 155 kilovolts three-phase alternating current (AC) cables. The conversion of AC to direct current (DC) takes place in the offshore converter station. The electricity is then transported by subsea and underground cable to the corresponding land station. Here, the electricity is converted back into AC and fed into the TenneT extra-high voltage grid.