BorWin6

BorWin6 has a total length of approx. 235 kilometres. The starting point will be the converter platform BorWin kappa in the North Sea. There, the three-phase current generated by the wind farm at sea will be converted into direct current and transported to the mainland with an approximately 190 kilometre long sea cable. From the landfall in Büsum, the electricity will be transmitted along 45 kilometres of underground cable to the future converter station in Büttel. In Büttel, three converters for HelWin1+2 and SylWin1 have already been erected and are in operation.

Connecting concept:

BorWin6 is one of the offshore grid connection systems, which TenneT connects directly to the corresponding wind turbines via 66 kilovolts three-phase alternating current (AC) cables. Hence, a transformer station that was previously necessary in each wind farm is no longer needed. Furthermore, 155 kV AC cables are no longer required to connect TenneT's offshore platform to that of the wind farm. This means that the electricity generated at sea is directly fed into the TenneT converter platform. The conversion of AC into direct current (DC) takes place at the converter station. The electricity is transported by submarine cable to shore and then by underground cable to the onshore converter station, where it is converted back into AC and fed into the extra-high voltage grid. Economically speaking, this innovative technology leads to enormous cost savings.