HelWin1

HelWin1

It has been in operation since February 2015 and runs 85 kilometres from the Helwin alpha converter platform on the lake side to the landing point near Büsum. From there it runs over 45 kilometres of land cable to the converter station and the transformer station in Büttel. Along with BorWin2, HelWin1 is the first major project to be implemented by TenneT, which enabled more than one offshore wind farm to be connected to the power grid.

The heart of this network connection, the offshore converter platform HelWin alpha, plays a special role: It acts as the parent platform for HelWin beta, the sea-side platform for the HelWin2 network connection, which is directly adjacent and connected by a bridge so that HelWin alpha's crew quarters and helicopter deck can be shared.

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 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.