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HelWin1

With HelWin1, TenneT has completed a 130 km long and 576 megawatt (MW) direct current grid connection near the North Sea island of Helgoland.


Location
Schleswig-Holstein, Nordsee
Type
Offshore
Category
offshore
Status
finished
Tags
  • HelWin1
HelWin1

About the project

130 kilometers long and 575 megawatts strong direct current grid connection system

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.

Impressions

  • HelWin1 cable loading Emden

    HelWin1 cable loading Emden

  • HelWin1 cable loading Emden

    HelWin1 cable loading Emden

  • HelWin1 watt cable laying

    HelWin1 watt cable laying

  • HelWin1 SylWin1 HDD Büsum

    HelWin1 SylWin1 HDD Büsum

  • HelWin1 SylWin1 pipe feed

    HelWin1 SylWin1 pipe feed

  • HelWin alpha_ Sailout

    HelWin alpha_ Sailout

  • HelWin alpha

    HelWin alpha

  • HelWin alpha

    HelWin alpha

Contacts

Tim Dampmann

Tim Dampmann

Spokesperson - Projekt Offshore Communication

Further information