We are primarily tasked with providing power transmission services, system services and facilitating the energy market. Our core tasks follow from our appointment as grid operator under the Dutch 'Elektriciteitswet' (E-wet) and the German 'Energiewirtschaftsgesetz' (EnWG).
Grid connection for 128 offshore wind turbines off the coast of Helgoland
About the project
With HelWin1, TenneT has completed a 130 km long and 576 megawatt (MW) direct current grid connection near the North Sea island of Helgoland. 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.