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).
Offshore wind from Lower Saxony
About the project
Nordergründe is the third project within the twelve nautical mile zone of Lower Saxony for which TenneT has implemented a three-phase grid connection. This is both technically and economically the most efficient solution, as the Nordergründe wind farm is only around 30 kilometres from the coast. The 155 kilovolt connection has a total length of 32 kilometers and can transport up to 111 megawatts (MW) of clean wind power. The grid connection point for the Nordergründe offshore project is the Inhausen transformer station north of Wilhelmshaven, which was extended for this purpose in 2012. Here the electricity is transformed to 220 kV and fed into the 220 kV transmission grid.
TenneT had already completed the installation of the cable in summer 2016. Since then, the end of the offshore cable in the wind farm area 15 kilometres east of the island of Wangerooge has been ready to move into the wind farm's transformer station. Due to the insolvency of the platform builder, the platform was not erected until September 2017 and TenneT was now able to pull the submarine cable from the monopile, the foundation foundation, into the platform. This was followed by numerous tests and further installation work in preparation for the commissioning of the offshore grid connection. The three-phase connection has been in operation since November 2017.