Offshore grid connection, Nordergründe

The Nordergründe wind farm, located in the North Sea off the coast of Germany, is part of Energiewende, the German government´s strategy to increase the share of renewable energy in the national energy mix. At the substation Inhausen, north of Wilhelmshaven, the power generated by the 18 offshore wind turbines is fed into the 220 kV (kilovolt) grid. 

The wind farm has a capacity of 111 MW (megawatt), which is enough to cover the electricity needs of more than 100,000 households on the mainland. The energy generated by the wind farm enables the replacement of fossil fueled power generation and reduces CO2 emissions by up to 500,000 tons per year. 

The substation of the wind farm is situated less than 8 kilometers from the coast. Considering this as well as the installed capacity, the Dutch-German transmission grid operator TenneT, responsible for connecting offshore wind farms in the North Sea to the high voltage grid onshore, realized that the most efficient method to connect the wind farm, from both technical and financial perspectives, was an AC (alternating current) grid connection. This also called for an extension of the substation. 

The project scope included the design, engineering, supply and installation of the 155 kV underground and submarine XLPE AC cable system, the onshore and offshore shunt reactors and the extension of the existing 220 kV substation. 

Cable system design and manufacturing of 3x4 km of single-core HVAC underground XLPE cable and 26.5 km of 3-core HVAC submarine XLPE cable with integrated fiber optics

32 km

155 kV cable system and substation extension resulting in a 111 MW power rating

2012 - 2017

TenneT Offshore GmbH

North Sea, Germany



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