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 28 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.
Being world-leading high-voltage cable manufacturer, we have extensive knowledge and experience across a range of applications including offshore wind farm connections and we already had received large orders from TenneT. We were selected for the mission in 2012.