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Offshore Windpark, Konverterstation

Our technology

Maximum performance at sea and on land

In order for the wind power generated at sea to be fed into the transmission grid, the offshore wind farms must be connected to the mainland. This involves a great deal of technical effort and extensive work. For the electricity produced in the North Sea to be transported to consumers, maximum technical performance at sea and on land is required. The individual offshore projects in the North Sea are connected to the power grid using either three-phase or direct current technology. Smaller wind farms near the coast in particular are usually connected directly to the mainland via three-phase power cables.

However, the majority of offshore wind farms are located in the middle of the North Sea and far from the mainland. The distance to the coast is often more than 100 kilometres. TenneT uses direct current cables to ensure that the wind power produced in large quantities can be transported over this distance with as little loss as possible and fed into the extra-high voltage grid on land. With only one positive and one negative pole each, this technology is gentle on nature and allows a narrow route to be built on land.

 

This is how the energy reaches land from the sea

On its journey from the North Sea to the mainland, electricity passes through several stations:

Connection concepts – from alternating and direct current

Converters - the heart of an offshore grid connection

Horizontal boreholes - for crossing under dunes, dykes and other infrastructures

Transmission cables - the right cable for every part of the system