Offshore wind

E.ON Netz is using an aluminium underground cable from Nexans (Euronext: NEX) in the expansion of its grid infrastructure for wind energy.

The German company has launched a 9000 MW infrastructure project with 5.5-km long 110-kV underground cabling as the first stage of grid expansion on the west coast of Schleswig-Holstein, on Germany’s north coast.

In the administrative district of Dithmarschen, Nexans has installed a double circuit 110-kV underground cable system for E.ON – the first of its kind for a German customer – with a total length of around 5.5 km and an order volume of € 4m.
Offshore wind connections
The section that has now been connected up is part of the concept of the federal state government of Schleswig-Holstein to transport wind power electricity inland along the coast in a 20-km wide corridor via underground cables. As part of the energy turnaround, E.ON Netz has embarked upon an infrastructure project that will enable a future feed-in of 9000 MW of electricity from offshore wind farms into the 380-kV transmission grid along the west coast of Schleswig-Holstein.

The underground cable that has now been taken into operation has a cross-section of 2500 mm². The transmission capacity of the cable system is 360 MW – enough power to supply the three large cities of Flensburg, Kiel and Lübeck with electricity.

As part of the cable installation work, E.ON has also started to modify the grid structure, adding a new transformer substation in Dieksanderkoog and upgrading the substation in Marne. The planning and construction work for the Nexans underground cable between Dieksanderkoog and Marne/West was completed in a record time of two and a half years, with the entire cable system taking just six months to install, including underground work.

In an interview conducted with the newspaper “Norddeutsche Rundschau” on the occasion of the first section of the 110-kV line being taken into operation, Dr Robert Habeck – Schleswig-Holstein‘s Minister for Energy Turnaround, Agriculture, Environment and Rural Affairs – compared the necessity for this gigantic infrastructure project with the tasks involved in the reconstruction of East Germany after reunification.

For more wind power generation news