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Nexans supplies 5.5-km aluminum cable for German grid infrastructure

Nexans reports that it has provided the aluminum underground cable used for a 9000-MW infrastructure project that employs a 110-kV underground cabling as the first stage of grid expansion on the west coast of Schleswig-Holstein.

A press release said that the customer, E.ON Netz, required the installed 5.5 km cable, valued at about four million euros, to expand its grid infrastructure for a wind energy project. Nexans, it said, installed a double-circuit 110-kV underground cable system for E.ON that it described as "the first of its kind for a German customer." The section, it said, has been connected as 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, it said.

The 110-kV cable system is the first milestone in the grid expansion concept for Schleswig-Holstein, the release said. "I am really pleased that this cable, which is the first of its cross-section to be installed in Germany, is making a contribution to the energy turnaround", said Wolfram Flebbe, project manager at Nexans Deutschland, at the switching-on ceremony for the cable system.

The release noted the following. The cable, the first such one that Nexans has installed in Germany, was installed at a depth of around 1.75 m in PE tubes, between Dieksanderkoog and Marne. It has a cross-section of 2,500-sq mm, and while it has a slightly larger circumference than a comparable copper cable, it is lighter and more cost-effective overall. The transmission capacity of the cable system is 360 MW, enough power to supply the cities of Flensburg, Kiel and L├╝beck 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.

E.ON Netz's Andreas Fricke said that the west coast wind energy power line project known as "Weststromtrasse." will help to take the strain off the grids. He noted that in Dithmarschen alone, some 1000 MW of wind energy currently being generated cannot always be fed into the grid. A government representative, Dr Robert Habeck, said likened the need for the extra transmission capacity with the reconstruction of East Germany after reunification.

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