Norderney: BorWin5 Grid Connection

Transmission system operator TenneT is building a 900 MW grid connection from the EnBW He Dreiht wind farm to the converter station in Garrel/Ost. The 320 kV direct current connection strengthens the German supply network. TenneT is building this direct current grid connection with egeplast protective pipes for high and extra-high voltage cables up to 525 kV.

Horizontal drilling protects natural space

In order to achieve the expansion targets for renewable energies in Germany, the connection of offshore wind farms to the supply network is of great importance. One of these offshore connections is BorWin5 – a 230 km long grid connection that connects the EnBW He Dreiht wind farm, north

of Borkum, with the extra-high voltage grid on land. The grid connection point is the Garrel substation in the Cloppenburg area. The submarine cable has a length of 110 km. The underground cable portion is 120 km. For the construction, an ARGE, consisting of the companies Matthäi, Beermann and Matthäi Wasserbau was commissioned by TenneT. The pipeline construction work is carried out by STRABAG on behalf of the ARGE. The offshore connection runs via the island of Norderney. In order to protect the sensitive Wadden Sea natural area and to ensure dike safety, TenneT has opted for horizontal drilling on the island. The high-temperature-resistant Macroduct High-T in 450 x 61.5 mm is used here. It is a protective pipe for high and extra-high voltage cables up to 525 kV, which has increased thermal stability to withstand the high thermal stresses. The combination of high flexibility and strength of the PERohres used offers optimal properties for the implementation of these horizontal drilling.

High demands

Exact timing