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Windtech International July August 2024 issue






In East Frisia, Germany, groundwork has begun for the offshore grid connections DolWin4 and BorWin4. Initially, the necessary horizontal drilling will be conducted between the North Sea coast and Emden. Amprion has commissioned the construction companies De Romein and Max Streicher to carry out the work on the approximately 43-kilometre section.

Amprion connects offshore wind farms to the power grid with DolWin4 and BorWin4. The cables end in Lingen and run through East Frisia from Hilgenriedersiel via Lütetsburg, Norden, Osteel, Marienhafe, Upgant-Schott, Wirdum, and Hinte to Emden. The groundwork in this section will begin next week, simultaneously from the north and south. Initially, De Romein and Max Streicher will construct a protective pipe system for the cables, which will later be installed.

In the coming weeks, the focus will be on sections where protective pipes are laid using horizontal drilling. This construction method is used, for example, when crossing infrastructure or bodies of water. Amprion will need space for the construction site setup only at the start and end points of such sections. A total of six drilling rigs will be in operation simultaneously.

From mid-year, the areas between the drillings will be successively connected. Two trenches will be dug with excavators, each containing two protective pipes for the cables. Amprion will implement a proven soil protection concept: the different soil layers will be removed separately, stored, and then refilled in the original order. The groundwork between the coast and Emden will continue until mid-2026.</>

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