As part of the "Naturnahes Aareufer" (NAF – near-natural Aare river bank) and the new factory road to the Vigier Holding AG gravel quarry in Flumenthal, the cabling of the existing 50 kV overhead line into the factory road was planned. For this purpose, a concrete pipe block with seven PE pipes (6 x nominal diameter 150 mm, 1 x nominal diameter 120 mm) and two socket shafts were created. The subterranean crossing of the Siggern using horizontal drilling was a particular challenge.
This adaptation to the construction affected various plots in the municipalities of Flumenthal, Luterbach and Riedholz. For the necessary planning application to the Federal Inspectorate for Heavy Current Installations, it was first necessary to acquire the electricity transmission rights from a total of nine landowners by means of easement contracts, compensate them as well as publicly register and enter them into the land registry. Bouygues E&S EnerTrans Ltd. was able to acquire all rights from the landowners by private contract and then conclude the project professionally, cost-effectively and on time to the satisfaction of all involved.