Milestone for Berlin's energy future

A special highlight: the cutting wheel weighing around 20 tons was successfully lifted out of the target shaft - a fitting way to celebrate the breakthrough. High-ranking guests such as the Governing Mayor Kai Wegner and representatives from 50Hertz, Elia Group and Implenia praised the project as a milestone in the energy transition.
"The new cable diagonal stands for a stable, efficient power supply and brings us a good deal closer to our goal of climate neutrality," explained Kai Wegner, Governing Mayor of Berlin. "A strong signal for the security of supply in Berlin - and for the modernization of our electricity infrastructure," emphasizes Stefan Kapferer, CEO of 50Hertz. And Bernard Gustin, CEO Elia Group, adds: "A project of European significance - because security of supply is crucial for a sustainable future."
Henning Schrewe, Head Civil & Special Foundations, Implenia Germany, is proud: "A challenging project under urban conditions, which we implemented reliably with our team. We are proud to have contributed to the success of this complex project with our expertise in tunnel construction and other disciplines, such as civil engineering and foundation engineering - many thanks to 50Hertz for their trust and partnership.
And of course, very importantly:
A big thank you and congratulations to everyone involved at Implenia -
Whether above or below ground!
The cable diagonal project
As part of the grid reinforcement of the 380 kV Berlin cable diagonal, 50Hertz Transmission GmbH (50Hertz) is planning to build a new underground 380 kV line between the Rudolf-Wissel-Brücke end pylon and the Mitte substation. The new facility will serve to increase transmission capacity and will replace the existing facility upon completion.
The 6.7 km long tunnel will be divided into three successive sections from west to east by four shaft structures. The tunnel begins on the site of the end pylon at the Rudolf-Wissel Bridge and leads via the intermediate shafts at the Charlottenburg substation and the Tiergarten park to the end shaft at the Mitte substation.