High demand for new transmission grids
The expansion of power transmission grids and the construction of new trunk lines are typically carried out with overhead lines. For this the time and budget plans of the authorities and planners often have to be adapted to the demands of local residents and property owners in laborious and time-consuming procedures. This is particularly true in densely populated regions such as Germany.
For the grid expansion planned in Germany (Grid Development Plan Power 2030, version 2017, 2nd draft), around 2,400 kilometers of new high-voltage direct-current transmission lines (HVDC) are needed, most of which are to be installed as underground cable. The main requirement is to install the cables at a shallow depth and at rigidly defined small distances apart with high precision over the greatest possible distances (up to 2 km).
In the area of non-accessible diameters for the individual installation of underground cables, until now no trenchless construction method has met all the criteria in terms of cost-effectiveness, safety, security and construction time. With the E-Power Pipe® technology, Herrenknecht has developed a new method that closes this gap.