October 2018 saw the start of construction of ALEGrO, the “Aachen Liège Electricity Grid Overlay”, which is the first direct interconnector of the German and Belgian electricity grids. With a transmission capacity of 1,000MW, ALEGrO will increase cross-border electricity flows and, at the same time, supply security in the western German region of Aachen-Cologne. The European Project of Common Interest (PCI) is realised jointly by TSCNET shareholder Amprion, one of the four German transmission system operators (TSOs), and the Belgian TSO Elia. Only a few months after the start, Amprion can already report some great strides in the construction work.
Underground cabling is used for the entire ALEGrO route (approx. 49km in Belgium and 41km in Germany) and two new converters are being installed at each end of ALEGrO at the substations Oberzier in Germany and Lixhe in Belgium. The coordination effort for the German-Belgian power bridge, which crosses numerous roads, waters or forests, is considerable: Explosive ordnance clearance and the demolition of remnants of world war bunkers are daily business, but of course archaeological investigations and nature conservation are also part of today’s construction standard.
Several teams are working simultaneously at different points along the route in Germany, laying cable conduits into which the conductor cables will later be drawn. 5km of the conduit system have already been completed and 25km are currently under construction. At the Oberzier substation, a hall is currently being erected to house the converter technology. Work is also proceeding well in Belgium, and according to current planning ALEGrO should be operational by the end of 2020.