The Daxlanden substation near Karlsruhe is an important node in the transmission grid of TransnetBW, the German transmission system operator (TSO) from the federal state of Baden-Württemberg. It is also the central link between two 380kV grid reinforcement projects included in the German National Grid Development Plan for Electricity. To prepare the substation for its future tasks, the TSCNET shareholder began with the upgrade and expansion of Daxlanden at the beginning of November.
The preparatory works will be completed in spring 2021, after which the TSO will start to replace the existing 380kV outdoor switchgear with two new gas insulated switchgears (GIS). For the Daxlanden GIS facilities, the TransnetBW has opted for the so-called Clean Air technology, which exclusively uses processed air as an insulating medium instead of sulfur hexafluoride (SF6). The greenhouse effect of the switchgear is thus radically reduced. Alongside this, the 220kV line between the Daxlanden and Eichstetten substations will be substituted by a 380kV line. The first switchgear is scheduled to be commissioned in 2024 and the second in 2027. The entire installation and grid connections are expected to be completed in 2030.