The Innertkirchen substation in the Swiss canton of Bern is an important hub of the national transmission system. As the old 220kV open air switchgear at Innertkirchen is somewhat outdated, TSCNET shareholder Swissgrid, the Swiss transmission system operator (TSO), replaces it with a 380kV gas-insulated switchgear (GIS). The substation modernisation is not only important for the regional long-term security of electricity supply, but also for ensuring the transmission of green energy from hydropower plants in the cantons of Bern and Valais to the centres of the Mittelland.
The conversion work started with a symbolic turn of the sod on 15 May. Since the building for the new GIS will be erected next to the existing outdoor switchgear, the operation of the substation can be fully maintained during the construction period. Investments for the entire project amount to around CHF33m, and commissioning of the new facility is scheduled for mid-2021.
> See Swissgrid media release, in German (html)