A symbolic cut of the spade was the starting signal for the elimination of the bottleneck within the Swiss as well as the whole European transmission system, which is the power line in the Engadin Valley between Pradella and La Punt. To enhance the existing line with a length of 49 km, TSCNET shareholder Swissgrid, the Swiss transmission system operator (TSO), appends an additional 380kV circuit. Swissgrid also modernises the Pradella substation by substituting the old overhead station with a 380kV gas insulated substation.
The construction projects in Engadin are part of “Strategic Grid 2025”, Swissgrid’s demanding grid modernisation and expansion plan. They will increase grid stability and supply security in Switzerland. By providing capacities for the transmission of electricity from Grisons hydropower and by reinforcing interconnections to Italy and Austria, the building measures have beyond that a considerable European dimension. Preparatory works for the line upgrade started in the summer of 2017 and the commissioning of the expanded power line is expected in autumn of 2021. The new Pradella substation will probably be connected to the grid in 2020.
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