The 220-kV Foretaille – Verbois line will be partially cabled along the Foretaille – Renfile section and the existing route will be dismantled. The project is part of the «Axe Stratégique Réseau» (ASR), which pursues urban planning, economic and ecological goals and harnesses synergies with the municipal district heating project and the new motorway connection.

The construction of four 220/220-kV phase-shifting transformers (PSTs) in Verbois, St-Triphon and Riddes, combined with the replacement of two further 380/220-kV transformers in Verbois and Châtelard, will increase exchange capacities with other countries, reduce redispatching costs and increase grid security.

The construction of the new Chavalon substation and the enhancement of the Romanel – St-Triphon line will allow the connection of an end consumer with a capacity of 350 MVA in Chavalon. Flexible solutions and close coordination with the investor will be required to identify the most time- and cost-efficient approach.

This project includes the construction of a new 220-kV substation in Pallazuit in order to handle the growing electricity generation in the area. The installation of two 220/220-kV phase-shifting transformers in Riddes is necessary to optimise the operation of the two 220-kV lines from Riddes to Italy.

The Hauterive substation will be extended and connected redundantly to the 220-kV Mühleberg – Botterens line in order to increase security of supply in the canton of Fribourg.

This project at the Lachmatt substation comprises the modernisation of the 380-kV switchgear and the construction of a new 380/220-kV, 400-MVA transformer. This will increase security of supply in the Basel region, facilitate the control of electricity flows in the transmission grid, and support the increasing cross-border exchange of electricity with Germany and France.

Swissgrid is planning an extra-high-voltage line between the substations at Flumenthal (canton of Solothurn) and Froloo (municipality of Therwil, canton of Basel-Landschaft) in order to strengthen the electricity supply in the greater Basel area and increase redundancy in the grid. The new 220-kV line will replace the existing 145-kV line operated by Industrielle Werke Basel (IWB).

A new 380/220-kV transformer will be installed in the Bickigen substation, and a used transformer will be moved from Bassecourt to Bickigen. This measure will strengthen grid stability and optimise the control of electricity flows in the transmission grid.

The pylons on this line will be strengthened to allow the voltage to be increased from 220 to 380 kV over a length of 106 kilometres. This will increase the transfer capacity between the hydropower plants in the Valais and the consumer centre in Central Switzerland.

The construction of a 220-kV substation in Visp is necessary to cover the growing electricity requirements of the company Lonza. The substation will be connected to the new Chippis – Mörel extra-high-voltage line.

A new 380/220-kV line will be built between Chippis and Mörel and a new 380-kV substation with a 380/220-kV, 600-MVA transformer will be created in Mörel. The construction of this line and the substation is necessary so that the energy generated by the hydropower plants in the Valais can be transported to the consumer centres in Central Switzerland and Ticino. As part of the same project, a second 220-kV system will be installed on the existing pylons between Chippis and Stalden.

The existing transformer system in the Gösgen substation will be expanded through the addition of two new 800-MVA transformers. This will involve replacing an existing transformer. The aim is to increase grid stability and improve the controllability of electricity flows in the transmission grid.

The old line will be replaced by a new line along an optimised route. Both systems will be operated at 380 kV in the future. This will increase the transfer capacity between Germany and Switzerland.

The existing transformer system in the Breite substation will be expanded through the addition of two new 800-MVA transformers. This will involve replacing an existing transformer. The aim is to increase grid stability and improve the controllability of electricity flows in the transmission grid.

The construction of a new overhead line route with partial cabling and a voltage increase to 380 kV will eliminate regular grid congestion in Central Switzerland, particularly in the cantons of Aargau, Zurich and Lucerne. The project has already been partially completed. The new routing will reduce the impact on residential areas in particular.

The 150-kV system between Auwiesen and Fällanden will be converted to 220 kV. Increasing redundancy in the transmission grid will improve security of supply in the Zurich area. The ewz high-voltage grid will need to be expanded before the project can be implemented.

Swissgrid is expanding the 150-kV line between Samstagern, Thalwil, Waldegg (Zurich) and Obfelden to 220 kV in stages. New substations will be built in Thalwil and Waldegg, while the substation in Samstagern will be dismantled. Through this expansion, Swissgrid will strengthen long-term security of supply for the city of Zurich and the left bank of Lake Zurich.

The existing transformer system at the Mettlen substation will be expanded through the addition of two new 800-MVA transformers. This will involve replacing an existing transformer, which will be moved to Tierfehd. The aim is to increase grid stability and improve the controllability of electricity flows in the transmission grid.

The 61-kilometre section of line between Innertkirchen (canton of Bern) and Mettlen (canton of Lucerne) will be replaced and the transfer capacity increased. This will strengthen the north-south axis and enable the expansion of hydropower in the canton of Bern.

The 27-kilometre section of line between Innertkirchen (canton of Bern) and Ulrichen (canton of Valais) will be replaced and the transfer capacity increased. This will strengthen the north-south axis and enable the expansion of hydropower in the canton of Bern.

The expansion of the 220-kV line between Airolo and Göschenen with an additional cable system in the Gotthard Road Tunnel will increase the grid capacity of the north-south axis and improve security of supply both in the canton of Uri and in the grid connection of the Göschenen power plant thanks to the redundant grid connection of the Göschenen substation.

An extra-high-voltage line is being bundled with a national road tunnel for the first time. The 220-kV underground line between Göschenen and Airolo, over a length of around 18 kilometres, will harness synergies with the construction of the second Gotthard Road Tunnel and reduce the impact on the landscape.

The new 380-kV line will run through the Valais over the Nufenen Pass as far as Ticino and will be partially bundled with the SBB power line. This will enable SBB and Swissgrid to strengthen the integration of Ticino into their grids (Airolo – Lavorgo grid project). optimise the feed-in of electricity produced by the expansion of hydropower, and also improve the east-west flow of electricity. The project has already been partially completed.

Swissgrid will build a new power line between All’Acqua in the Bedretto Valley and Magadino to replace the old lines and increase the transfer capacity. The project also includes the construction of a new substation in All’Acqua. Once the other regional projects have been completed, it will be possible to remove more than 70 kilometres of existing power lines, relieving pressure on valuable landscapes. This project was developed in cooperation with the regional authorities and infrastructure operators.

The renovation and capacity expansion of the 380-kV line between Lavorgo and Magadino includes the replacement of the existing line. The Gnosca substation is also being rebuilt. The Gorduno, Olivone and Iragna substations will be dismantled. These measures, which were developed in collaboration with the regional authorities and infrastructure operators, will improve grid stability.

The 380-kV Magadino substation will be rebuilt and a 380/220-kV, 800-MVA transformer will be installed. This will strengthen the supply of electricity in the region and optimise the cross-border exchange of electricity with Italy.

The existing transformers in the Soazza substation will be replaced in order to improve grid stability and increase supply capacity.

Two transformers in the Tavanasa substation will be replaced by a new 380/220-kV, 400-MVA transformer. The transformer in the Bonaduz substation will take over the function of one of the old transformers. This measure will improve grid stability and the control of electricity flows in the region.

The Bonaduz substation is being modernised. The construction of two new 380/220-kV transformers will improve grid controllability and redundancy. The modernisation will also play a key role in allowing energy to be transported from the region’s hydropower plants to the consumer centres in Central Switzerland and will facilitate the exchange of electricity with Austria and Italy.

The Principality of Liechtenstein, the Swiss Federal Office of Energy and Swissgrid are examining whether and how the extra-high-voltage line in Balzers can be relocated. The line supplies electricity to the Principality of Liechtenstein and eastern Switzerland.

The construction of this new line connection from the north to the Rüthi substation will enable Swissgrid to improve security of supply in eastern Switzerland and optimise the connection to Austria. The new Rüthi substation has already been completed.