Nexans – Saint-Gotthard road tunnel: Nexans to install Switzerland’s longest high-voltage underground line

• Nexans, in partnership with Swissgrid, will install a high-voltage line in a road tunnel, a pioneering project in Europe. 
• Works will begin in 2028 and be completed in 2030.

Paris, May 14, 2025 – Nexans, in partnership with Swissgrid, Switzerland’s national grid operator, will install a high-voltage line in the Saint-Gotthard Road tunnel.

The Saint-Gotthard Road tunnel’s second tube will feature a first: by 2030, it will house an 18 km long high-voltage line, which will replace the existing overhead line across the pass. This new connection will play a critical role in electricity transmission along Switzerland’s north–south corridor.

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