How much does Mont Cenis Base Tunnel cost?
The Mont Cenis (Mont d'Ambin) Base Tunnel is the 57.5 km twin-tube railway base tunnel under the Alps between Saint-Jean-de-Maurienne in Savoie and the Susa Valley in Piedmont, the cross-border core of the Lyon-Turin rail link, built by TELT with France, Italy and EU funding, whose main excavation contracts were awarded in July 2021. TELT's website gives its current cost as EUR 11.1 billion, whereas Wikipedia says EUR 8 billion in January 2018 value, and TELT still announces entry into service in 2032 (updated August 2026).
Published project estimate
€11.1 billion
Approximately $12.54 billion
Cost basis: 2026
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