Valais Refinery Chimneys Demolished for Tech Future.

The final two chimneys of the former Tamoil Switzerland refinery in Collombey-Muraz were demolished on Thursday as redevelopment efforts continue to transform the industrial site into a future technology hub.

The massive chimneys, each standing approximately 100 metres high and weighing a combined 4,000 tonnes, collapsed within seconds during the carefully planned demolition. Officials described the structures falling “like a house of cards” after controlled explosives were triggered.

The operation required nearly three months of preparation and around 50 kilograms of explosives. Authorities temporarily closed nearby roads and surrounding areas for safety during the demolition process.

According to Stéphane Trachsler, extensive environmental studies, technical reviews, and risk assessments had been conducted since 2024 to ensure the demolition could proceed safely. Field tests were also carried out in 2025 to monitor possible ground vibrations and environmental impact.

The demolition marks another important step in the transformation of the former refinery site, which authorities and developers hope to convert into a centre for new technologies and innovation in the canton of Valais.

Project leaders also confirmed that rubble and construction materials from the demolished chimneys will be recycled and reused in regional construction projects, supporting sustainability efforts linked to the redevelopment.

The refinery site redevelopment is seen as part of Switzerland’s broader shift toward cleaner industries, technological innovation, and modern infrastructure development.