Rio Tinto has announced a major investment of US$1.2 billion (CA$1.7 billion) to modernize its historic Isle-Maligne hydroelectric power plant in Alma, Quebec, a facility that has been operating since 1926.
This modernization project is a critical step in supporting low-carbon aluminum production in the Saguenay–Lac-Saint-Jean region, reinforcing Rio Tinto’s long-term commitment to clean energy, operational safety, and regional job stability.
The upgrade will enhance the efficiency, safety, and reliability of the plant’s renewable power supply to support aluminum smelters, casting operations, and other local facilities. At its peak, the project is expected to employ around 300 workers, with completion set for 2032.
Key components of the project include:
• Replacing eight turbine-alternator groups
• Rehabilitating water intake systems and hydraulic passages
• Constructing a new extension and mechanical workshop north of the facility
• Upgrading electrical and mechanical equipment
• Modifying the spillway to ensure winter reliability
According to Sébastien Ross, Managing Director of Rio Tinto Aluminium – Atlantic Operations, this investment will ensure the company’s low-carbon aluminum products remain competitive for Canadian and U.S. markets, while strengthening energy independence and environmental responsibility.
This initiative follows previous commitments totaling US$183 million (CA$252 million) for valve refurbishments and upgrades to two additional turbine units at the same facility.
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