Rio Tinto Isle-Maligne investment in Quebec is now the company’s most significant hydroelectric commitment in over 70 years. The Anglo-Australian miner will inject C$1.8 billion (US$1.2 billion) into modernising its Isle-Maligne power plant, a key pillar of its low-carbon aluminium operations in Saguenay–Lac-Saint-Jean.
The long-awaited overhaul reinforces Rio Tinto’s commitment to renewable energy and sustainable industrial strategy. Once complete in 2032, the facility will deliver enhanced operational safety, efficiency, and renewable power reliability across its Canadian smelters and casting operations.
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Strategic Investment in Low Carbon Aluminium Supply Chain
Built in 1925 and operational since 1926, Isle-Maligne was North America’s first power plant built for aluminium production. Now, nearly a century later, Rio Tinto’s Quebec hydroelectric modernisation ensures that the facility continues to anchor the region’s industrial identity.
The project involves:
- Replacing eight turbine-alternator groups
- Rehabilitating hydraulic passages and water intakes
- Constructing a northern extension and mechanical workshop
- Modernising electrical and mechanical equipment
- Modifying the spillway for winter reliability
At peak, the site will support over 300 jobs, providing local employment opportunities and boosting regional economic development in Quebec. The plant will continue powering Rio Tinto’s low-carbon aluminium production, key to meeting the rising demand for sustainable materials from customers across Canada and the U.S.
Long-Term Competitiveness and Operational Resilience
Sébastien Ross, managing director of Rio Tinto Aluminium Atlantic Operations, emphasized the project’s alignment with long-term industrial strategy:
“This major investment to modernise our facilities will ensure the long-term future and competitiveness of our low carbon aluminium production in Quebec for decades to come for our Canadian and American customers.”
Ross noted that the Isle-Maligne plant has played a strategic role in powering Rio Tinto’s operations for a century, relying on generations of employee expertise and regional partnerships.
The project represents Rio Tinto’s largest single hydro investment since the 1950s, reflecting the increasing importance of renewable self-generation in decarbonizing heavy industry.
Supporting Prior Commitments and Carbon Strategy
The $1.8 billion modernisation builds on previously announced projects worth C$284 million (US$183 million). These include:
- Refurbishment of butterfly valves
- Upgrades to two additional turbine-alternator groups
Together, these initiatives underscore Rio Tinto’s focus on infrastructure resilience and carbon competitiveness. The miner has committed to reducing its global emissions footprint and scaling up in-house renewable energy capacity, particularly in aluminium—a sector under scrutiny for its traditionally high emissions.
A Century-Old Powerhouse Readies for a Low-Carbon Future
The Rio Tinto Isle-Maligne investment marks a pivotal moment in the evolution of industrial hydropower in North America. As demand for low carbon aluminium accelerates, the modernisation ensures that Quebec remains a global leader in green metals manufacturing.
Rio Tinto’s strategic bet on hydropower not only protects regional jobs and assets—it also reinforces the company’s positioning as a climate-aligned supplier in a market reshaped by energy transition.
