Rio Tinto will invest US$1.2 billion (CA$1.7 billion) to modernise its Isle-Maligne hydroelectric power plant in Alma, Quebec, originally commissioned in 1926. The project marks the company’s largest investment in its hydroelectric infrastructure since the 1950s.
The upgrade is aimed at supporting Rio Tinto’s low-carbon aluminium production in the Saguenay–Lac-Saint-Jean region and maintaining long-term operations. The company said the project will help ensure a more efficient and reliable supply of renewable energy to its smelters, casting houses, and other facilities.
More than 300 workers are expected to be involved at the site during peak construction, with the project scheduled to run through 2032. Planned work includes the replacement of eight turbine-alternator groups, refurbishment of water intakes and hydraulic passages, construction of a new extension and mechanical workshop, and upgrades to electrical and mechanical systems. The spillway will also be modified to operate reliably in winter.
Sébastien Ross, Managing Director of Rio Tinto Aluminium’s Atlantic Operations, said: “The Isle-Maligne hydroelectric power plant has been a strategic asset for Rio Tinto for 100 years, drawing on the expertise and dedication of multiple generations of employees and business partners. This major investment to modernise our facilities will ensure the long-term future and competitivity of our low carbon aluminium production in Quebec for decades to come for our Canadian and American customers.’’
The new funding is in addition to previously announced projects valued at US$183 million (CA$252 million), which include refurbishment of butterfly valves and work on two other turbine-alternator groups at the facility.
Rio Tinto operates seven hydroelectric plants in Quebec and British Columbia, making it one of Canada’s largest private producers of hydroelectricity. An eighth facility powers its iron ore operations in Sept-Îles, Quebec.
