The Canadian Nuclear Safety Commission (CNSC) has renewed Ontario Power Generation’s (OPG’s) licence for the Darlington Nuclear Generating Station (DNGS) for a 20-year term. This decision authorises OPG to operate DNGS until 30 November 2045, making it the longest nuclear operating licence granted in Canada.
The current licence expires on 30 November 2025.
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In making its decision, CNSC said it considered submissions from OPG, CNSC staff and 79 intervenors during a two-part public hearing. The Commission concluded that OPG remains qualified to carry on the activities that the renewed licence will authorise with no changes to OPG’s licensed activities.
However, the decision required OPG to provide two comprehensive performance updates to the Commission on the conduct of its licensed activities. It also includes a new licence condition that requires OPG to continue its engagement with Indigenous Nations and communities throughout the licence period.
DNGS comprises four Candu reactors with a total output of 3,512 MWe. Units 1-3 are currently operating and refurbished while unit 4 is still undergoing refurbishment. Candu units are pressurised heavy water reactors designed to operate for 30 years before refurbishment.
The Darlington Refurbishment Project began in 2016 and is now nearing completion earlier in 2026 than its original schedule and on budget, despite the COVID-19 pandemic and inflation impacts. During refurbishment, the team replaced major components, completed inspections, and introduced modifications to improve the station. OPG said this will ensure safe and reliable operation of the station throughout the licence term and beyond.
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By GlobalData“The longest-ever licence term for a Canadian nuclear station reflects the strong performance of the Darlington station, the proficiency of our highly skilled workers, and OPG’s continued commitment to safety and operational excellence,” said Nicolle Butcher, OPG President & CEO. “Under this licence, Darlington will continue to safely and reliably produce electricity to help meet Ontario’s energy needs for decades to come.”
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