The Canadian Nuclear Safety Commission (CNSC) has extended Ontario Power Generation’s (OPG) licence for the Darlington Nuclear Generating Station (DNGS) by two decades, authorising operation until 30 November 2045. This marks the longest nuclear operating licence granted in Canada, reflecting a significant vote of confidence in both the facility and its operator.
The decision follows a rigorous two-part public hearing process, incorporating submissions from OPG, CNSC staff, and 79 intervenors. The Commission concluded that OPG maintains the qualifications necessary to carry on its licensed activities without changes, but imposed two key conditions: comprehensive performance updates and sustained engagement with Indigenous Nations and communities throughout the licence period.
DNGS, comprising four Candu reactors with a total output of 3,512 MWe, is currently undergoing its first major refurbishment since operations began in 1990. Units 1-3 are already operational post-refurbishment, while unit 4 is on track for completion in early 2026, ahead of schedule and within budget, despite challenges posed by the COVID-19 pandemic and inflation. The refurbishment involved replacing major components, conducting inspections, and implementing modifications to enhance safety and reliability.
This extended licence term could signal a shift in Canada’s approach to nuclear energy, potentially encouraging other operators to pursue longer-term licences. It also underscores the importance of refurbishment projects in extending the lifespan of existing nuclear facilities, a trend likely to gain traction as countries grapple with energy security and decarbonisation goals.
Nicolle Butcher, OPG President & CEO, hailed the decision as a testament to the station’s strong performance and the proficiency of its workforce. “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,” she stated. “Under this licence, Darlington will continue to safely and reliably produce electricity to help meet Ontario’s energy needs for decades to come.”
The decision may also influence global nuclear energy policies, particularly in countries with ageing nuclear fleets. As the world increasingly turns to nuclear power as a low-carbon energy source, the Darlington case study could provide valuable insights into the feasibility and benefits of long-term licence extensions coupled with refurbishment. However, the onus remains on OPG to deliver on its commitments, particularly in engaging with Indigenous communities and maintaining the highest safety standards.