CNSC renews Darlington reactor licence for 20 years

The Canadian Nuclear Safety Commission has renewed Ontario Power Generation Inc.’s power reactor operating licence for the Darlington Nuclear Generating Station for 20 years.

• Main announcement: The CNSC granted a 20-year renewal of OPG’s power reactor operating licence for the Darlington Nuclear Generating Station (announcement dated September 25, 2025, Ottawa). The renewed licence includes a requirement for OPG to provide 2 comprehensive performance updates to the Commission and a new licence condition requiring ongoing engagement with Indigenous Nations and communities throughout the licence period.
• Background and details: The Commission considered submissions from OPG, CNSC staff and 79 intervenors during a 2-part public hearing (linked in the release). The Darlington facility comprises 4 CANDU units totalling 3,512 MW (Units 1–3 operating and refurbished; Unit 4 under refurbishment). The record of decision is available from the Commission Registry at interventions@cnsc-ccsn.gc.ca, and the decision will be posted in both official languages on the CNSC website. Contact for media: media@cnsc-ccsn.gc.ca, Tel: 613-996-6860.