Darlington Nuclear Generating Station
Ontario Power Generation (OPG) owns and is licensed to operate the Darlington Nuclear Generating Station, located in the municipality of Clarington, on the north shore of Lake Ontario.
OPG currently holds a 10-year operating licence for the Darlington NGS, which expires on November 30, 2025.
OPG also operates a nuclear waste management facility at the station through a waste facility operating licence.
The CNSC has full-time staff onsite who perform inspections to evaluate operations and to verify compliance with regulatory requirements and licence conditions.
Photo courtesy of Ontario Power Generation
| Location: | Clarington, Ontario |
|---|---|
| Licensee: | Ontario Power Generation |
| Reactor type: | CANDU (CANada Deuterium Uranium) |
| Vendor: | Atomic Energy of Canada Limited |
| Number of units: | 4 reactors |
| Installed capacity: | 3,512 MW |
| Status: |
Units 2, 3 and 4: Operating Units 1 : Refurbishment |
| Licence issued: | January 1, 2016 |
| Licence expires: | November 30, 2025 |
| Start of commercial operation: | Between 1990 and 1993 |
| Licensing documentation: | Request a copy of Darlington Nuclear Generating Station licence and licence conditions handbook by email at cnsc.info.ccsn@cnsc-ccsn.gc.ca |
| Facility website: | Ontario Power Generation |
Latest news
Commission proceedings
The Commission is an independent administrative tribunal set up at arm’s length from government, without ties to the nuclear industry. Use the links below to find documents related to Commission meetings or hearings.
- November 14, 2023: Fourth regulatory hold point lifted for Darlington Nuclear Generating Station Unit 1
- October 10, 2024: Third regulatory hold point lifted for Darlington Nuclear Generating Station Unit 1
- September 12, 2024: Second regulatory hold point lifted for Darlington Nuclear Generating Station Unit 1
- April 29, 2024: First Regulatory hold point Lifted for Darington Nuclear Generating Station Unit 1
- July 8, 2023: Fourth regulatory hold point lifted for Darlington Nuclear Generating Station Unit 3
Regulatory actions
The CNSC posts regulatory enforcement actions taken to protect the health, safety and security of Canadians and the environment. Use the links below to find out more about any orders or penalties that have been placed on this licensee, if any.
- June 13, 2024: Letter to OPG
- May 31, 2023: Administrative monetary penalty issued
Disclosure
Licensees must report events and incidents involving licensed activities that could impact the health, safety and security of Canadians and the environment to the CNSC. Use the links below to find any information provided by this licensee, if any, as well as other public disclosures made by licensees.
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Event reports
(source: Ontario Power Generation) -
Disclosure protocol
(source: Ontario Power Generation)
Engagement
- September 16-18, 2022: CNSC participated in Community Outreach at the Port Hope Fair
- September 23-24, 2022: CNSC participated in OPG Community Open House at the Darlington Energy Complex.
- October 12, 2022: CNSC participated in engagement meetings with Hiawatha First Nation Leadership
- October 13, 2022: CNSC participated in engagement meetings with Mississaugas of Scugog Island First Nation Leadership
- October 14, 2022: CNSC participated in engagement meetings with Curve Lake First Nation Leadership
Related links
- How regulatory hold points contribute to the safe and successful restart of a newly refurbished reactor
- Video: What is Radioactive Waste?
- Pressure tubes: The heart of the matter
- July 13, 2021: Darlington and Pickering NGS: Request pursuant to Subsection 12(2) of the General Nuclear Safety and Control Regulations: Issues Relating to Measurement of Hydrogen Concentration in Pressure Tubes
Protecting Canadians and the environment
Environment
The CNSC uses information provided by licensees to create our own reports assessing the environmental effects of nuclear facilities or licensed activities.
- Environmental monitoring: Independent environmental monitoring results collected by the CNSC
- Environmental risk assessment: Email cnsc.info.ccsn@cnsc-ccsn.gc.ca to request a copy
- Federal, provincial and municipal monitoring programs: List of monitoring programs managed by other levels of government
- Radionuclide releases: Nuclear Power Plants dataset in the Open Government catalogue for information on releases from this facility
Health and safety
The CNSC oversees licensee emergency planning and works with other levels of government to ensure the health and safety of Canadians. We also conduct and review health studies on various areas associated with the production, possession or use of nuclear substances.
- Emergency Management Ontario
- OPG nuclear safety and emergency preparedness
- CNSC health studies on Canadian nuclear facilities: Relevant health studies of nuclear reactors regulated by the CNSC
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