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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.

Aerial view of the Darlington facility, near the shore of a large body of water.

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
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.

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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.

View all regulatory actions


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.

View all nuclear-related events


  • 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

Protecting Canadians and the environment


The CNSC uses information provided by licensees to create our own reports assessing the environmental effects of nuclear facilities or licensed activities.

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.

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