Nuclear facility – Darlington New Nuclear Project
The Darlington New Nuclear Project (DNNP) represents the site preparation, construction, operation, decommissioning and abandonment of up to 4 new nuclear reactors at the existing Darlington site, owned by Ontario Power Generation (OPG). The goal of this project is to generate approximately 4,800 megawatts of electricity for the Ontario grid.
In December 2021, OPG announced its selection of the General Electric Hitachi BWRX-300 reactor for deployment at the DNNP site. The BWRX-300 is a 300 MWe water-cooled, natural circulation small modular reactor. In October 2022, OPG applied for a licence to construct one BWRX-300 reactor. CNSC staff are currently completing a technical assessment of the application, and hearings for the project are expected to begin in 2024.
|Location:||Bowmanville, Municipality of Clarington, Ontario|
|Licensee:||Ontario Power Generation (OPG)|
|Owner:||Ontario Power Generation|
|Number of units:||Applied for 1 unit, with possibility of a future application for 3 additional units|
|Status:||Licence to prepare site granted, valid until 2031
Licence to construct submitted October 31, 2022 (currently under CNSC review)
|Licensing documentation:||Request a copy of OPG’s licence and licence conditions handbook by emailing firstname.lastname@example.org|
|Joint Review Panel decision history:||Joint review panel (JRP): Darlington new nuclear power plant - Canadian Nuclear Safety Commission|
|Project information and reports:||Open Government portal – Darlington New Nuclear Project - Information and Reports|
|Facility website:||Darlington New Nuclear Project|
|Timelines:||Darlington New Nuclear Project timeline|
- March 15, 2023: Executive summary: Combined phases 1 and 2 pre-licensing vendor design review – General Electric Hitachi Nuclear Energy
- October 31, 2022: Ontario Power Generation submits an application to the CNSC for a licence to construct the Darlington New Nuclear Project, along with 3 work packages to support the application
- OPG applies to Canadian Nuclear Safety Commission for Licence to Construct (external link)
- OPG: Application for a Licence to Construct a Reactor Facility (external PDF, 8 MB)
- View updates on the CNSC’s review of the application through the Open Government portal or contact us for more information
- October 24, 2022: Participant funding to review the environmental impact statement and plant parameter envelope for Ontario Power Generation’s Darlington New Nuclear Project
- November 15, 2022: Webinar: Darlington New Nuclear Project – Upcoming Licensing Review
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.
- April 3, 2023: CNSC to conduct a public hearing on applicability of the Darlington New Nuclear Project environmental assessment and plant parameter envelope to selected reactor technology (PDF, 130 KB)
- June 7, 2022: Record of Decision - Ontario Power Generation - Application for Acceptance of the Revised Financial Guarantee Proposed by Ontario Power Generation for its Darlington New Nuclear Project (Decision) (PDF, 201 KB)
- March 28, 2022: CNSC to conduct a hearing in writing on the financial guarantee proposed by Ontario Power Generation for its Darlington New Nuclear Project (PDF, 120 KB)
- November 24, 2021: Record of Decision - Ontario Power Generation - Application to Renew the Power Reactor Site Preparation Licence for the Darlington New Nuclear Project (PDF, 120 KB)
- June 10, 2021: Hear what our expert said at the Commission hearing on the Darlington New Nuclear Project. Video: Environmental assessment decisions have no shelf life
- March 1, 2021 Revised notice of public hearing on the renewal of Ontario Power Generation Inc.’s nuclear power reactor site preparation licence for the Darlington New Nuclear Project (PDF, 257 KB)
- December 2, 2020: Ontario Power Generation (OPG) submits Notice of Intent for Submission of Licence to Construct Application.
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.
- No recent 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.
- No recent disclosures
CNSC public engagement
- September 26, 2023: Open house: Regulatory oversight of nuclear projects in the Municipality of Clarington, Ontario
- June 22, 2023: Webinar: Darlington New Nuclear Project – Upcoming licensing review (video)
- April 4, 2023: CNSC held a virtual workshop on OPG’s Plant Parameter Envelope and Environmental Impact Statement review reports. A “What We Heard” report, summarizing the event, is being developed and will be distributed and posted publicly.
- December 21, 2022: Consultation on 2 reports for the Darlington New Nuclear Project
- February 2, 2022: Webinar: Regulating small modular reactors (video)
- November 15, 2022: Webinar: Darlington New Nuclear Project
OPG licence applications
- October 2022: Application for a Licence to Construct a Reactor Facility (external PDF, 8 MB, in English only)
- June 2020: Application for renewal of site preparation licence (external PDF, 5 MB)
Impact Assessment Agency of Canada: Darlington New Nuclear Power Plant Project (Archived)
Facility website: Scroll down to “Supporting documents and resources”
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.
- Independent Environmental Monitoring Program: Darlington nuclear generating site
- Environmental risk assessment: Email email@example.com to request a copy
- Federal, provincial and municipal monitoring programs: Other monitoring programs and reporting managed by other levels of government
- Radionuclide Release Datasets: 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.
- Health studies - Canadian nuclear facilities: Relevant health studies of nuclear reactors regulated by the CNSC
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