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Public hearing information – Darlington New Nuclear Project

The Canadian Nuclear Safety Commission (CNSC) will hold a public hearing to consider the applicability of the DNNP environmental assessment (EA) to OPG’s selected BWRX-300 small modular reactor technology.

The scope of this hearing does not include consideration of a licensing decision for a licence to construct under the Nuclear Safety and Control Act.

Join the public hearing

The hearing will be held virtually and in the community of Ajax. Members of the public are welcome to attend the public Commission hearing. Registration is not required.

Please note: The opportunity to actively participate in the hearing by submitting an intervention or giving an oral presentation is now closed.

Dates Locations Agenda
Tuesday, January 23, 2024
Wednesday, January 24 2024
Thursday, January 25, 2024
Ajax Convention Centre
550 Beck Crescent
Ajax, Ontario


Read the agenda (PDF, 309 KB) to learn more about the start time(s) and the presentations.

Commission-related documents

The following documents are related to the application, activity and decision making of the Commission for the OPG’s Darlington New Nuclear Project:

Application for a licence to construct a reactor facility 
(external PDF, 8 MB, in English only)
A application for a licence to construct is submitted by the licensee and reviewed by the CNSC. If the application is accepted, it becomes the reference safety case for the plant.
Notice of public hearing and participant funding
(PDF, 130 KB)
The notice includes information related to the purpose and the scope of the hearing, participant funding and interventions.
Agenda for the Commission hearing (PDF, 309 KB) The agenda includes details regarding the date, time, location, oral presentations, and written submissions.
Commission member document (CMD): 24-H2
(PDF, 1 MB)
This document is prepared by CNSC staff and submitted to Commission members prior to the public hearing. It includes a site description, matters for consideration, public consultation and engagement details, and overall conclusions and recommendations.
Download a particular CMD for the January 2024 public hearing
(January 2024 public hearing - OPG Darlington New Nuclear Project)
A list of documents submitted by intervenors is included in the Commission member document (CMD) package. These interventions are considered by the Commission as part of its decision process.
Minutes and video of the Commission hearing
(not available at this time)
The minutes and a recording of the public hearing webcast will be published on the CNSC’s website following the hearing.
Record of decision
(not available at this time)
After the Commission members have deliberated, the record of decision will be published in a document that outlines the Commission’s decision, issues, findings and conditions.

Learn about OPG’s Darlington New Nuclear Project

The Darlington New Nuclear Project (DNNP) proposed by Ontario Power Generation (OPG) is located on the site of the Darlington Nuclear Generating Station in the Municipality of Clarington, Ontario.

OPG is considering the construction and operation of up to 4 new small modular reactors at the existing Darlington site; however, the current application for a licence to construct is for 1 new nuclear reactor.

OPG currently holds a power reactor site preparation licence for the DNNP. The licence was renewed by Commission in 2021.

Proposed nuclear facility

Review the proposed facility details, public engagement updates, licence applications, documents and the protocol.

Project timeline

Learn more about the project milestones and status.

Reports and presentations

Review the various report and presentations prepared by CNSC staff, available on the Open Government portal.


Watch a recording of a webinar hosted by CNSC staff to learn more about the licensing review.

What is a small modular reactor?

It is a new class of nuclear reactors that are considerably smaller in size than traditional reactors, and that may potentially supply power (usually less than 300 megawatt electric) to smaller electrical grids or to remote, off-grid areas.

Watch this short video to learn more.

Learn about small modular reactors (SMRs)

What are SMRs and how small are they? Watch these videos to learn more.

Meet some of the CNSC specialists involved in the regulatory review process for potential SMRs. Watch these videos to learn more.

Interest in SMRs is growing across Canada. Learn about other proposed projects.

Regulation of small modular reactors (SMRs)

All nuclear reactor facilities, SMRs, are Class IA nuclear facilities under the Class I Nuclear Facilities Regulations. In regulating SMRs and new technologies, the CNSC can apply the same criteria used to regulate traditional reactor facilities. This will be done through a risk-informed approach, by applying regulatory oversight that is in line with the risk associated with the regulated activity.

As the CNSC continues to prepare to regulate new nuclear reactors and SMRs, it is committed to keeping Canadians informed and to sharing information on new nuclear activities in Canada.

Indigenous consultation and engagement

The CNSC is working to transform how it works with Indigenous people by supporting their participation in regulatory activities, and consulting and building relationships with Indigenous Nations and communities.

The CNSC acknowledges that the Darlington New Nuclear Project is in the lands and waters of the Michi Saagiig Anishinaabeg and is covered by the Williams Treaties (1923).

Learn more about Indigenous consultation and engagement and funding programs.

Glossary of common terms

On this page , common terms and abbreviations often associated with the Darlington New Nuclear Project and regulatory review are explained.

Questions or comments

For further information on the public Commission hearing process or to request documents, contact the Commission Registry by email at or by telephone at 613-858-7651 or 1-800-668-5284 (toll-free in Canada and the U.S.).

If you have a general inquiry or question about the CNSC’s involvement in the Darlington New Nuclear Project, email or call 613-947-7516 or 1-800-668-5284 (toll-free in Canada and the U.S.).

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