New Nuclear Power Plants

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Supreme Court issues decision on Darlington site preparation licence

On April 28, the Supreme Court of Canada issued its decision to not hear the appeal filed by Greenpeace Canada, Lake Ontario Waterkeeper, Northwatch and the Canadian Environmental Law Association with respect to the environmental assessment and the site preparation licence for the proposed new nuclear power reactors at the existing Darlington Nuclear Generating Station.

The decision to not hear the appeal means that the Federal Court of Appeal’s decision on the legality of the environmental assessment and the licence stands. That is, the Federal Court of Appeal found that the Joint Review Panel’s environmental assessment was fully compliant with the Canadian Environmental Assessment Act.

The final result in this case is a validation of the Canadian Nuclear Safety Commission’s competence as an expert nuclear regulator that conducts proper and legal environmental assessments, and ensures the safety of the public and the environment.


The CNSC is appealing to the Federal Court of Appeal the Federal Court's May 14, 2014 judgment regarding the Darlington New Nuclear Power Plant Project proposed by Ontario Power Generation (OPG). In the view of the CNSC, there are aspects of the May 14, 2014 Federal Court decision that contain errors of law with respect to Court's interpretation of the Canadian Environmental Assessment Act and the manner in which it reviewed the assessment done by the Joint Review Panel in this case.

Read the Notice of Appeal (PDF)

Press release: August 17, 2012: CNSC Issues a Site Preparation Licence for Ontario Power Generation (OPG) Darlington Nuclear Power Plant Project

For information about the project milestones

General licensing information for new nuclear power plants in Canada

For information on the CNSC's approach to licensing, guidance on site evaluation, Joint Review Panel and an overview of licensing timelines and process steps, please see:

CNSC Work Instructions

The CNSC is currently developing a suite of Work Instructions to support the regulatory assessment of Environmental Impact Statements, and licence applications for new nuclear facilities.

Work Instructions are now available to assist CNSC staff with their assessments of Environmental Impact Statements and of applications for a Licence to Prepare Site for new nuclear power plants.

Preliminary Safety Analysis Report (PSAR) information requirements for a Licence to Construct

When applying for a licence to construct, a Preliminary Safety Analysis Report (PSAR) is required under Section 5(f) of the Class I Nuclear Facilities Regulations.

The PSAR must include:

  • the deterministic safety analysis
  • a probabilistic safety assessment
  • a hazards analysis

Please note that before CNSC staff begins assessing the PSAR, design information, as specified in sections 5(a), 5(b), 5(d), 5(e) and 5(g) of the Class I Nuclear Facilities Regulations, must also be submitted.

Pre-Licensing Vendor Design Reviews

The Canadian Nuclear Safety Commission (CNSC) is undertaking pre-licensing vendor design reviews

Need more information?

If you need a document or more information about currently operating nuclear power plants in Canada, contact the CNSC.

  • Fax: 613-995-5086
  • Mailing address: Canadian Nuclear Safety Commission, 280 Slater Street, P.O. Box 1046, Station B, Ottawa, ON, K1P 5S9

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