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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.

Darlington New Nuclear Project Facility Site

Photo credit: Ontario Power Generation

Location: Bowmanville, Municipality of Clarington, Ontario
Licensee: Ontario Power Generation (OPG)
Reactor type: BWRX-300
Owner: Ontario Power Generation
Number of units: Applied for 1 unit, with possibility of a future application for 3 additional units
Installed capacity: 0
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
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

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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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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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