BWRX-300 SMR rendering.
The CNSC concluded that OPG is well-equipped to build the reactor while prioritizing the safety of people and the environment. The commission stated: “OPG is qualified to construct the reactor and will do so in a way that protects the health and safety of people and the environment.” The license, valid until March 31, 2035, incorporates four facility-specific conditions, in addition to standard regulations, to ensure robust oversight of all project activities.
The DNNP, proposed by OPG, involves the development of up to four small modular reactors (SMRs) at the existing Darlington Nuclear site. Situated on the eastern section of the site, the project is designed to generate up to 4,800 megawatts of electricity for Ontario’s grid. Classified as a Class IA nuclear facility under the Class I Nuclear Facilities Regulations, the DNNP builds on OPG’s existing CNSC license for site preparation.
In December 2021, OPG selected the BWRX-300 reactor for the DNNP. The company applied for a construction license in October 2022, and in April 2024, the CNSC confirmed that the project’s Environmental Assessment remained suitable for the chosen reactor technology. OPG anticipates completing the first reactor by 2028, with additional units expected to come online between 2034 and 2036. Lessons learned from the initial reactor’s construction will help reduce costs for the remaining units.
The CNSC underscored its dedication to consulting with Indigenous Nations and groups, stating: “It had fulfilled its constitutional responsibility to consult and, where appropriate, accommodate Indigenous rights in respect of its decision on this matter.” Engagement with Indigenous communities will remain ongoing across all project phases, from construction to decommissioning.
The DNNP supports Ontario’s long-term plan to address rising electricity demands in the 2030s and 2040s. Nuclear power currently supplies about half of the province’s electricity, and initiatives like the DNNP aim to enhance energy reliability while meeting environmental and safety standards. The project reflects a balanced approach to addressing energy needs, community interests, and sustainable development.
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