Ontario Power Generation advances Wesleyville nuclear plant regulatory review

Ontario Power Generation’s Initial Project Description has put the Wesleyville nuclear proposal into its first formal impact assessment step, opening the regulatory track that must be cleared before any construction can start. The filing matters because it moves the Port Hope project from broad planning into the environmental, social and Indigenous review that will test whether the site can support a new build at all.

The federal registry places the New Nuclear at Wesleyville Project in the Municipality of Port Hope, Ontario, within the traditional and treaty Territory of the Williams Treaties First Nations. As proposed, the plant would provide up to 10,000 megawatts of new nuclear generating capacity and operate for 78 years, which puts it among the largest nuclear projects under discussion in Canada.

That first project description is not an approval. It is the document that makes the rest of the process real: it defines the proposal closely enough for the Impact Assessment Agency of Canada to begin formal review, and it gives regulators, local governments and rights-holders a basis for asking the next round of questions. From here, the assessment has to work through local infrastructure, environmental effects, water use, transportation links, community concerns and how the plant would fit into the region’s long-term power system.

Wesleyville carries some advantages that a greenfield site would not. The property was formerly home to an oil-fired generation project and is already zoned for electricity generation, which removes one of the most basic land-use fights before it starts. The site is not free of scrutiny, though: the assessment phase still has to examine the project in detail, and the separate Canadian Nuclear Safety Commission licensing track would still be required before construction could proceed.

The local file is already active. The Municipality of Port Hope has an “Exploring New Nuclear” page and related Wesleyville updates, and council voted unanimously on Feb. 15, 2022, to proceed with a purchase agreement for more than 1,300 acres of Wesleyville land from OPG, with ownership set to transfer on March 31, 2022. The municipality later said the province stopped the sale, a reminder that the site has been politically contested long before the current review.

Indigenous consultation is moving in parallel. The Impact Assessment Agency of Canada has a draft Indigenous Engagement and Partnership Plan dated April 7, 2026, underscoring that the Wesleyville review is not just technical. It is being built around the consultation requirements that now sit at the center of Canadian new-build planning, and that is the stage where nuclear projects either gain momentum or get bogged down.