True, about 60%. Note however the Pickering is shutting down 2 reactors in 2022, and the rest in 2024. That represents about 25% of the operational nuclear power in Ontario. The other 2 nuclear stations are planned for closure between 25-40 years in the future.
Good to know. There is a geological fault line extending from the St Lawrence through Southern Ontario, surrounded by 7 nuclear reactors.