Bruce Power returns Unit 4 to service following Life Extension outage

Bruce Power’s Unit 4 nuclear reactor has been returned to service following a 119-day planned life extension outage representing another step forward in Canada’s largest private-sector infrastructure project.

The clean electricity generated from this unit contributes to 60 per cent of Ontario’s electricity supply from nuclear, with Bruce Power providing half of this at 30 per cent less than the average cost to generate residential power.

“Thanks to the strong performance of our teams, these life extension activities were safely executed with fewer resources in addition to a range of additional health and safety prevention tools as a result of COVID-19,” said Gord Kozak, Vice-President, Bruce A. “The approximately $130-million investment for Unit 4 during the outage will help the unit perform reliably ahead of its Major Component Replacement, scheduled for 2025 to continue providing Ontario with key reliability and low-cost power.”

Unit 4, which was restarted in 2004, is part of the company’s Life-Extension Program and Major Component Replacement (MCR) Project, which will add about 30 years of life to the reactors. MCR has begun with Unit 6 and will be followed by Unit 3, scheduled to begin in 2023.

“I am incredibly proud of the entire Bruce Power team,” said Kozak. “Our performance in delivering the outage safely and on schedule during the pandemic speaks to the commitment and professionalism of everyone involved in this outage.”

Bruce Power has made investments in all eight units on site to offer additional flexibility to Ontario’s electricity market. Of the 6,400 megawatts (MW) of capacity from its site, there are 2,400 MW of flexible capability which has been utilized many times. The company achieved this flexibility through enhancements on the non-nuclear side of the plant.

About Bruce Power
Formed in 2001, Bruce Power is an electricity company based in Bruce County, Ontario. We are powered by our people. Our 4,200 employees are the foundation of our accomplishments and are proud of the role they play in safely delivering clean, reliable, low-cost nuclear power to families and businesses across the province. Bruce Power has worked hard to build strong roots in Ontario and is committed to protecting the environment and supporting the communities in which we live. Learn more at and follow us on Facebook, Twitter, LinkedIn, Instagram and YouTube.


We stand in solidarity with Black, Indigenous and People of Colour communities across the world in the unquestionable proclamation that their lives matter.

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