Bruce Power Unit 1 sets record of 624 consecutive days of reliable operation, delivering clean power to Ontario

On April 30, the Unit 1 nuclear reactor marked 624 consecutive days of steady operation, a Bruce Power-record run of providing clean, reliable, cost-effective energy to the people of Ontario.

“This run of uninterrupted production is the longest since it was returned to service in 2012, and is an excellent example of the benefits to Ontario families and businesses of extending the life of its nuclear fleet,” said Len Clewett, Bruce Power’s Chief Nuclear Officer.

Unit 1 surpasses Unit 8’s run of 623 consecutive days between May 2016 and February 2018. Unit 1 was put into service in 1977, and in 1981 it was the top-ranked reactor in the world with a 97 per cent capacity factor, something it has replicated in its record run over the past two years. Unit 1 was shut down and mothballed by the former Ontario Hydro in 1997, and was refurbished and returned to service in 2012 by Bruce Power.

Bruce Power’s Units 3 and 4 were restarted in 2003 and 2004, and have performed at the highest levels since. Units 3 and 4 are part of Bruce Power’s Life-Extension Program and will undergo their own Major Component Replacement Projects from 2023-28, adding about 30 years of life to the reactors. The refurbishment, or Major Component Replacement, of Bruce Power’s Unit 6 has begun and will be followed by Unit 3 which is scheduled to begin in 2023.

In addition to this strong record of reliability, 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.

Nuclear power accounts for more than 60 per cent of Ontario’s supply, with Bruce Power providing more than 30 per cent of the province’s electricity at 30 per cent less than the average cost to generate residential power.

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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