Unit 4 at the nuclear plant was shut down for a planned outage. It ran for more than 570 days of continuous operation before the outage.
All the four units of the nuclear station are in operation and are together providing clean and low-cost electricity to the people of Ontario in two decades, according to the company.
Bruce Power president and chief executive officer Duncan Hawthorne said that in 2012, Unit 1 and 2 returned to service and following investment programs in Units 3 and 4 too are producing electricity.
"Electricity from Bruce A is important as Ontario moves forward to complete coal phase-out with affordable Bruce Power nuclear," Hawthorne added.
Bruce Power executive vice president and chief nuclear officer Len Clewett said, "With Unit 4 back, Ontario can now count on all four Bruce A units to meet the province’s energy needs, while keeping costs low for our families and businesses."
Each of the four units at the station has a capacity to produce about 750MW of electricity.
