Located in Bruce County , Ontario , the 2,300 acre Bruce Nuclear Generation Station site has eight functional reactors with a combined capacity of 6,430 MW . Providing employment to more than 4,000 people , the plant was built modularly over a 17 year period ( 1970 to 1987 ) by Ontario Hydro . Generating approximately 20 % of the province ’ s electricity requirements , the plant is divided into two separate stations : Bruce A and Bruce B . Both stations employ four Canada Deuterium Uranium ( CANDU ) nuclear reactors . Fuelled by uranium , technicians moderate the core using deuterium-oxide , which allows them to safely control the power output of the reactors .

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