<P> Newfoundland and Labrador Hydro's installed generating capacity, 7289 megawatts (MW), 80% hydroelectric, is the fourth largest of all utility companies in Canada . </P> <P> The Northwest Territories has an installed hydroelectric generating capacity of 55 MW, supplying electricity to the North Slave and South Slave electricity grids . Each grid operates independently and is not connected to the electrical grid in the rest of Canada . </P> <P> Ontario Power Generation Produces 50% of electricity used in the province, 40% from hydroelectric, and 60% from nuclear - powered facilities . There also thermal plants that burn biomass and natural gas with a generating capacity of 2,458 MW; these plants were not used in 2015 . </P> <P> After a provincial government commitment to phase out all coal generating plants, two units at Nanticoke were shut down in fall 2010 . Another two were shut down in 2011 . The final four were shut down on December 31, 2013 . </P>

Where is most of canada's hydroelectric power generated