Ontario Power Generation’s (OPG) Pickering Nuclear Generating Station is one of the largest nuclear generating stations in the world, located in the City of Pickering along the shoreline of Lake Ontario. Pickering Nuclear supplies over 12 percent of Ontario’s electricity safely and reliably and has been doing so for decades. Visit the Pickering Nuclear Information Centre to learn more about OPG and nuclear energy. Hours of operation are: Monday to Friday, excluding holidays, 9:00 a.m. to 3:30 p.m.