Reviewed on Jan 5st, 2018
Independent Electricity System Operator (IESO)
The Independent Electricity System Operator (IESO) is responsible for the day-to-day operation of Ontario's electrical system - one of the most diversified, reliable and efficient in the world. Our foremost responsibility is the safe andreliable operation of the Ontario bulk electricity system. In addition, we are responsible for enabling,administering and operating the competitive wholesale energy markets for the province.