FortisOntario Inc. is an electric utility which owns and operates Canadian Niagara Power Inc., Cornwall Street Railway Light & Power Company Ltd. and Algoma Power Inc., serving a combined 64,000 customers located in Fort Erie, Port Colborne, Cornwall, Gananoque and the Algoma District of northern Ontario. The Company also owns regulated transmission assets in the Niagara and Cornwall regions, including an international interconnection between New York State and Fort Erie, Ontario. It has approximately 3,300 km of distribution and transmission lines and had a combined peak demand of 272.8 MW in 2010. FortisOntario owns a 10 per cent strategic interest in Westario Power, Rideau St. Lawrence, and Grimsby Power, three regional electric distribution companies serving approximately 38,000 customers. Canadian Niagara Power and Algoma Power purchase their electricity from the Ontario Independent Electricity System Operator, while Cornwall Electric is primarily supplied by Hydro Québec. FortisOntario is the only investor owned electricity distribution utility in the province of Ontario.