Hydro One Limited, through its subsidiaries, operates as an electricity transmission and distribution company in Ontario. It operates through three segments: Transmission Business, Distribution Business, and Other. The company owns and operates approximately 30,000 circuit kilometers (KMs) of high-voltage transmission lines and 124,000 circuit KMs of primary low-voltage distribution network. It serves approximately 1.4 million residential, small business, commercial, and industrial customers. The company also provides telecommunications support services for its transmission and distribution businesses; and communications and information technology services and solutions. Hydro One Limited was incorporated in 2015 and is headquartered in Toronto, Canada.