Hydro One Limited, through its subsidiaries, operates as an electricity transmission and distribution company in Ontario. The company operates through three segments: Transmission, Distribution, and Other. It owns and operates high-voltage transmission lines and primary low-voltage distribution network. The company serves residential, small business, commercial, and industrial customers, as well as municipal utilities. It also provides telecommunications support services for its transmission and distribution businesses; and information and communications technology services and solutions. The company was incorporated in 2015 and is headquartered in Toronto, Canada.