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Hydro One Networks Inc.

Hydro One Networks Inc., our largest subsidiary, is involved in the planning, construction, operation, and maintenance of our transmission and distribution network.

Our transmission system carries electricity from generating stations to local distribution companies and large industrial customers through our high-voltage network of transformer stations, transmission towers, and wires.

We own 97 per cent of transmission in Ontario with 30,000 circuit kilometres of high-voltage transmission lines. We also own and operate 26 interconnections with neighbouring provinces and states, which allow electricity to flow into and out of Ontario.

Our distribution system delivers electricity at lower voltages to homes, farms, and businesses through our network of hydro poles and power lines. Our network is the largest in the province, with 123,000 circuit kilometres of wires serving 1.4 million customers, mostly in rural areas.

Hydro One Telecom Inc.​

Hydro One Telecom provides broadband telecommunications connectivity and managed services solutions for enterprise customers. For more information, visit

Hydro One Remote Communities Inc.

Operates and maintains the generation and distribution assets used to supply electricity to 22 communities across northern Ontario that are not connected to the province’s electricity grid. Learn more about our Remote Communities

Hydro One Sault Ste. Marie  

Hydro One Sault Ste. Marie is an integral component of Ontario's transmission system that connects northern Ontario to southern Ontario consisting of 15 transmission stations, 560 kilometres of high and medium voltage 44-230 kV transmission lines, and related infrastructure covering an area of 12,000 square kilometres and connects to Hydro One’s Wawa and Mississagi transmission stations. ​Learn more about Hydro One Sault Ste. Marie.