Our corporate structure

Toronto Hydro Corporation

Toronto Hydro Corporation is a holding company which wholly owns two subsidiaries: Toronto Hydro-Electric System Limited and Toronto Hydro Energy Services Inc.

The Corporation is responsible for supervising the operations of its subsidiaries and providing them with corporate, management services and strategic direction.

Toronto Hydro-Electric System Limited

Toronto Hydro-Electric System Limited owns and operates the electricity distribution system for the city of Toronto and is responsible for the following services:

• Delivering safe and reliable electrical power to more than 3 million residents and businesses across the city
• Planning, maintaining and aiming to operate our electricity distribution infrastructure efficiently and in an environmentally responsible manner
• Providing consistent, high-quality customer service

Toronto Hydro Energy Services Inc.

Toronto Hydro Energy Services Inc. provides and maintains street and expressway lighting infrastructure throughout the city.

Our role in Ontario's electricity system

The journey of getting power to your home or business involves electricity generation, transmission and distribution. Here's what's involved at each stage of the process:

Electricity generation

Nearly half of Ontario’s electricity is generated by Ontario Power Generation, a provincially-owned organization with generating stations across the province that produce electricity from nuclear, hydro and thermal energy sources.

Electricity transmission

Once electricity is generated, it’s delivered to urban and rural areas through high-voltage distribution lines that act like highways for transmitting electricity. Hydro One — which owns 30,000 kilometres of transmission lines across 98% of Ontario — supplies electricity to Toronto Hydro.

Electricity distribution

Toronto Hydro is responsible for the last step of the journey: distributing electricity to residential, commercial and industrial customers in Toronto.

The following graphic provides a visual representation of our role in Ontario's electricity system:

Note: Figures listed with an asterisk are approximate.

[1] Includes houses, apartments and condominiums.

[2] With monthly peak demand of less than 5,000 kW (averaged over a 12-month period). Includes schools, restaurants and most shopping malls.

[3] With monthly peak demand of 5,000 kW or greater (averaged over a 12-month period). Includes hospitals, universities and large manufacturers.

Note: Figures may not add to 100% due to rounding. Also, figures do not account for the sale and retirement of Clean Energy Credits (CECs).

[1] Includes Lennox, dual fuel (natural gas/bioenergy) and non-contracted emitting generation consistent with the Independent Electricity System Operator (IESO).