Company overview

Learn about what we do and how we operate.

Toronto Hydro owns and operates an electricity distribution system that delivers electricity to approximately 787,000 customers in the city of Toronto. We serve the largest city in Canada and distribute approximately 18 per cent of the electricity consumed in the province of Ontario.

We're committed to delivering excellent customer service, providing a safe and reliable supply of electricity, and delivering long-term value to the City of Toronto.

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 (commonly referred to as Toronto Hydro) owns and operates the electricity distribution system for the city of Toronto. We have approximately 787,000 customers in Toronto and distribute approximately 18 per cent of the electricity consumed in Ontario.

Toronto Hydro is responsible for the following services:

  • Delivering safe and reliable electrical power to approximately 787,000 residential, commercial and industrial customers in the city of Toronto, which has a population base of approximately 3.0 million people
  • 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. is responsible for providing streetlighting and expressway lighting services in the city of Toronto.

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.

Key facts and figures

As at December 31, 2021
Electricity delivered23,373 (GWh)
Overhead wires15,406 (circuit km)
Underground wires13,681 (circuit km)
Primary switches17,160
Distribution transformers61,140
Control centre1
Operations centres4

Note: Figures listed above are approximate.

Ontario's electricity supply mix

Source: Ontario Electricity Board, Ontario's System-Wide Electricity Supply Mix: 2021 Data (PDF, 180 KB)
Power sourcePercentage of supply mix[1]
Nuclear energy55.3%
Water power23.3%
Natural gas [1]8.1%
Solar PV2.5%
Bioenergy [2]0.5%
Non-contracted [3]1.2%

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 and dual fuel (natural gas/bioenergy) consistent with the Independent Electricity System Operator (IESO).

[2] IESO’s embedded generation data set combines biomass and gas.

[3] Non-contracted represents a variety of fuel types that the IESO is unable to categorize due to a lack of information from Local Distribution Companies (LDCs).