Category: 🏛 Organizations & Roles
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Transmitters are organizations responsible for operating and maintaining the high-voltage transmission infrastructure that carries electricity across the province.
Transmission networks move electricity from large generating stations to major substations located near population centers and industrial areas. From these substations, electricity is transferred to distribution systems that deliver electricity to customers.
Transmitters play a critical role in ensuring that electricity can move safely and reliably across Ontario’s power grid.
⚡ Transmitters operate the high-voltage highways of the electricity system.
Their infrastructure allows electricity generated in one location to be delivered to consumers across the province.
Transmitter
A transmitter is an organization that owns or operates high-voltage transmission infrastructure used to transport electricity across the power grid.
Transmitters are responsible for maintaining several types of infrastructure within the electricity system.
These include:
This infrastructure allows electricity to travel long distances with minimal losses.
Related topic:
Transmission System
Transmitters support the electricity system by:
Reliable transmission infrastructure ensures that electricity can reach consumers wherever it is needed.
Transmission companies operate within a regulated framework.
In Ontario, the Ontario Energy Board (OEB) regulates transmission utilities and approves the rates they can charge for providing transmission services.
This regulatory oversight helps ensure that transmission infrastructure is operated safely and that costs are reasonable for electricity consumers.
Related topic:
Ontario Energy Board (OEB)
While transmitters own and maintain transmission infrastructure, the Independent Electricity System Operator (IESO) coordinates how electricity flows across the grid.
The IESO monitors the power system and directs generation dispatch to maintain reliability while using the available transmission network.
Related topic:
Independent Electricity System Operator (IESO)
Consider electricity produced at a large generating station in northern Ontario.
Transmitters maintain the infrastructure that makes this long-distance electricity delivery possible.
➡ Next Topic: Local Distribution Companies
This topic explains the organizations responsible for delivering electricity to homes and businesses through local distribution networks.
Last Updated: 2026-03-26