Category: 🧱 Foundations
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The transmission system is the network of high-voltage power lines and substations that transports electricity from power plants to major population centers.
Electricity is often generated far from where it is consumed. The transmission system allows electricity to travel long distances efficiently across the province before being delivered to local distribution networks.
In Ontario, the transmission system connects:
This network forms the backbone of the electricity grid.
⚡ Transmission lines move large amounts of electricity over long distances.
High voltages allow electricity to travel efficiently across the grid while minimizing energy losses.
Transmission System
The transmission system is the network of high-voltage lines, towers, and substations that transport electricity from generating stations to regional distribution systems.
Electricity transmission uses very high voltages because it reduces energy losses during transport.
When electricity travels long distances:
Typical transmission voltages in Ontario include:
These high-voltage lines carry electricity across the province.
The transmission system includes several types of infrastructure.
Transmission lines are high-voltage conductors supported by towers or poles.
They connect:
Transmission corridors may span hundreds of kilometers.
Transmission towers support high-voltage conductors and maintain safe distances from the ground and surrounding structures.
These towers are often visible along major transmission corridors.
Substations connect different parts of the transmission network.
They perform several functions:
The transmission system plays a critical role in enabling electricity to move across the province.
It allows electricity generated in one region to supply demand in another region.
For example:
Consider electricity produced at a hydroelectric station in northern Ontario.
➡ Next Topic:
Distribution System
This topic explains how local distribution networks deliver electricity from transmission substations to homes, businesses, and industries.
Last Updated: 2026-03-26