Category: ⚡ Markets & Operations
Complexity Level: ●○○○○ (Level 1–2 – Introductory)
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Dispatch is the process used to determine which generators produce electricity and how much electricity they produce at any given time.
Because electricity demand changes constantly, the electricity system must continuously adjust generation to match demand. Dispatch ensures that enough electricity is produced to keep the power system balanced and operating reliably.
In Ontario, the Independent Electricity System Operator (IESO) is responsible for dispatching generators.
⚡ Dispatch determines which power plants run at any moment.
The system operator selects generators to produce electricity so that supply matches demand while keeping the grid operating safely.
Dispatch
Dispatch is the process of instructing electricity generators to increase or decrease their output in order to balance supply and demand on the power system.
Electricity demand changes throughout the day.
For example:
To keep the system balanced, generator output must be adjusted to follow these changes in demand.
Dispatch ensures that the right amount of electricity is produced at the right time.
The Independent Electricity System Operator (IESO) manages dispatch in Ontario.
Its responsibilities include:
These decisions must also ensure that the transmission system operates safely.
Related topic:
Independent Electricity System Operator (IESO)
Dispatch generally follows a simple sequence:
This process occurs repeatedly throughout the day as electricity demand changes.
Consider a weekday morning when electricity demand begins to rise.
Dispatch helps ensure the electricity system remains balanced and reliable.
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Electricity Pricing
This topic explains how electricity prices are determined in Ontario’s wholesale electricity market.
Last Updated: 2026-03-26