Category: 🧱 Foundations
Complexity Level: ●●●○○ (Level 3 – Intermediate)
Learning Level
You are currently viewing the Advanced version of this topic.
Switch levels:
Basic: /basic/foundations/generation-types
Advanced:/advanced/foundations/generation-types
← Previous: Supply and Demand
→ Next Topic: Transmission System
Electricity generation technologies differ significantly in how they operate, how quickly they can respond to system needs, and how they participate in electricity markets.
These differences influence:
Understanding the characteristics of different generation technologies is essential for understanding system operations and electricity market behavior.
Generation Resource
A generation resource is a facility that converts energy from a primary source—such as nuclear fuel, flowing water, natural gas, wind, or sunlight—into electricity supplied to the power grid.
⚡ Generation technologies are defined not just by their fuel source, but by their operational characteristics.
These characteristics determine how each type of generator contributes to system reliability and how it participates in electricity markets.
Generation resources are often categorized based on how they operate within the electricity system.
Baseload generation provides large, continuous electricity output that operates for long periods.
Characteristics:
In Ontario, nuclear generation is a major baseload resource.
Flexible generation resources can adjust output quickly to respond to changes in demand or fluctuations in renewable generation.
Characteristics:
Natural gas plants and some hydroelectric facilities provide flexible generation.
Another important distinction is whether generation output can be controlled.
Dispatchable generators can adjust their output in response to system operator instructions.
Examples include:
These resources help system operators maintain supply-demand balance.
Variable generation depends on environmental conditions and cannot always be controlled directly.
Examples include:
Their output depends on wind speeds and sunlight availability.
System operators must manage variability using forecasting and flexible generation resources.
Generation resources also differ in how often they operate relative to their maximum capability.
Capacity Factor
The capacity factor of a generator is the ratio of its actual electricity production over a period of time compared to the maximum electricity it could produce if operating continuously at full capacity.
For example:
Capacity factor is an important metric used in generation planning and system reliability analysis.
Different generation types contribute to system reliability in different ways.
For example:
A diversified generation mix helps ensure that the electricity system remains reliable under varying conditions.
Generation characteristics influence how resources participate in electricity markets.
Generators typically submit offers indicating:
The system operator then dispatches resources based on market rules while maintaining system reliability.
Flexible generators often play a key role in responding to market price signals and system conditions.
Related topic:
Electricity Market Overview
Consider a day when wind generation is producing large amounts of electricity.
This coordination allows the electricity system to integrate different generation technologies while maintaining reliability.
➡ Next Topic:
Transmission System
This topic explains how high-voltage transmission infrastructure transports electricity across the province and how transmission constraints influence system operations.
Last Updated: 2026-03-26