Annual Planning Outlook

A long-term view of Ontario's electricity system, the IESO’s Annual Planning Outlook (APO) forecasts electricity demand, assesses the reliability of the electricity system, identifies capacity and energy needs, and explores the province’s ability to meet them. In providing comprehensive information and insights about future electricity needs, and other considerations, including system performance, the outlook helps inform the decisions that will lay the foundation for a reliable and affordable electricity future.


2022 Annual Planning Outlook Supply Scenarios: Planning Information Session

June 21, 2022

Provide an overview of the supply outlook scenarios being considered for the 2022 Annual Planning Outlook.

This webinar is being presented during the IESO's June stakeholder engagement sessions, see full agenda for more information.


2021 Annual Planning Outlook

Overview webinar

January 25, 2022

The IESO will present key findings of the 2021 Annual Planning Outlook (APO) and provide stakeholders with an opportunity to ask questions, seek clarification, and provide feedback on areas for improvement of future outlooks. Opening remarks will be provided by Chuck Farmer, Vice President Planning, Conservation and Resource Adequacy.

Recorded Presentation | Presentation | Feedback form

February 18, 2022 Stakeholder Feedback | City of Ottawa | Northland Power | Ontario Power Generation | Power Workers Union

This webinar was presented during the IESO's January stakeholder engagement sessions, see full agenda for more information.

2020 Annual Planning Outlook

2020 Annual Planning Outlook

The IESO presented key findings of the 2020 APO at the January engagement days. A recording of the session is available.

Modules, Methodology and Supplemental Data

Demand Forecast

Resource Adequacy

Transmission Security

Fuel Cost, Avoided Costs, Avoided Emissions

2019 Annual Planning Outlook

Documents referenced on this page, but not posted, can be obtained by contacting customer.relations@ieso.ca with a link to the web page that lists the document and advise whether it needs to be provided in an accessible format. Please allow a minimum of one business day for a response.


2019 Annual Planning Outlook

Modules, Supplemental Data and Methodology

Demand Forecast

  • Demand Forecast Module
  • Demand Forecast Module Data
  • Demand Forecast Methodology
  • Hourly Demand Forecast - Reference Case
  • Hourly Demand Forecast - Energy Efficiency

Resource Adequacy

  • Resource Adequacy Module
  • Resource Adequacy Module Data
  • Ontario Generation Resource Database
  • Resource Adequacy Methodology

Costs, Avoided Costs, Avoided Emissions

  • Fuel Cost Assumptions
  • Marginal Costs
  • Avoided Costs
  • Avoided Emissions