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18-Month Outlook Refresh

The 18-Month Outlook provides an assessment of the reliability of Ontario’s power system over the short term. The IESO is seeking feedback from the report’s users on the content, presentation and format of the quarterly publication.

To view current 18-Month Outlook and associated reports, see Planning and Forecasting/18-Month Outlook.

For questions or further information on this refresh, please review the activities below or email IESO Engagement at

Documents referenced on this page, but not posted, can be obtained by contacting 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.

Schedule of Activities

Date Activities

January 31, 2019

  • Reviewing the revised 18 Month Outlook at the 20-Year Planning Outlook meeting - Agenda
  • Enhancing Long Term Planning Processes and Products and Preliminary 2019 Long-Term Demand Forecast

November 22, 2018

  • On October 11, 2018 OPG submitted inquiries to the IESO regarding the September 2018 Issue of the 18-Month Outlook
  • On November 13, 2018 IESO provided responses

December 20, 2017

Survey responses

November 24, 2017

Survey window closes

November 9, 2017

Survey window opens -

  • Completed surveys can also be emailed to by downloading a pdf version here.