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Proposed IESO Outage Approval Criteria

The IESO is seeking feedback from stakeholders regarding its proposal to use extreme weather conditions to assess planned outages that affect resource adequacy. The proposed changes are expected to increase accuracy in the way the IESO conducts planned outage scheduling which will in turn, improve the resource adequacy and reliability outlook, as well as increased certainty for generators. The proposed criteria is equal to -2,000MW of Reserve Above Requirement (RAR) under extreme weather conditions as is defined in the 18-Month Outlook Methodology document and 18-Month Outlook. 

The following improvements to the IESO’s resource adequacy modelling parameters have already been made to increase accuracy over the planning horizon:

  • Thermal generating unit capability during normal and extreme weather conditions
  • Hydroelectric capability during low water conditions
  • Import availability during extreme weather conditions

All comments and questions regarding this engagement can be directed to

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 Expected Actions

March 22, 2018


  • Communication
  • Presentation - revised April 12, 2018

IESO Response to Stakeholder Questions from Webinar


February 9, 2018

IESO Response to Stakeholder Feedback


January 12, 2018

Stakeholder Feedback

  • Brookfield Renewable Energy
  • Ontario Power Generation


December 13, 2017

1:30 – 3:00 p.m.


  • Communication
  • Presentation - Revised

To register for this webinar, email