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Improving Accessibility of Operating Reserve


Operating Reserve (OR) is stand-by power or demand reduction that the IESO can call on with short notice to deal with an unexpected mismatch between electricity generation and consumption. The IESO schedules OR for every minute of every day to meet requirements set by the North American Electric Reliability Corporation (NERC) and the Northeast Power Coordinating Council (NPCC) to ensure power system reliability.  The IESO has been experiencing an issue with OR where the amount of scheduled OR is not fully accessible. This issue could create challenges for the IESO to recover the supply-demand balance after a system event, and result in unfair cost to the market. In order to better understand and develop potential solutions to this issue, the IESO will be initiating an engagement to discuss this with stakeholders.


Additional details on the IESO’s plans to engage stakeholders throughout the process can be found in the engagement plan. All comments and enquiries on 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 Engagement Activity Expected Actions

September 15, 2022

Improving Accessibility of Operating Reserve update


April 19, 2022

Following the March 25th webinar, the IESO is seeking stakeholder feedback on the proposed Market Rule amendments.

May 18, 2022: IESO Response to Stakeholder Feedback

March 25, 2022

An overview of an Operating Reserve issue that the IESO is experiencing and discuss changes to previously proposed solutions and associated modifications to the Market Rules.

Recorded Presentation

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

June 18, 2021

Deadline for stakeholder feedback on the Proposed Dispatch Tool Change, Draft Market Rule Amendments for Dispatch Tool Change, Claw-back of Unwarranted CMSC and OR Settlement Claw-back.

August 24, 2021: IESO response to stakeholder feedback


June 3, 2021

Improving Awareness of System Operating Conditions Engagement - Two New Advisory Notices Now in Effect


May 28, 2021

An update on the status of the proposals to address the issue of inaccessible operating reserve will be provided, including changes proposed since the last webinar in March 2020. The IESO will discuss and seek stakeholder feedback on draft market rules and manuals to implement the proposed solutions as well.

Recorded Presentation

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

August 20, 2020

Improving Accessibility of Operating Reserve Stakeholder Engagement Update


April 30, 2020

Stakeholder feedback due on the detailed design of the OR settlement claw-back mechanism

IESO response to stakeholder feedback


March 30, 2020

Stakeholder webinar

Recorded Presentation


February 10, 2020


January 10, 2020

Stakeholder feedback from participants on the details of the recommended solution presented during Dec 10th webinar


December 10, 2019

Webinar/meeting to address any outstanding stakeholder feedback or concerns and finalize the solution


August 15, 2019

Formal feedback period on solutions proposed by the IESO.

  • Capital Power
  • Gerdau
  • Northland Power
  • Ontario Power Generation

IESO response to feedback received


July 31, 2019

Webinar/meeting to address feedback from stakeholders and to propose potential solutions to address the issue.


April 11 – 25, 2019

Formal feedback period to gather initial feedback from stakeholders on underlying causes of the issue.

Stakeholder Feedback

  • Gerdau
  • Ivaco Rolling Mills
  • Portlands Energy Centre

April 10, 2019

Webinar to kick-off engagement

  • Discuss the issue with stakeholders and solicit initial feedback on the proposed engagement approach.
  • Presentation

 March 28, 2019


 Engagement launched