Public Information Sessions

To complement its stakeholdering efforts, the IESO regularly holds public information sessions on various aspects of the system and market.

Regulation Services Overview Webinar - April 25, 2017

 The IESO will present an overview on regulation services by webinar on April 25, 2017 from 2 p.m. to 3:30 p.m. The webinar is intended to provide interested market participants and sector stakeholders with background information on how providers of regulation services interact with the IESO market.

Regulation services act to match the total system generation to total system load and help correct variations in power system frequency. The IESO is planning to expand its capability to schedule regulation by increasing the amount of regulation usually scheduled from 2017-2019. More information is available on the Ancillary Services Market webpage.

To register for this webinar, please click here.

Market Operations Spring 2017 Awareness Session - May 3, 2017

Registration is now open for the IESO Market Operations Spring 2017 Awareness session on May 3, 2017. This is the sixth operations awareness session in a series intended to increase transparency of IESO market operations. The session will focus on the development of the Operating Plan.

This meeting will be of particular interest to people that manage, plan and operate facilities in the electricity system; however, participation is open to all interested.

The session will be held at the Hilton Garden Inn, Mississauga/Oakville. Registration will be limited. To register send an email to .  



Interchange Enhancements

A number of public meetings were held regarding proposed changes aimed at improving the efficiency of the interchange scheduling process. See Interchange Enhancements for posted materials and upcoming meetings.

Market Renewal Education Workshops

The IESO is hosting five education workshops to help stakeholders, market participants and the broader sector better understand the design elements of the market renewal project.

The half-day workshops are intended to be informative and educational on how market design components work with a focus on how they are used in other jurisdictions. The content is targeted to build capacity in these areas. They are also intended to be interactive with opportunities for questions and discussion. The first workshop provides a general overview, and the subsequent four will provide more detail and context into the elements.

The workshop schedule is:

Market Design Overview, January 25, 2017, 9am-12pm - Recorded Presentation
Single Schedule, February 8, 2017, 9am-12pm - Recorded Presentation 
Capacity Market, February 15, 2017, 9am-12pm - Recorded Presentation 
Day-Ahead Market, February 22, 2017, 9am-12pm - Recorded Presentation
Real-Time Unit Commitment, February 22, 2017, 1pm-4pm - Recorded Presentation

To register for one or all of these workshops, please register at

Enhanced Outage Management System – March 22, 2017

The IESO will be holding a webinar on Wednesday, March 22 at 10:00 a.m. to provide information on planned enhancements to the Outage Management System to address feedback from market participants. This session is scheduled for two hours. To receive your webinar invitation, please register at:


Grid-LDC Interoperability Framework Webinar– November 25, 2016

The IESO is hosting an information webinar on Friday, November 25 at 1:00 pm to discuss the development of a grid-LDC interoperability framework. The objective of the framework will be to identify opportunities to enhance the reliability and efficiency of Ontario’s electricity grid through the coordination of IESO and LDC-controlled resources. It is anticipated that operations representatives of LDCs will have the greatest interest in this webinar; however, all interested parties are welcome to participate. To register, email

Through a Grid-LDC Coordination partnership with PowerStream, the IESO has identified existing real-time IESO market and system information that may be useful to LDCs in managing their day-to-day operations as well as a number of short and long-term collaboration opportunities for the IESO and LDC’s. The IESO will present these early learnings during the webinar and provide an opportunity for input on the draft framework including identifying any barriers or other opportunities that might not have been contemplated thus far.

Presentation | Draft Grid-LDC Interoperability Framework | Feedback and IESO Response | Grid-LDC Interoperability Update

Proposed changes to Peak Demand Hours and the Adequacy Report Webinar – November 25, 2016

The IESO is planning to make changes to Peak Demand Hours and the Adequacy Report. All interested stakeholders are invited to a webinar on November 25 from 10am-12pm. 

The IESO is proposing to determine which hours to use a peak demand forecast in the pre-dispatch scheduling timeframe on a dynamic basis. This would be reflected in the Adequacy Report. New information regarding IESO’s regulation requirement, and wind and solar forecast publishing logic to be added in the Adequacy Report will also be presented.

If interested in participating in the webinar, please register with IESO Engagement to receive the webinar details. Stakeholders will have an opportunity to ask questions, seek clarification and provide comments on the material.

Presentation | Bruce Power Feedback and IESO Response | Sygration Feedback and IESO Response | Ontario Power Generation Feedback and IESO Response | Updates: Peak Demand Hours and Adequacy Report | Adequacy Report - Clarification of Peak Demand Hours

Spring 2016 Market Operations Awareness Session – May 5, 2016

The IESO held its fifth Market Operations Spring Awareness session on May 5, 2016. The objective of the session was to increase transparency of IESO market operations, with a focus on the IESO's assessment of future system operability needs and review NERC's long-term reliability assessment. 

Agenda | Presentation

Proposed change to curtail wheel-through transactions as a control action Webinar – April 28, 2016

The IESO is proposing changes to Market Manual 7.2: Near-Term Assessments and Reports. The proposed change would add a new condition in section 1.3.4: IESO Control Actions (Nuclear Manoeuvres Forecasted or Occurring) to allow the IESO to curtail wheel-through transactions if a nuclear shutdown is scheduled in future hours concurrent with wheel-through transactions.

Curtailing wheel-through transactions to prevent a nuclear shutdown may be the appropriate market response during this circumstance given:

  • The IESO’s scheduling tool does not account for all of the implications of a nuclear shutdown for future hours – including the fact that a nuclear unit can take up to 72 hours to re-start after a shutdown; and
  • The fact that the next set of economic resources after the nuclear shutdown are likely to have limited flexibility to be dispatched in this timeframe.

The IESO hosted a stakeholder webinar on April 28 at 10:00 am to discuss the proposal in more detail, answer questions and outline next steps.

Presentation | IMDC - Curtailment of Wheel-Through Transactions to Prevent a Nuclear Shutdown: Update and Next Steps| Q&A Document|
May 20, 2016 Update - Wheel Through Curtailments as a Control Action | IESO Response to Feedback