Public Information Sessions

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

IESO to introduce new “Self-Bottling” purpose code for wind and solar generators – Outage Management

The purpose of this initiative is to improve the accuracy of variable generation forecasts during any station outages or equipment de-rates by ensuring that the centralized forecast predicts output of the station proportionate to their available capacity but capped at a de-rated maximum.

As this will affect how wind and solar generators submit certain outages in the Outage Management tool, the IESO will be holding two training webinars on April 16 and 19 to discuss the purpose and application of the new “Self-Bottling” outage purpose code and allow one week for market trials.

Implementation of this new purpose code in sandbox is scheduled for April 12 and in production for May 22, 2018.                     

Webinar and testing availability                   

The webinars are scheduled as follows:

  • April 16, 2018– 1:30 to 2:00 p.m.
  • April 19, 2018 – 1:30 to 2:00 p.m.

To register for one of the information sessions, please e-mail            

Feel free to check out this new purpose code in the sandbox environment any time after implementation in sandbox scheduled for April 12. Please note that you will need to be registered in the Equipment Outage Submitter role in sandbox. Feedback on testing the new code in sandbox can be submitted to IESO Customer Relations.


MACD Compliance and Enforcement Guidance (CEG) Process Webinar and Launch – March 6, 2018

On March 7, 2018 the IESO’s Market Assessment and Compliance Division (MACD) will be launching a process to provide, upon request or on its own initiative, compliance and enforcement guidance regarding specific market rules and manuals. This guidance will represent, on a forward looking basis, MACD’s view as to the meaning of that specific provision and its potential application to compliance and other enforcement determinations.

A Public Information Session webinar regarding the CEG Process will be held on Tuesday, March 6, 2018, from 2:00 PM to 3:30 PM Eastern.


Request for Information about Non-emitting Resources - December 21, 2017

The IESO hosted an information webinar to explain more about the Request for Information to be issued in February on the role of the non-emitting resources sector in the future electricity marketplace.

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Access the recorded webinar or view the presentation.

Market Information System Refresh

The engine behind Ontario's electricity market is scheduled to be refreshed with a new IT solution. The Market Information System contains the tools and processes that optimize the dispatch of Ontario's electricity system. The IESO hosted an information webinar on October 6, 2015 to discuss the project objectives, scope and timeline and potential opportunities to test the new solution. Implementation is currently scheduled for December 2017.

Communication: Pre-implementation review as part of Market Information System refresh project completed - December 4, 2017

Communication: Get ready to test the new Dispatch Advisory Reports – Testing period scheduled for November 13 to 24, 2017

Communication: MIS Refresh Project Update - August 24, 2017

Presentation: MIS Refresh Project | Meeting Minutes - October 6, 2015

Communication: MIS Refresh - Request for Feedback – October 8, 2015

Stakeholder Feedback:  Ontario Power Generation, TransCanada Energy Ltd.

IESO Response to Stakeholder Feedback


Expanding Participation in Operating Reserve - November 10, 2017

At a webinar, Expanding Participation in Operating Reserve (OR),  the IESO engaged in a dialogue with stakeholders to review the current OR requirements and registration criteria for providing reserve to the Ontario energy market, as well as a discussed the potential to expand participation in Operating Reserve to resources types that are not currently participating.


IESO Settlement System Replacement Project

The IESO is embarking on a multi-year project that, with direct stakeholder input and involvement, will upgrade the IESO Settlement System. To prepare stakeholders for the work, the IESO held a series of webinars with groups of market participants to discuss the details of the project.  The Settlement System Replacement Project is currently in a visioning phase which will lead to a formal IESO engagement open to all interested stakeholders in mid-2018.  To ensure that stakeholder feedback is included in the entire process, from visioning to implementation of a new system, feedback is encouraged by October 31 and will continue to be requested throughout the engagement process.

If you are interested in providing feedback on this initiative, please direct it to the IESO at

To help inform your feedback by providing background on the initiative, please find below a copy of the presentation used during the Settlement System Replacement Project webinars which also include questions that are intended to inform your feedback.


Market Operations Fall 2017 Awareness Session - November 14, 2017

The IESO held a Market Operations Fall 2017 Awareness session on November 14. This is the seventh operations awareness session in a series intended to increase transparency of IESO market operations. The session focused on innovation in the marketplace.


Agenda | Presentation

Control Action Operating Reserve (CAOR) Phase I - October 13, 2017

The CAOR Phase I is one stream of the Expanding OR Initiatives project that was outlined during the October 3rd public webinar. 

The objective of CAOR Phase I is to review the reallocation of CAOR offer quantities to better represent the capabilities of the two control actions in the 10 and 30 minute OR markets respectively.



Introduction of Operating Reserve Initiatives - October 3, 2017

The IESO is initiating a series of public information sessions pertaining to the Operating Reserve (OR) market with some streams possibly leading to formal IESO Engagements in the future. The OR streams that are being introduced during the October 3rd webinar are as follows:

  1. Enabling System Flexibility (Webinar: October 29 – already an existing Engagement within Market Renewal)
  2. Control Action Operating Reserve, Phase I (Webinar: October 13)
  3. Introduction to Expanding Participation in OR (Webinar: November 10)
  4. CAOR, Phase II (Date in 2018, TBD)

The objective of these various initiatives is to review the expanding participation in OR to additional resource types as well as exploring changes to the Control Action Operating Reserve (CAOR) mechanism. 

Interested stakeholders should contact


CROW Enhancements to the Outage Management System Webcast - August 24, 2017

The CROW Enhancements to the Outage Management System are scheduled to go-live the week of September 11.

In preparation, the IESO offered a one hour training webinar to market participants required to report outages in the tool.

Presentation - Recorded Presentation

Past Information Sessions

Solar Eclipse Information Webinar – August 3, 2017

A solar eclipse passed over parts of the continental U.S. and Canada on August 21, 2017.  Although Ontario only saw a partial eclipse, IESO’s Operations group planned for any potential impacts this might have on the electricity grid. All interested stakeholders were invited to participate in an information webinar to learn how the IESO forecasted the conditions and planned for the potential actions that might be required by the IESO to maintain reliability.


Seasonal Readiness Program Webinar - June 6, 2017

The IESO may exercise the Seasonal Readiness Program in preparation for peak demand seasons or as deemed necessary for reliability. The IESO is looking to expand the program starting in September 2017 to further ensure unit readiness during all periods of the year. A public information session was held by to detail the changes.

More information on the Seasonal Readiness Program is available in section 7.3 of Market Manual 7.1.

Regulation Services Overview Webinar - April 25, 2017

The IESO presented an overview on regulation services 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.

Recorded Presentation - Presentation Slide Deck

Market Operations Spring 2017 Awareness Session - May 3, 2017

The IESO hosted the Market Operations Spring 2017 Awareness session. this was the sixth operations awareness session in a series intended to increase transparency of IESO market operations. The session focused on the development of the Operating Plan.

Agenda | Presentation


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 hosted 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 covered how market design components work with a focus on how they are used in other jurisdictions. The first workshop provides a general overview, and the subsequent four provide more detail and context into the elements.

The workshop schedule:

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 held a webinar to provide information on planned enhancements to the Outage Management System to address feedback from market participants.


Grid-LDC Interoperability Framework Webinar– November 25, 2016

The IESO hosted an information webinar to discuss the development of a grid-LDC interoperability framework. The objective of the framework was to identify opportunities to enhance the reliability and efficiency of Ontario’s electricity grid through the coordination of IESO and LDC-controlled resources.

Through a Grid-LDC Coordination partnership with PowerStream, the IESO 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 presented these early learnings during the webinar and provided an opportunity for input on the draft framework including identifying any barriers or other opportunities that might not have been contemplated.

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 presented the changes to be made to the Peak Demand Hours and the Adequacy Reports and invited feedback.

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