To complement its stakeholdering efforts, the IESO regularly holds public information sessions on various aspects of the system and market.
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, 9am-12pm
Single Schedule workshop, February 8, 9am-12pm
Capacity Market, February 15, 9am-12pm
Day-Ahead Market, February 22, 9am-12pm
Real-Time Unit Commitment, February 22, 1pm-4pm
To register for one or all of these workshops, please register at firstname.lastname@example.org.
Webinar – Interchange Enhancements (e-Tag submissions) – January 24, 2017
A follow-up webinar on the Interchange Enhancements project will be hosted on Tuesday, January 24. The Interchange Enhancements project is aimed to improve the operation and management of interchange scheduling related tasks by enhancing existing interchange scheduling systems and processes.
Feedback will be posted on
this page in the Interchange Enhancements section prior to the January 24 webinar. The IESO thanks all of those who participated in the first meeting.
For anyone interested in this project, please register with the IESO at
email@example.com to receive the webinar details, presentation in advance of the webinar and email updates on the project.
Webinar – Interchange Enhancements – November 29, 2016
The IESO is planning to make changes with respect to the submission of e-Tags and the management of those transactions specifically within the mandatory window. All interested stakeholders are invited to a webinar on Tuesday, November 29 from 1:00pm-2:30pm to discuss these changes.
The Interchange Enhancements project is aimed to improve the operation and management of interchange scheduling related tasks by enhancing existing interchange scheduling systems and processes. To support this objective, the project aims to limit manual intervention and error margins and reduce time spent on the phone for both market participants and the IESO’s control room operators. One of the main benefits the IESO is pursuing will be to enable market participants to manage e-Tag ID changes electronically, without the need for IESO operations approval within the existing mandatory window.
For more information on the project and its potential impact on the manner in which your organization manages e-Tags, please register with
IESO Engagement to receive the webinar log-in details. Stakeholders will have an opportunity to ask questions, seek clarification and provide comments on the material presented.
Presentation | Feedback and IESO Response to Stakeholder Feedback
Webinar – Grid-LDC Interoperability Framework – 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
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.
Draft Grid-LDC Interoperability Framework | Feedback and IESO Response |
Grid-LDC Interoperability Update
Webinar – Proposed changes to Peak Demand Hours and the Adequacy Report – 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.
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
Webinar – Proposed change to curtail wheel-through transactions as a control action – April 28, 2016
The IESO is proposing changes to
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.
IMDC - Curtailment of Wheel-Through Transactions to Prevent a Nuclear Shutdown: Update and Next Steps |
May 20, 2016 Update -
Wheel Through Curtailments as a Control Action |
IESO Response to Feedback
Markets Operations Awareness Sessions
Spring 2016 Market Operations Awareness Session – May 5, 2016
Registration is now open for the IESO Market Operations Spring 2016 Awareness session on May 5. This is the fifth operations awareness session in a series intended to increase transparency of IESO market operations. The theme of this session is operability. The session will focus on the IESO's assessment of future system operability needs and review NERC's long-term reliability assessment.
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. To register please email
Fall 2015 Market Operations Awareness Session – December 2, 2015
The IESO Market Operations Fall 2015 Awareness session was held on December 2. It is the fourth operations awareness session in a series intended to increase transparency of IESO market operations. The theme of this session is variable generation. The session provided information on how the IESO coordinates with market participants to enhance reliability, from connection, performance validation, visibility and forecasts.
This meeting will be of particular interest to people that manage, plan and operate facilities in the electricity system; however, participation was open to all interested.
2015 Summer Outlook – June 3, 2015
The IESO provided an operational overview of the most recent winter period and what is expected for summer 2015. There were also presentations on Demand Response progress and information specific to participants in the Industrial Conservation Initiative including a new eligibility requirement.
Overview | Demand Response |
Industrial Conservation Initiative
Spring 2015 Market Operations Awareness Session – May 5, 2015
The IESO discussed its coordination efforts with market participants and neighbouring jurisdictions to enhance reliability − from long term planning to real-time operations.
Winter Update and Summer Outlook|
Quebec Emergency |
NERC Long-Term Reliability Assessment |
NERC Reliability Assurance Initiative |
NERC Essential Reliability Services Task Force |
Enhancing Relationships with LDCs
2015 Winter Outlook - December 10 and 15, 2014
The IESO provided a 2014 operational overview and what is expected for winter 2015. There were also presentations on Demand Response progress and information specific to participants in the Industrial Conservation Initiative. For more information on the Industrial Conservation Initiative, see
Global Adjustment Class A. For more information on the IESO's Demand Response activities, see
Demand Response in Ontario.
Demand Response |
Industrial Conservation Initiative
Gas-Electric Coordination – November 5, 2014
At this session, the IESO provided information on gas-electric coordination, the 2015 Spring outage plan, a review of summer 2014 operations and a preview of 2014-15 winter operations.
Spring 2015 Outage Planning |
IESO Gas-Electric Coordination |
IESO External Gas-Electric Activities
Spring 2014 – April 9, 2014
This meeting featured presentations on the management of surplus baseload generation, the 18-Month Outlook methodology and a preview of 2014 summer operations.
Agenda | Presentations:
18-Month Outlook Reliability Assessment Methodology |
2014 Summer Operations |Surplus Baseload Generation |
System Operations – Managing Minimum Generation Cond
Market Information System Refresh
October 6, 2015
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 to discuss the project objectives, scope and timeline and potential opportunities to test the new solution. Implementation is currently scheduled for November 2017.
MIS Refresh Project |
MIS Refresh - Request for Feedback
Ontario Power Generation,
TransCanada Energy Ltd.
IESO Response to Stakeholder Feedback
Capacity Auction Information Sessions
August 13, 2014
Participants in this session discussed the benefits that a capacity market might bring to Ontario and the elements that will contribute to developing a made-in-Ontario design.
Agenda |Presentations: Value of a Capacity Market in Ontario |
Developing a Made-In-Ontario Capacity Market |
April 8, 2014
As the IESO moves forward to determine the benefits of a capacity market to help address the province's mid-term energy needs, this meeting provided attendees an overview of basic principles, including a discussion from participants in other jurisdictions about their experiences in capacity markets.
Welcoming Remarks by Ted Leonard |
Capacity Market Primer (NERA Economic Consulting) |
Capacity Market Information Session (ISO New England) |
Demand Response Information Sessions
The IESO held three public sessions for stakeholders to provide feedback and hear progress on Demand Response Initiatives. The 2014 sessions, held in April, July and September focused on the transition of the DR3 programs into market-based Capacity-Based Demand Response, the proposed plan for a DR Auction in Ontario and scoping out potential pilot programs. All materials from the DR information sessions are found at: