Day-Ahead Market Engagement
Documents referenced on this page, but not posted, can be obtained by contacting engagement@ieso.ca 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.
Update August 21, 2019: The Day-Ahead Market high-level design engagement has completed. Please visit the energy detailed design engagement to learn about current engagement opportunities.
The IESO is working with stakeholders to design and develop a financially-binding Day-Ahead Market. A Day-Ahead Market will provide market participants with price certainty ahead of real-time, increase operational certainty for both market participants and the IESO, and reduce out of market payments.
Soon after the market opened in 2002, the IESO began discussions with stakeholders on the development of a financially-binding day-ahead market. The Day-Ahead Market project did not proceed for a number of reasons but a key challenge was the complexities of settlement and operation under the existing two-schedule system for pricing and dispatch.
The IESO launched a day-ahead commitment process (DACP) in 2006, which commits certain dispatchable generators and the economic scheduling of imports in the day‐ahead time frame, in return for a financial guarantee. A number of further enhancements were made to the day-ahead commitment process in 2011, including improved optimization and allowing committable generators to submit their start-up and operations costs along with their energy offers.
While many improvements have been made to the commitment process, the absence of a day ahead financial commitment for all resources limits the extent to which participants will fully and efficiently participate.
The replacement of the existing Enhanced Day-Ahead Commitment Process with a financially-binding Day-Ahead Market (DAM) can provide significant improvements and benefits:
- dispatchable resources have improved production certainty
- the system operator has improved operational certainty as real-time approaches, and
- consumers benefit from more efficient and cost-effective decisions overall.
The transition to a DAM is enabled significantly by the move to a single schedule electricity market under Market Renewal.
Get involved
This initiative will reenvision how stakeholders participate and are committed in the day-ahead timeframe and will therefore be of interest to all IESO market participants.
Interested parties are invited to participate in, and provide feedback on, any of the Market Renewal initiatives.
For more information about how to become involved or to provide comments on this initiative, please contact engagement@ieso.ca.
Stakeholder Engagement Plan
Day-Ahead Market High-Level Design (final full document August 2019)
Executive Summary (final August 2019)
Revisions to the Energy Stream High-Level Design Documents (August 2019)
Day-Ahead Market High-Level Design (draft full document December 2018)
Executive Summary (draft December 2018)
Issues & Actions Log
DAM Design Tracker
Schedule of Activities
Date |
Activities |
Expected Actions |
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August 8, 2019 |
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February 28, 2019 |
Stakeholder Feedback
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February 7, 2019 |
Q&A Session
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December 20, 2018 |
Release of draft DAM High-Level Design |
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December 15, 2018 |
Stakeholder Feedback
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November 22, 2018 |
Deadline for feedback on SSM HLD
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October 18, 2018 |
Market Renewal Education and Awareness Sessions for targeted audiences |
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October 18, 2018 |
Stakeholder feedback on materials and issues discussed at the September 20th meeting
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September 20, 2018 Agenda Minutes |
Stakeholder Meeting
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August 24, 2018 |
Stakeholder Feedback
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August 16, 2018
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Stakeholder Feedback on materials and issues discussed at the July 18th and 19th meetings
IESO Response to Stakeholder Feedback |
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August 13, 2018
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Stakeholder Feedback on Market Power Mitigation
IESO Response to Stakeholder Feedback |
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August 1, 2018 |
Optimization of Energy Limited Resources |
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July 18-19, 2018 Agenda Minutes |
Stakeholder Meeting
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June 21, 2018 |
Stakeholder feedback on materials and issues discussed at the May 23rd and 24th meetings
IESO Response to Stakeholder Feedback |
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June 7, 2018 |
Webinar Invitation: MRP Energy Workstream - Intertie Transactions - Stakeholder Discussion
Stakeholder Feedback
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May 23-24, 2018 Agenda Minutes |
Stakeholder Meeting
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April 27, 2018 |
Feedback due on materials presented at the March 27 Market Power Mitigation meeting
IESO Response to Stakeholder Feedback |
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April 27, 2018 |
Feedback due on remaining preliminary decisions from the March 27 DAM meeting
IESO Response to Stakeholder Feedback |
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April 13, 2018 |
Feedback due on pre-approved operating restrictions (see slide 27 for details) from the March 27 DAM meeting Stakeholder Feedback
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March 27, 2018 DAM Minutes MPMI Minutes |
Stakeholder Meeting
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February 28, 2018 |
Stakeholder Feedback
IESO Response to Stakeholder Feedback |
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January 31, 2018 Agenda Minutes |
Stakeholder Meeting
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November 27, 2017 Agenda |
Stakeholder Meeting – Design Elements Fundamentals: Market Power Mitigation, Price Formation, Settlements
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Materials posted one week in advance of meeting Recorded Presentation |
November 10, 2017 |
Stakeholder Feedback
IESO Response to Stakeholder Feedback |
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October 30, 2017 Agenda |
Stakeholder Meeting
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Recorded Presentation |
October 11, 2017 Agenda |
Stakeholder Meeting - Introduction to Engagement, High Level Overview of Design Elements and Scope
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Recorded Presentation
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September 28, 2017 |
Announce Engagement and Post Draft Stakeholder Engagement Plan
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