Proposed Market Rule Amendments
Listed below are market rule amendments that are currently under consideration by the Technical Panel, or have been approved by the IESO Board but not yet incorporated into a baseline. All materials prepared for and considered by the Technical Panel are available on the Technical Panel webpage.
Starting in June 2019, the IESO has committed to publishing all of the materials that will be provided to the IESO Board in relation to its deliberations on proposed market rule amendments on this page. This practice is intended to provide greater transparency into IESO decision-making as it relates to market rule amendments and was implemented in accordance with IESO Board-approved recommendations informed by the Advisory Group on IESO Governance and Decision-Making.
Amendments that have been incorporated into a baseline are listed in the market rule amendments archive.
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Last Updated |
MR-00483-R00 – 2025 Capacity Auction Enhancements |
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July 15, 2025 |
The Technical Panel formally recommended the following market rule amendment proposals to the IESO Board for its October 24, 2025 meeting. |
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June 10, 2025 |
The Technical Panel requests that stakeholders review the following amendment proposal and provide comments to the Technical Panel by June 24, 2025. |
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Last Updated |
MR-00482-R00: 2024 Capacity Auction Market Rule Corrections |
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September 23, 2024 |
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August 29, 2024 |
Board Decision with Reasons |
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August 20, 2024 |
Materials to be provided to the IESO Board for Discussion |
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July 16, 2024 |
The Technical Panel recommended the following market rule amendment proposal to the IESO Board at its July 16, 2024 meeting. |
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June 11, 2024 |
The Technical Panel requests that stakeholders review the following amendment proposal and provide comments to the Technical Panel by June 27, 2024. |
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Last Updated |
MR-00479-R00: Transmission Rights Market Enhancements and Platform Refresh |
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June 25, 2024 |
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June 2, 2024 |
Board Decision with Reasons |
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May 30, 2024 |
Materials to be provided to the IESO Board for Discussion |
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February 13, 2024 |
The Technical Panel recommended the following market rule amendment proposal to the IESO Board at its February 13, 2024 meeting |
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January 16, 2024 |
The Technical Panel requests that stakeholders review the following amendment proposal and provide comments to the Technical Panel by February 1, 2024 |
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Last Updated |
MR-00478-R00: Corrections to Intertie Flow Limits Amendment |
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October 23, 2023 |
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September 28, 2023 |
Board Decision with Reasons |
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September 21, 2023 |
Materials provided to the IESO Board for discussion. |
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September 12, 2023 |
The Technical Panel recommended the following market rule amendment proposal to the IESO Board at its September 12, 2023 meeting. |
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Last Updated |
MR-00477: 2023 Capacity Auction Enhancements – Stream 2 |
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October 23, 2023 |
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September 28, 2023 |
Board Decision with Reasons |
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September 21, 2023 |
Materials provided to the IESO Board for discussion. |
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September 12, 2023 |
The Technical Panel recommended the following market rule amendment proposal to the IESO Board at its September 12, 2023 meeting |
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July 11, 2023 |
The Technical Panel requests that stakeholders review the following amendment proposal and provide comments to the Technical Panel by July 25, 2023. |
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Last Updated |
MR-00476: 2023 Capacity Auction Enhancements – Stream 1 |
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July 18, 2023 |
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June 26, 2023 |
Board Decision with Reasons |
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June 23, 2023 |
Materials provided to the IESO Board for discussion. |
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June 15, 2023 |
The Technical Panel recommended the following market rule amendment proposal to the IESO Board at it June 13, 2023 meeting. |
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May 18, 2023 |
The Technical Panel requests that stakeholders review the following amendment proposal and provide comments to the Technical Panel by May 30, 2023. |
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Last Updated |
MR-00457-R00 to R03 and MR-00461-R03: Market Renewal Program - Interim Alignment and Third Batch Definitions |
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June 8, 2023 |
Provisional Board Decision with Reasons
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May 31, 2023 |
Materials provided to the IESO Board for discussion
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April 20, 2023 |
The Technical Panel provisionally recommended the following market rule amendment proposals to the IESO Board at its April 18, 2023 meeting. |
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February 23, 2023 |
The Technical Panel requests that stakeholders review the following amendment proposals and provide comments to the Technical Panel by March 3, 2023. |
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Last Updated |
Technical Panel Terms of Reference |
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March 3, 2023 |
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Last Updated |
MR-00471-R00: Updates to Synchrophasor Monitoring Requirements |
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October 20, 2022 |
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July 7, 2022 |
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June 2, 2022 |
Board Decision with Reasons |
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May 31, 2022 |
Materials provided to the IESO Board for discussion. |
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April 21, 2022 |
The Technical Panel recommended the following market rule amendment proposal to the IESO Board at its April 19, 2022 meeting. |
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March 22, 2022 |
The Technical Panel requested that stakeholders review this amendment proposal and provide comments to the Technical Panel by April 7, 2022. Feedback from Ontario Power Generation was received. |
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Last Updated |
MR-00455, MR-00461-R01: Market Renewal Program – Market Power Mitigation, Second Batch Definitions |
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August 25, 2022 |
Board Decision with Reasons |
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August 22, 2022 |
Materials provided to the IESO Board for discussion.
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| Last Updated |
MR-00461-R01: Market Renewal Program – Market Power Mitigation: Batch 2 Definitions |
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March 24, 2022 |
A majority of the Technical Panel provisionally recommended the following market rule amendment proposal to the IESO Board. The Technical Panel requests that stakeholders review this amendment proposal and provide comments to the Technical Panel by March 1, 2022. Note: No changes have been made to the version posted on January 20, 2022. The Technical Panel requests that stakeholders review this amendment proposal and provide comments to the Technical Panel by February 3, 2022. |
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MR-00455: Market Renewal Program – Market Power Mitigation |
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March 24, 2022 |
A majority of the Technical Panel provisionally recommended the following market rule amendment proposal to the IESO Board. |
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February 15, 2022 |
The Technical Panel requested that stakeholders review this amendment proposal and provide comments to the Technical Panel by March 1, 2022. Note: No changes have been made to the version posted on January 20, 2022.
The Technical Panel requested that stakeholders review this amendment proposal and provide comments to the Technical Panel by February 3, 2022. |
| Last Updated |
MR-00450, MR-00451, MR-00453, MR-00461: Market Renewal Program – Batch 1 Market Entry and Prudential Security |
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June 10, 2021 |
Materials provided to the IESO Board for discussion.
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June 16, 2021 |
Provisional Board Decision with Reasons
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| Last Updated |
MR-00461: Market Renewal Program - Batch 1 Definitions |
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April 22, 2021 |
The Technical Panel provisionally recommended the following market amendment proposal to the IESO Board at its April 20, 2021 meeting.
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March 25, 2021 |
The Technical Panel requests that stakeholders review this amendment proposal and provide comments to the Technical Panel by April 6, 2021. Comments received can be found on the Technical Panel webpage.
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| Last Updated |
MR-00453: Market Renewal Program - Prudential Security |
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April 22, 2021 |
The Technical Panel provisionally recommended the following market amendment proposal to the IESO Board at its April 20, 2021 meeting. |
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March 25, 2021 |
The Technical Panel requests that stakeholders review this amendment proposal and provide comments to the Technical Panel by April 6, 2021. Comments received can be found on the Technical Panel webpage.
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| Last Updated |
MR-00451: Market Renewal Program - Facility Registration |
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April 22, 2021 |
The Technical Panel provisionally recommended the following market amendment proposal to the IESO Board at its April 20, 2021 meeting. |
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March 25, 2021 |
The Technical Panel requests that stakeholders review this amendment proposal and provide comments to the Technical Panel by April 6, 2021. Comments received can be found on the Technical Panel webpage.
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| Last Updated |
MR-00450: Market Renewal Program - Participation Authorization |
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April 22, 2021 |
The Technical Panel provisionally recommended the following market amendment proposal to the IESO Board at its April 20, 2021 meeting. |
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March 25, 2021 |
The Technical Panel requests that stakeholders review this amendment proposal and provide comments to the Technical Panel by April 6, 2021. Comments received can be found on the Technical Panel webpage.
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