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.

Last Updated	MR-00483-R00 – 2025 Capacity Auction Enhancements
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. Proposed Market Rule Amendment MR-00483-R00

Last Updated

MR-00483-R00 – 2025 Capacity Auction Enhancements

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.

Proposed Market Rule Amendment MR-00483-R00

Last Updated	MR-00481-R00-R13: Market Renewal Program - Final Alignment
October 18, 2024	Board Decision with Reasons Market Rule Amendment MR-00481-R00 Market Rule Amendment MR-00481-R01 Market Rule Amendment MR-00481-R02 Market Rule Amendment MR-00481-R03 Market Rule Amendment MR-00481-R04 Market Rule Amendment MR-00481-R05 Market Rule Amendment MR-00481-R06 Market Rule Amendment MR-00481-R07 Market Rule Amendment MR-00481-R08 Market Rule Amendment MR-00481-R09 Market Rule Amendment MR-00481-R10 Market Rule Amendment MR-00481-R11 Market Rule Amendment MR-00481-R12 Market Rule Amendment MR-00481-R13 Reasons of the IESO Board in respect of an amendment to the market rules Resolution of the IESO Board of Directors
October 11, 2024	Materials provided to the IESO Board for discussion: Memorandum from Technical Panel Chair Presentation Summary of Market Rule Amendment Batches Market Rule Amendment MR-00481-R00 Market Rule Amendment MR-00481-R01 Market Rule Amendment MR-00481-R02 Market Rule Amendment MR-00481-R03 Market Rule Amendment MR-00481-R04 Market Rule Amendment MR-00481-R05 Market Rule Amendment MR-00481-R06 Market Rule Amendment MR-00481-R07 Market Rule Amendment MR-00481-R08 Market Rule Amendment MR-00481-R09 Market Rule Amendment MR-00481-R10 Market Rule Amendment MR-00481-R11 Market Rule Amendment MR-00481-R12 Market Rule Amendment MR-00481-R13 Technical Panel Vote and Rationale Summary of Stakeholder and Technical Panel member comments Consumer Impact Assessment Draft Resolution
September 12, 2024	The Technical Panel formally recommended the following market rule amendment proposals to the IESO Board for its October 18, 2024 meeting. Proposed Market Rule Amendment MR-00481-R00 Proposed Market Rule Amendment MR-00481-R01 Proposed Market Rule Amendment MR-00481-R02 Proposed Market Rule Amendment MR-00481-R03 Proposed Market Rule Amendment MR-00481-R04 Proposed Market Rule Amendment MR-00481-R05 Proposed Market Rule Amendment MR-00481-R06 Proposed Market Rule Amendment MR-00481-R07 Proposed Market Rule Amendment MR-00481-R08 Proposed Market Rule Amendment MR-00481-R09 Proposed Market Rule Amendment MR-00481-R10 Proposed Market Rule Amendment MR-00481-R11 Proposed Market Rule Amendment MR-00481-R12 Proposed Market Rule Amendment MR-00481-R13
July 17, 2024	The Technical Panel requests that stakeholders review the following amendment proposals and provide comments to the Technical Panel by August 6, 2024. Proposed Market Rule Amendment MR-00481-R00 Proposed Market Rule Amendment MR-00481-R01 Proposed Market Rule Amendment MR-00481-R02 Proposed Market Rule Amendment MR-00481-R03 Proposed Market Rule Amendment MR-00481-R04 Proposed Market Rule Amendment MR-00481-R05 Proposed Market Rule Amendment MR-00481-R06 Proposed Market Rule Amendment MR-00481-R07 Proposed Market Rule Amendment MR-00481-R08 Proposed Market Rule Amendment MR-00481-R09 Proposed Market Rule Amendment MR-00481-R10 Proposed Market Rule Amendment MR-00481-R11 Proposed Market Rule Amendment MR-00481-R12 Proposed Market Rule Amendment MR-00481-R13

Last Updated	MR-00482-R00: 2024 Capacity Auction Market Rule Corrections
September 23, 2024	OEB Letter
August 29, 2024	Board Decision with Reasons Market Rule Amendment Proposal Reasons of the IESO Board in respect of an amendment to the market rules Resolution of the IESO Board of Directors
August 20, 2024	Materials to be provided to the IESO Board for Discussion Memo from Technical Panel Chair Market Rule Amendment Proposal MR-00482-R00 IESO Staff Memo to Technical Panel Technical Panel Vote and Rationale Summary of Stakeholder and Technical Panel Member Comments Consumer Impact Assessment Draft Resolution
July 16, 2024	The Technical Panel recommended the following market rule amendment proposal to the IESO Board at its July 16, 2024 meeting. Proposed Market Rule Amendment MR-00482-R00
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. Proposed Market Rule Amendment MR-00482-R00

Last Updated	MR-00454-R00-R03, MR-00461-R05, MR-00458-R00, MR-00459-R00, MR-00460-R00: Market Renewal Program – Market and System Operations & Calculation Engines
June 13, 2024	Provisional Board Decision With Reasons Market Rule Amendment Proposals – please refer to the May 30, 2024 update below Reasons of the IESO Board in respect of an amendment to the market rules Resolution of the IESO Board of Directors
May 30, 2024	Materials provided to the IESO Board for discussion. Memorandum from Technical Panel Chair Proposed Market Rule Amendment MR-00454-R00 Proposed Market Rule Amendment MR-00454-R01 Proposed Market Rule Amendment MR-00454-R02 Proposed Market Rule Amendment MR-00454-R03 Proposed Market Rule Amendment MR-00461-R05 Proposed Market Rule Amendment MR-00458-R00 Proposed Market Rule Amendment MR-00459-R00 Proposed Market Rule Amendment MR-00460-R00 IESO Staff Memo to Technical Panel Technical Panel vote and rationale Summary of Stakeholder and Technical Panel member comments Consumer Impact Assessment Draft Resolution
May 16, 2024	The Technical Panel provisionally recommended the following market rule amendment proposals to the IESO Board at its June 7, 2024 meeting. Proposed Market Rule Amendment MR-00454-R00 Proposed Market Rule Amendment MR-00454-R01 Proposed Market Rule Amendment MR-00454-R02 Proposed Market Rule Amendment MR-00454-R03 Proposed Market Rule Amendment MR-00461-R05 Proposed Market Rule Amendment MR-00458-R00 Proposed Market Rule Amendment MR-00459-R00 Proposed Market Rule Amendment MR-00460-R00
April 11, 2024	The Technical Panel requests that stakeholders review these amendment proposals and provide comments to the Technical Panel by April 19, 2024. Proposed Market Rule Amendment MR-00454-R00 Proposed Market Rule Amendment MR-00454-R01 Proposed Market Rule Amendment MR-00454-R02 Proposed Market Rule Amendment MR-00454-R03 Proposed Market Rule Amendment MR-00461-R05 Proposed Market Rule Amendment MR-00458-R00 Proposed Market Rule Amendment MR-00459-R00 Proposed Market Rule Amendment MR-00460-R00

Last Updated	MR-00479-R00: Transmission Rights Market Enhancements and Platform Refresh
June 25, 2024	OEB Letter
June 2, 2024	Board Decision with Reasons Market Rule Amendment Proposal Reasons of the IESO Board in respect of an amendment to the market rules Resolution of the IESO Board of Directors
May 30, 2024	Materials to be provided to the IESO Board for Discussion Memo from Technical Panel Chair Market Rule Amendment Proposal MR-00479-R00 IESO Staff Memo to Technical Panel Technical Panel Vote and Rationale Summary of Stakeholder and Technical Panel Member Comments Consumer Impact Assessment Draft Resolution
February 13, 2024	The Technical Panel recommended the following market rule amendment proposal to the IESO Board at its February 13, 2024 meeting Proposed Market Rule Amendment MR-00479-R00
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 Proposed Market Rule Amendment MR-00479-R00

Last Updated	MR-00478-R00: Corrections to Intertie Flow Limits Amendment
October 23, 2023	OEB letter
September 28, 2023	Board Decision with Reasons Market Rule Amendment Proposal Reasons of the IESO Board in respect of an amendment to the market rules Resolution of the IESO Board of Directors
September 21, 2023	Materials provided to the IESO Board for discussion. Memorandum from Technical Panel Chair Market Rule Amendment Proposal IESO Staff Memo to Technical Panel Technical Panel vote and rationale Summary of Stakeholder and Technical Panel member comments Consumer Impact Assessment Draft Resolution
September 12, 2023	The Technical Panel recommended the following market rule amendment proposal to the IESO Board at its September 12, 2023 meeting. Proposed Market Rule Amendment MR-00478-R00

Last Updated	MR-00477: 2023 Capacity Auction Enhancements – Stream 2
October 23, 2023	OEB letter
September 28, 2023	Board Decision with Reasons Market Rule Amendment Proposal Reasons of the IESO Board in respect of an amendment to the market rules Resolution of the IESO Board of Directors
September 21, 2023	Materials provided to the IESO Board for discussion. Memorandum from Technical Panel Chair Market Rule Amendment Proposal IESO Staff Memo to Technical Panel Technical Panel vote and rationale Summary of Stakeholder and Technical Panel member comments Consumer Impact Assessment Draft Resolution
September 12, 2023	The Technical Panel recommended the following market rule amendment proposal to the IESO Board at its September 12, 2023 meeting Proposed Market Rule Amendment MR-00477-R00
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. Proposed Market Rule Amendment MR-00477-R00

Last Updated	MR-00452-R00, MR-00456-R00-R03, MR-00461-R04: Market Renewal Program – Market Settlements, Metering, Market Billing and Funds Administration
August 31, 2023	Provisional Board Decision With Reasons Market Rule Amendment Proposals – please refer to the August 22, 2023 update below Reasons of the IESO Board in respect of an amendment to the market rules Resolution of the IESO Board of Directors
August 22, 2023	Materials provided to the IESO Board for discussion. Memorandum from Technical Panel Chair Market Rule Amendment Proposal MR-00452-R00 Market Rule Amendment Proposal MR-00456-R00 Market Rule Amendment Proposal MR-00456-R01 Market Rule Amendment Proposal MR-00456-R02 Market Rule Amendment Proposal MR-00456-R03 Market Rule Amendment Proposal MR-00461-R04 IESO Staff Memo to Technical Panel Technical Panel vote and rationale Summary of Stakeholder and Technical Panel member comments Consumer Impact Assessment Draft Resolution
June 15, 2023	The Technical Panel provisionally recommended the following market rule amendment proposals to the IESO Board at it June 13, 2023 meeting. Proposed Market Rule Amendment MR-00452-R00 Proposed Market Rule Amendment MR-00456-R00 Proposed Market Rule Amendment MR-00456-R01 Proposed Market Rule Amendment MR-00456-R02 Proposed Market Rule Amendment MR-00456-R03 Proposed Market Rule Amendment MR-00461-R04
May 18, 2023	The Technical Panel requests that stakeholders review these amendment proposals and provide comments to the Technical Panel by May 26, 2023. Proposed Market Rule Amendment MR-00452-R00 Proposed Market Rule Amendment MR-00456-R00 Proposed Market Rule Amendment MR-00456-R01 Proposed Market Rule Amendment MR-00456-R02 Proposed Market Rule Amendment MR-00456-R03 Proposed Market Rule Amendment MR-00461-R04 Written Submissions Vlad Urukov Atura Power Ontario Power Generation

Last Updated	MR-00476: 2023 Capacity Auction Enhancements – Stream 1
July 18, 2023	OEB Letter
June 26, 2023	Board Decision with Reasons Market Rule Amendment Proposal Reasons of the IESO Board in respect of an amendment to the market rules Resolution of the IESO Board of Directors
June 23, 2023	Materials provided to the IESO Board for discussion. Memorandum from Technical Panel Chair Market Rule Amendment Proposal IESO Staff Memo to Technical Panel Technical Panel vote and rationale Summary of Stakeholder and Technical Panel member comments Consumer Impact Assessment Draft Resolution
June 15, 2023	The Technical Panel recommended the following market rule amendment proposal to the IESO Board at it June 13, 2023 meeting. Proposed Market Rule Amendment MR-00476-R00
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. Proposed Market Rule Amendment MR-00476-R00

Last Updated	MR-00457-R00 to R03 and MR-00461-R03: Market Renewal Program - Interim Alignment and Third Batch Definitions
June 8, 2023	Provisional Board Decision with Reasons Market Rule Amendment Proposals, please refer to the May 31, 2023 update below Reasons of the IESO Board in respect of an amendment to the market rules Resolution of the IESO Board of Directors
May 31, 2023	Materials provided to the IESO Board for discussion Memorandum from Technical Panel Chair Market Rule Amendment Proposal MR-00457-R00 Market Rule Amendment Proposal MR-00457-R01 Market Rule Amendment Proposal MR-00457-R02 Market Rule Amendment Proposal MR-00457-R03 Market Rule Amendment Proposal MR-00461-R03 IESO Staff Memo to Technical Panel Technical Panel vote and rationale Summary of Stakeholder and Technical Panel member comments Consumer Impact Assessment Draft Resolution
April 20, 2023	The Technical Panel provisionally recommended the following market rule amendment proposals to the IESO Board at its April 18, 2023 meeting. Proposed Market Rule Amendment MR-00457-R00 Proposed Market Rule Amendment MR-00457-R01 Proposed Market Rule Amendment MR-00457-R02 Proposed Market Rule Amendment MR-00457-R03 Proposed Market Rule Amendment MR-00461-R03
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. Proposed Market Rule Amendment MR-00457-R00 Proposed Market Rule Amendment MR-00457-R01 Proposed Market Rule Amendment MR-00457-R02 Proposed Market Rule Amendment MR-00457-R03 Proposed Market Rule Amendment MR-00461-R03

Last Updated	Technical Panel Terms of Reference
March 3, 2023	Memorandum from Technical Panel Chair Technical Panel vote and rationale Terms of Reference Draft Resolution

Last Updated	MR-00471-R00: Updates to Synchrophasor Monitoring Requirements
October 20, 2022	Draft Market Manual
July 7, 2022	OEB Letter
June 2, 2022	Board Decision with Reasons Market Rule Amendment Proposal Reasons of the IESO Board in respect of an amendment to the market rules Resolution of the IESO Board of Directors
May 31, 2022	Materials provided to the IESO Board for discussion. Memorandum from Technical Panel Chair Market Rule Amendment Proposal IESO Staff Memo to Technical Panel Technical Panel vote and rationale Summary of Stakeholder and Technical Panel member comments Consumer Impact Assessment Draft Resolution
April 21, 2022	The Technical Panel recommended the following market rule amendment proposal to the IESO Board at its April 19, 2022 meeting. Proposed Market Rule Amendment
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. Proposed Market Rule Amendment

Last Updated	MR-00455, MR-00461-R01: Market Renewal Program – Market Power Mitigation, Second Batch Definitions
August 25, 2022	Board Decision with Reasons Market Rule Amendment Proposal MR-00455-R00 Market Rule Amendment Proposal MR-00461-R01 Reasons of the IESO Board in respect of an amendment to the market rules Resolution of the IESO Board of Directors
August 22, 2022	Materials provided to the IESO Board for discussion. Memorandum from Technical Panel Chair Market Rule Amendment Proposal MR-00455-R00 as recommended by the Technical Panel Market Rule Amendment Proposal MR-00461-R01 as recommended by the Technical Panel IESO Staff Memo to Technical Panel Technical Panel vote and rationale Summary of Stakeholder and Technical Panel member comments Consumer Impact Assessment Draft Resolution

Last Updated

MR-00455, MR-00461-R01: Market Renewal Program – Market Power Mitigation, Second Batch Definitions

August 25, 2022

Board Decision with Reasons

August 22, 2022

Materials provided to the IESO Board for discussion.

Last Updated	MR-00461-R01: Market Renewal Program – Market Power Mitigation: Batch 2 Definitions
March 24, 2022	A majority of the Technical Panel provisionally recommended the following market rule amendment proposal to the IESO Board. Proposed Market Rule Amendment 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. Proposed Market Rule Amendment The Technical Panel requests that stakeholders review this amendment proposal and provide comments to the Technical Panel by February 3, 2022. Proposed Market Rule Amendment

Last Updated

MR-00461-R01: Market Renewal Program – Market Power Mitigation: Batch 2 Definitions

March 24, 2022

A majority of the Technical Panel provisionally recommended the following market rule amendment proposal to the IESO Board.

Proposed Market Rule Amendment

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.

Proposed Market Rule Amendment

The Technical Panel requests that stakeholders review this amendment proposal and provide comments to the Technical Panel by February 3, 2022.

Proposed Market Rule Amendment

Last Updated	MR-00455: Market Renewal Program – Market Power Mitigation
March 24, 2022	A majority of the Technical Panel provisionally recommended the following market rule amendment proposal to the IESO Board. Proposed Market Rule Amendment
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. Proposed Market Rule Amendment Written Submissions: Ontario Power Generation APPrO The Technical Panel requested that stakeholders review this amendment proposal and provide comments to the Technical Panel by February 3, 2022. Proposed Market Rule Amendments Written Submissions Ontario Power Generation Ontario Power Generation Evolugen Forrest Pengra

Last Updated

MR-00455: Market Renewal Program – Market Power Mitigation

March 24, 2022

A majority of the Technical Panel provisionally recommended the following market rule amendment proposal to the IESO Board.

Proposed Market Rule Amendment

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.

Proposed Market Rule Amendment

Written Submissions:

The Technical Panel requested that stakeholders review this amendment proposal and provide comments to the Technical Panel by February 3, 2022.

Proposed Market Rule Amendments
Written Submissions

Last Updated	MR-00450, MR-00451, MR-00453, MR-00461: Market Renewal Program – Batch 1 Market Entry and Prudential Security
June 10, 2021	Materials provided to the IESO Board for discussion. Memorandum from Technical Panel Chair Market Rule Amendment Proposal MR-00461 as recommended by the Technical Panel Market Rule Amendment Proposal MR-00453 as recommended by the Technical Panel Market Rule Amendment Proposal MR-00451 as recommended by the Technical Panel Market Rule Amendment Proposal MR-00450 as recommended by the Technical Panel IESO Staff Memo to Technical Panel Technical Panel vote and rationale Summary of Stakeholder and Technical Panel member comments Consumer Impact Assessment Draft Resolution
June 16, 2021	Provisional Board Decision with Reasons Market Rule Amendment Proposals – Please refer to June 10, 2021 Proposals Reasons of the IESO Board in respect of an amendment to the market rules

Last Updated

MR-00450, MR-00451, MR-00453, MR-00461: Market Renewal Program – Batch 1 Market Entry and Prudential Security

June 10, 2021

Materials provided to the IESO Board for discussion.

June 16, 2021

Provisional Board Decision with Reasons

Market Rule Amendment Proposals – Please refer to June 10, 2021 Proposals
Reasons of the IESO Board in respect of an amendment to the market rules

Last Updated	MR-00461: Market Renewal Program - Batch 1 Definitions
April 22, 2021	The Technical Panel provisionally recommended the following market amendment proposal to the IESO Board at its April 20, 2021 meeting. Proposed Market Rule Amendment
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. Proposed Market Rule Amendment

Last Updated

MR-00461: Market Renewal Program - Batch 1 Definitions

April 22, 2021

The Technical Panel provisionally recommended the following market amendment proposal to the IESO Board at its April 20, 2021 meeting.

Proposed Market Rule Amendment

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.

Proposed Market Rule Amendment

Last Updated	MR-00453: Market Renewal Program - Prudential Security
April 22, 2021	The Technical Panel provisionally recommended the following market amendment proposal to the IESO Board at its April 20, 2021 meeting. Proposed Market Rule Amendments
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. Proposed Market Rule Amendment

Last Updated

MR-00453: Market Renewal Program - Prudential Security

April 22, 2021

The Technical Panel provisionally recommended the following market amendment proposal to the IESO Board at its April 20, 2021 meeting.

Proposed Market Rule Amendments

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.

Proposed Market Rule Amendment

Last Updated	MR-00451: Market Renewal Program - Facility Registration
April 22, 2021	The Technical Panel provisionally recommended the following market amendment proposal to the IESO Board at its April 20, 2021 meeting. Proposed Market Rule Amendment
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. Proposed Market Rule Amendment

Last Updated

MR-00451: Market Renewal Program - Facility Registration

April 22, 2021

The Technical Panel provisionally recommended the following market amendment proposal to the IESO Board at its April 20, 2021 meeting.

Proposed Market Rule Amendment

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.

Proposed Market Rule Amendment

Last Updated	MR-00450: Market Renewal Program - Participation Authorization
April 22, 2021	The Technical Panel provisionally recommended the following market amendment proposal to the IESO Board at its April 20, 2021 meeting. Proposed Market Rule Amendment
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. Proposed Market Rule Amendment

Last Updated

MR-00450: Market Renewal Program - Participation Authorization

April 22, 2021

The Technical Panel provisionally recommended the following market amendment proposal to the IESO Board at its April 20, 2021 meeting.

Proposed Market Rule Amendment

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.

Proposed Market Rule Amendment

Change Management

Proposed Market Rule Amendments