Important Dates & Materials

December 15 | Stakeholder Update posted (below)

December 9 | Consolidated Stakeholder Feedback posted:

• Approach to Methodological Content (Nov. 20 - Dec. 1, 2025)
• Dispatch Compliance and Allowable Dispatch Compliance (Nov. 19 - Dec. 1, 2025)

November 20 | Opportunity Cost for Market Power Mitigation Session Summary posted and Written Feedback open (due Dec. 19) *extended

Documents:

• Revised Blacklines (Sept. 10, 2025)
• Proposed REM ISO rules
• Rule Reference Document
• Table of Concordance
• Definitions
• Blacklines (Sept. 4, 2025)

December 15 | Stakeholder Update

The AESO is currently finalizing revisions to the proposed REM ISO rules in response to stakeholder feedback and anticipates the Government will create the regulation required for Ministerial approval of the REM ISO rules soon.

In its engagement materials, the AESO advised stakeholders that it would post revisions to the proposed REM ISO rules, together with the responses to stakeholder feedback, in December 2025. However, the AESO is now advising stakeholders that the revised REM ISO rules and response to feedback will instead be posted early in 2026, after the regulation for approval of the REM ISO rules has been released. At the same time, the AESO will release other supporting documents, including the third party report it has commissioned from ECCO International for an independent evaluation of the REM ISO rules with the REM final design.

For those market participants previously deemed eligible for Funding for Participation in REM Engagements, the posting of the REM ISO rules will mark the completion of stakeholder engagement. Once posted, eligible market participants will have 30 days to provide supporting documentation described in the AESO Process - Funding for REM Engagement Participation.

Purpose

The AESO has drafted REM ISO rules to align with the finalized REM design. These rules are required to implement the REM.

The AESO is engaging with stakeholders to ensure that the REM ISO rules:

• align with the finalized REM design, and
• are technically sufficient (are the rules clear, concise, reasonably self-contained, and consistent with the statutory scheme).

The REM ISO rules engagement is not intended to provide stakeholders with an opportunity to re-visit the finalized REM design.

Engagement Plan and Process

The AESO recognizes that stakeholders require information and context in order to provide meaningful feedback on the REM ISO rules. To support stakeholders, we plan to do the following:

• On September 4, 2025, from 9:00 a.m. to 12:00 p.m., the AESO will host a virtual kickoff information session to:
  • provide an overview of the scope, timeline and materials for the REM ISO rules engagement process
  • provide a high-level summary of the organization and content of the REM ISO rules, and
  • outline next steps for:
    • approval of the REM ISO rules, and
    • revisions that will be required to the REM ISO rules to address implementation and other requirements.
• Immediately following the kickoff information session, the AESO will publish the following materials for stakeholder review:
  • drafts of the REM ISO rules
  • drafts of new or revised definitions that accompany the REM ISO rules
  • a rule summary document that:
    • summarizes the content of the REM ISO rule, and
    • identifies outstanding issues to be addressed at a later date, as part of REM implementation
  • where valuable, blacklines of REM ISO rules against existing ISO rules, and
  • a table of concordance that cross-references the existing ISO rules with the draft REM ISO rules.
• The AESO will provide stakeholders with the opportunity to identify initial areas of concern or confusion with the REM ISO rules via a question board that will close on October 2, 2025.
• On October 9, 2025, the AESO will host a technical session to discuss question board comments.
• The AESO will also provide stakeholders with an opportunity to provide in-depth and detailed written feedback on each of the REM ISO rules via a separate survey forum that will be due by October 20, 2025.
• Between October 20, 2025, and December 2025, the AESO will review stakeholder feedback and consider revisions to the REM ISO rules. Additional engagement with stakeholders may be scheduled during this time if the AESO requires additional information or clarity.
• In December 2025, we will publish the AESO’s response to stakeholder feedback, as well as revised REM ISO rules. The AESO will also provide blackline comparisons of the REM ISO rules published on September 4, 2025 to the revised versions.

The REM ISO rules will be approved via Ministerial regulation. Before the end of 2025, the AESO intends to submit the revised REM ISO rules (the same rules that will be posted in December 2025) to the Minister of Affordability and Utilities for approval.