Important Dates & Materials

March 24 | Stakeholder Session | REM Implementation and Market Readiness Kick-off registration

March 12 | Stakeholder Update and Documents posted (below)

• Confirmation of REM ISO Rule Approval - Office of the Minister of Affordability and Utilities Letter
• REM ISO Rules - AESO Summary and Response to Stakeholder Written Feedback
• Restructured Energy Market ISO Rules
• REM ISO Rules Blacklines
• Table of Concordance
• ECCO Report - REM ISO Rule Independent Evaluation and Jurisdictional Review

December 30 | Consolidated Stakeholder Feedback posted - Opportunity Cost Methodology for Market Power Mitigation (Nov. 20 - Dec. 19, 2025)

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)

March 12 | Stakeholder Update

In January 2026, the AESO submitted the Restructured Energy Market (REM) ISO to Government for approval by the Minister of Affordability and Utilities.

Today, we are posting the following documents:

• Letter from the Minister confirming that the REM ISO Rules will be approved in accordance with section 20.01 of the Electric Utilities Act and the Restructured Energy Market ISO Rules Regulation.
• AESO Summary and Response to Stakeholder Written Feedback, summarizing the written feedback that the AESO received from stakeholders on the draft REM ISO rules released by the AESO on September 4, 2025, and providing the AESO’s response to that feedback;
• Revised REM ISO rules, including Consolidated Authoritative Document Glossary (CADG) terms, as well as a list of existing ISO rules and CADG terms to be rescinded prior to REM;
• Blacklines of the REM ISO rules, highlighting all changes to the draft REM ISO rules posted on September 4, 2025;
• An updated table of concordance; and
• The independent expert evaluation of ECCO International, concluding that the REM ISO rules fully align with the REM final design, and that the flexibility afforded to the AESO in the REM ISO rules is consistent with U.S. ISOs.

Please Note: The REM ISO rules have now been finalized for approval by the Minister in accordance with Section 20.01 of the Electric Utilities Act and have been published on aeso.ca. The AESO anticipates that the finalized REM ISO rules will be approved shortly through publication of a new regulation in the Alberta Gazette. Please visit AESO.ca (Rules, Standards and Tariff > REM ISO Rules) for more information.

The revised REM ISO rules mark the completion of the first iteration of the AESO’s overall engagement on the REM ISO rules. The AESO thanks stakeholders for the significant and meaningful feedback they have provided on the REM ISO rules. The AESO looks forward to continuing to engage with stakeholders on the REM ISO rules as REM implementation progresses.

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. To receive funding, eligible market participants now have 30 days (i.e., until April 13, 2026 at 4:00 p.m. MT) 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.