Restructured Energy Market (REM) ISO Rules

Important Dates & Materials

November 21 | Update to Stakeholders on the Approach to Methodological Content posted and Written Feedback open (due Dec 1)

November 20 | Opportunity Cost for Market Power Mitigation Session Summary posted and Written Feedback open (due Dec. 15)

November 19 | Dispatch Compliance and Allowable Dispatch Variance Update posted and Written Feedback open (due Dec. 1)

November 18 | Consolidated Stakeholder Written Feedback (Sept. 4 - Oct. 20, 2025)

November 12 | ADV Session Summary posted

November 6 | Stakeholder Session - Opportunity Cost for Market Power Mitigation Registration and Presentation

November 5 | Stakeholder Session - Allowable Dispatch Variance Registration and Presentation

October 20 | REM ISO Rules Stakeholder Feedback due

October 9 | Stakeholder Technical Session

October 2 | Question Board closes

September 10 | Revised Blacklines posted (see update below)

September 4 | Information and Materials


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.

Important Dates & Materials

November 21 | Update to Stakeholders on the Approach to Methodological Content posted and Written Feedback open (due Dec 1)

November 20 | Opportunity Cost for Market Power Mitigation Session Summary posted and Written Feedback open (due Dec. 15)

November 19 | Dispatch Compliance and Allowable Dispatch Variance Update posted and Written Feedback open (due Dec. 1)

November 18 | Consolidated Stakeholder Written Feedback (Sept. 4 - Oct. 20, 2025)

November 12 | ADV Session Summary posted

November 6 | Stakeholder Session - Opportunity Cost for Market Power Mitigation Registration and Presentation

November 5 | Stakeholder Session - Allowable Dispatch Variance Registration and Presentation

October 20 | REM ISO Rules Stakeholder Feedback due

October 9 | Stakeholder Technical Session

October 2 | Question Board closes

September 10 | Revised Blacklines posted (see update below)

September 4 | Information and Materials


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.

  • CLOSED: This survey has concluded.

    Purpose

    Following a stakeholder session the AESO hosted on November 5, 2025, stakeholder feedback received October 20, 2025, and discussions during the October 9, 2025 technical session, the AESO has posted the Dispatch Compliance and Allowable Dispatch Variance design. We invite interested stakeholders to provide comments by December 1, 2025. 

    Instructions

    • To submit your responses, you will need to be registered and signed in on the AESO Engage platform. 
    • Please click on the "Submit Feedback " box below to begin the survey and provide your specific comments. 
    • Please submit one completed survey per organization. 
    • All responses will be shared on AESO Engage. 
    • Responses are due by December 1, 2025.

    Questions

    1. Please provide your feedback related to the REM ISO Rules: Dispatch Compliance and Allowable Dispatch Variance
  • CLOSED: This survey has concluded.

    Purpose

    In response to stakeholder feedback received on the proposed REM ISO rules following their release on September 4, 2025, the AESO has published an update to Stakeholders on the AESO’s approach to methodological contentWe invite interested Stakeholders to provide comments by December 1, 2025. 

     

    Instructions

    1. To submit comments, you will need to have registered and be signed-in on the AESO Engage platform.
    2. Please click on the "Submit Feedback Here" box below to begin the survey and provide your specific comments.
    3. Please submit one completed survey per organization.
    4. All responses will be shared on AESO Engage.
    5. Responses are due by December 1, 2025.


  • Purpose

    We have published a summary of the Opportunity Cost Methodology for Market Power Mitigation stakeholder session on November 6, 2025. We invite interested stakeholders to review and provide additional comments by December 15, 2025. 

    Instructions

    • To submit your responses, you will need to be registered and signed in on the AESO Engage platform. 
    • Please click on the "Submit Feedback " box below to begin the survey and provide your specific comments. 
    • Please submit one completed survey per organization. 
    • All responses will be shared on AESO Engage. 
    • Responses are due by December 15, 2025.

    Questions

    1. Out of the options presented, which option are you most aligned with and why?
    2. What modifications would you propose to improve the options presented?
    3. If you think an alternative option for mitigating Energy Storage Resources (ESR) and Hydro should be pursued, can you please describe it in detail below including how it would be calculated, and how you think it would address the market power concerns of these types of resources?
    4. Are there any other considerations that the AESO should be mindful of when determining an opportunity cost level for ESR and Hydro?
    Submit Feedback
  • CLOSED: This survey has concluded.

    Instructions for Written Feedback

    What we need from Stakeholders:

    • Feedback that is authorized by an organization
    • Solution oriented written feedback on why and how specific REM ISO rule provisions should be changed  

    In Scope:

    • Feedback on whether the REM ISO rules align with the final REM design
    • Feedback on whether the REM ISO rules are technically sufficient:
      • Clear and concise
      • Complete (to the extent possible)
      • Practically implementable
      • Consistent with the statutory scheme, including the Electric Utilities Act (as amended by Bill 52)

    Out of Scope:

    • Revisiting the final REM Design


    While providing written feedback:

    • One response per organization.
    • All submissions will be published on AESO Engage, in its original state.
    • Responses due on or before 4:00 p.m. MDT on October 20, 2025.


    Note: We recommend that responses are prepared in a word document (or some other document processing system) and when ready to submit, the answers are copied and pasted for each question back into the survey response comment box. The formatting (numbering/bullets) may not appear as drafted in the survey comment response; however, the formatting is retained when the responses are exported by the AESO. 

Page last updated: 04 Dec 2025, 10:35 AM