ISO Tariff Redesign

Important Dates & Materials

December 16, 2025

Stakeholder Update - December 16, 2025

The AESO has updated the Tariff Redesign schedule for 2026. Please refer to the respective AESO Engage pages for specific workstream schedules. Where it makes sense, we’ll consolidate engagements for multiple workstreams to maximize time and efficiency for stakeholders.

The “Connection Costs Allocation & Investment Policy” workstream has been renamed to “Tariff Connection Obligations” to reflect the broader scope including determination of costs allocated at time of connection, investment policy, connection alternatives, substation fraction review, billing and contracting for multiple points of connection and post-energization obligations in the potential case of stranded costs.

Additionally, in response to stakeholder questions about where and when certain topics will be discussed, we have posted a guide that indicates which workstream(s) where certain topics will be developed and discussed.



Purpose

To align the ISO tariff with changes to transmission and market policy so that clear and stable price signals provide investors with certainty and information needed for effective decision-making.

Focus: revising how transmission and ancillary services costs are recovered, how market participants can obtain system access service, and the costs to connect.

The Alberta Utilities Commission (AUC) deadline for the AESO to file the bulk and regional rate updates is January 31, 2027, with new rates expected to take effect in 2029 following the AUC review process.

Important Dates & Materials

December 16, 2025

Stakeholder Update - December 16, 2025

The AESO has updated the Tariff Redesign schedule for 2026. Please refer to the respective AESO Engage pages for specific workstream schedules. Where it makes sense, we’ll consolidate engagements for multiple workstreams to maximize time and efficiency for stakeholders.

The “Connection Costs Allocation & Investment Policy” workstream has been renamed to “Tariff Connection Obligations” to reflect the broader scope including determination of costs allocated at time of connection, investment policy, connection alternatives, substation fraction review, billing and contracting for multiple points of connection and post-energization obligations in the potential case of stranded costs.

Additionally, in response to stakeholder questions about where and when certain topics will be discussed, we have posted a guide that indicates which workstream(s) where certain topics will be developed and discussed.



Purpose

To align the ISO tariff with changes to transmission and market policy so that clear and stable price signals provide investors with certainty and information needed for effective decision-making.

Focus: revising how transmission and ancillary services costs are recovered, how market participants can obtain system access service, and the costs to connect.

The Alberta Utilities Commission (AUC) deadline for the AESO to file the bulk and regional rate updates is January 31, 2027, with new rates expected to take effect in 2029 following the AUC review process.

  • Stakeholder Updates

    Feb. 19, 2025

    We will be introducing the AESO's 2025 Engagement Plan with focus on Tariff activities and Transmission Reinforcement Payment (TRP) at the REM Design Finalization Week 1 on Feb. 25 - 28, 2025. Note that in-person participation is restricted to REM participants, however all stakeholders are able to listen in to the sessions.

    While the sessions are booked for the whole day, the virtual portion will end when the in-person breakouts begin, typically in the early afternoon.

    REM Design Finalization Week 1 Presentation

    Registration Details

    Week 1

    Session Focus

    Tuesday, February 25

    Understand Changes in Policy Landscape and Interdependencies

    Wednesday, February 26

    Discuss Approach for OTP

    Thursday, February 27

    Understand Intent and Approach for TRP

    Friday, February 28

    Explore and Evolve Congestion Management Design in REM

  • Stakeholder Sessions

    Kick-off Information Session | March 5, 2025

    Purpose

    This virtual session provided interested stakeholders with more information on:

    • Details about the overall ISO Tariff Redesign engagement plan;
    • Associated timelines and opportunities to participate;
    • Suggested guiding principles; and
    • A high-level overview of each workstream.

    Stakeholders had opportunities to ask questions throughout the session.

    Materials

    Available under "AESO Materials"

Page last updated: 17 Dec 2025, 02:17 PM