Internal Demand Rates

Important Materials & Dates

Nov. 17 | Materials posted

Nov. 27 | Materials posted

Dec. 11 | Materials Posted

Dec.16 | Engagement Schedule updated

Dec.17 | ECOSS & MCOSS Dataset posted

Jan. 21, 2026 | Stakeholder feedback due

Stakeholder Update | Dec. 17, 2025

We are sharing the data used to underpin the ECOSS and MCOSS, as requested by stakeholders earlier in this engagement.

As part of the rate design options development, we will hold a stakeholder workshop on March 30&31, 2026. We plan to share 12-20 rate design options (long list) on March 10, 2026, and invite stakeholders to add to the list by March 18, 2026. These will be shared publicly and discussed during the March workshop.

Purpose & Scope

To determine how current rates for demand are (or are not) fulfilling performance expectations now or in the future and, with robust stakeholder input, design solutions that address prioritized deficiencies.

The following topics are in scope for this engagement:

  • Rate class review (including self-supply, large load, and non-firm rates)
  • Rate Demand Transmission Service (DTS) performance and potential redesign
  • Rate Demand Opportunity Service (DOS) performance review

Although there will be overlap and interdependencies, the below topics are out of scope and will either be covered in other workstreams, or are being discussed as part of standalone engagements:

  • Point of Delivery (POD) Charges – classification, allocation, and rate design
  • Ancillary Service products, services, and associated fees
  • Optimal Transmission Planning (OTP)
  • Restructured Energy Market (REM)

Engagement Schedule (Updated Dec. 16, 2025)



Important Materials & Dates

Nov. 17 | Materials posted

Nov. 27 | Materials posted

Dec. 11 | Materials Posted

Dec.16 | Engagement Schedule updated

Dec.17 | ECOSS & MCOSS Dataset posted

Jan. 21, 2026 | Stakeholder feedback due

Stakeholder Update | Dec. 17, 2025

We are sharing the data used to underpin the ECOSS and MCOSS, as requested by stakeholders earlier in this engagement.

As part of the rate design options development, we will hold a stakeholder workshop on March 30&31, 2026. We plan to share 12-20 rate design options (long list) on March 10, 2026, and invite stakeholders to add to the list by March 18, 2026. These will be shared publicly and discussed during the March workshop.

Purpose & Scope

To determine how current rates for demand are (or are not) fulfilling performance expectations now or in the future and, with robust stakeholder input, design solutions that address prioritized deficiencies.

The following topics are in scope for this engagement:

  • Rate class review (including self-supply, large load, and non-firm rates)
  • Rate Demand Transmission Service (DTS) performance and potential redesign
  • Rate Demand Opportunity Service (DOS) performance review

Although there will be overlap and interdependencies, the below topics are out of scope and will either be covered in other workstreams, or are being discussed as part of standalone engagements:

  • Point of Delivery (POD) Charges – classification, allocation, and rate design
  • Ancillary Service products, services, and associated fees
  • Optimal Transmission Planning (OTP)
  • Restructured Energy Market (REM)

Engagement Schedule (Updated Dec. 16, 2025)



  • Stakeholder Updates

    Stakeholder Update | Dec. 17, 2026

    We are sharing the data used to underpin the ECOSS and MCOSS, as requested by stakeholders earlier in this engagement.

    As part of the rate design options development, we will hold a stakeholder workshop on March 30&31, 2026. We plan to share 12-20 rate design options (long list) on March 10, 2026, and invite stakeholders to add to the list by March 18, 2026. These will be shared publicly and discussed during the March workshop.

    Stakeholder Update | October 15, 2025

    We will share the following materials with stakeholder mid-November (approximately Nov. 17) to allow stakeholders time to review prior to engaging in the next phases of this workstream:
    • Report 1: Embedded cost-of-service study (COSS) + Marginal COSS + Performance Review of existing rates
    • Report 2: Benefit of Service Study
    • Supporting Data
    • Feedback questions on the draft reports

    Save the dates:

    *These dates are tentative and being shared for transparency and planning purposes. Confirmed dates will be communicated via the Stakeholder Newsletter or by updates to this page

    Date Expected Activity
    Canceled
    Nov. 26 (1-2 hours)     		Stakeholder Q&A Session focused on the COSS Report
    We have determined that a more efficient use of time is to change the Dec. 4 & 5 sessions to hybrid participation.
    Dec. 4 & 5 (1/2 days) Hybrid Sessions on Report 1 (ECOSS + MCOSS + Performance Review)
    Dec. 10 (1/2 day) Hybrid Session on Report 2 (Benefit of Service Study)
    Jan. 21, 2026 Stakeholder Deadline to provide feedback on Draft Reports
    End of Feb 2026 AESO to Publish Reports 1 and 2
    Tentative Date
    Week of March 30, 2026     		Stakeholder Rate Option Workshop 1
    April 2026 What we heard:
    - Long list of rate options
    - AESO proposed short list of rate options shared with stakeholders
    Tentative Date
    Week of June 1, 2026     		Stakeholder Rate Option Workshop 2


    Scope of December stakeholder sessions (Dec. 4 & 5, 10):
    • Presentation on the methodologies, data, and results of the reports by the consultants that preformed the studies
    • Opportunity for stakeholders to ask clarification questions on study methods, data, and results
    • Questions related to rate options are out of scope, as this will be the topic of a subsequent phase in 2026

    Scope of Rate Option Workshop 1 (March 18-19, 2026)

    • Working session with stakeholders on scorecard refresh and the rate options that might address the rate design issues identified in Report 1

    July 9, 2025 | Consultants Selected

    Benefit of Service Study | 1-on-1 Confidential Interviews July- Aug, 2025

    We have selected a consortium of consultants to complete the Benefit of Service (BoS) study. We are excited to announce that Boost Energy Ventures, Energex Partners, and Power Team Consulting (BoS Consortium) will be completing this first of a kind study for Alberta’s electricity industry.

    The BoS Consortium will perform a quantitative and qualitative analysis to help answer: “What is the value of service from transmission connectivity in Alberta?”

    They will study 13 archetypes in grid-connected and off-grid configurations. View the summary of their methodology and archetypes.

    They will be directly engaging with electricity consumers to gather information on:

    • the value of grid service,
    • the impacts to consumers when it is interrupted (value of lost load), and
    • how they make decisions related to their electricity needs.
    The BoS Consortium representatives will be reaching out to targeted consumers in July and August, 2025. If you have comments on their methodology, are part of one of the economic sectors identified and would like to participate in the one-on-one confidential interviews with the BoS Consortium throughout July and August, please contact ISOTariffRedesign@aeso.ca.


    Cost of Service and Performance Review of Existing Rates Studies

    We have selected FTI Consulting (FTI) to support the Cost of Service studies and performance review of existing rates. We expect this work will be completed by November 2025. FTI will also support options development, bill impact analysis, mitigation measures, and application preparation in 2026.

    View more information on the delivery team.

  • Stakeholder Sessions

    December 10, 2025 | Benefit of Service Study Stakeholder Session

    Purpose

    To present the consultants’ methodology, data, and findings from the recent Benefit of Service Study (BOSS) and provide stakeholders with a live opportunity to ask questions. We aim to equip stakeholders with context needed to provide informed feedback on this report.

    Materials

    Are available under AESO Materials (either Benefit of Service Study folder or Presentations)

    December 4&5, 2025 | Cost of Service Study Stakeholder Session

    Purpose

    To present the consultants’ methodology, data, and findings from recent studies (Embedded Cost of Service Study (ECOSS), Marginal Cost of Service Study (MCOSS) and Performance Review), and provide stakeholders with a live opportunity to ask questions. We aim to equip stakeholders with context needed to provide informed feedback on this report.

    Materials

    Are available under AESO Materials (either Cost of Service Study folder or Presentations)

    April 30, 2025 | Information Session

    The AESO hosted a virtual stakeholder session on April 30 from 9:30 a.m. to 11:30 a.m. to provide stakeholders with an opportunity to ask questions and ensure alignment prior to commissioning studies and seeking the next round of written feedback.

    Purpose

    • Summarize and asses the AESO's understanding of stakeholder feedback received
    • Seek input on the AESO's draft issue prioritization
    • Q&A

    Materials

    Are available under AESO Materials (Presentations)

  • Background

    The Electric Utilities Act (EUA) requires the AESO to submit a tariff for AUC approval. The AUC has directed the AESO to refile its Bulk & Regional Tariff Design by January 31, 2027. Parties are encouraged to review documents from AUC Proceeding 26911, the last Bulk & regional Tariff application, with a particular emphasis on the Commission's decision and parties' evidentiary submissions.

    With respect to Rate DOS, parties are encouraged to review Decision 28989-D02-2024.

    Given recent amendments to the EUA, anticipated updates to the government’s Transmission Regulation, and the ongoing grid transformation, a fulsome review of Rate DTS is necessary. The AESO expects that revisions to the tariff will need to incorporate these new policy directions, recover the AESO's revenue requirements, and adhere to other rate design principles and strategic objectives to the greatest extent possible.

Page last updated: 22 Jan 2026, 11:43 AM