ISO Tariff Redesign Regulatory Consultation

Important Dates & Materials

Sept. 4 | Feedback due on TRP and Amendments for the AESO Connection Process proposed amendments

Aug. 12 | Materials posted

Amendments for the Connection ProcessSection Name
Section 3System Access Service Requests
Section 4Classification and Allocation of Connection Projects Costs
Section 5Changes to System Access Service
Section 7 (GUOC phase-out)Generating Unit Owner’s Contribution
Section 12 (subsection 12.5(7))Transmission Reinforcement Payment
Appendix ASystem Access Service Agreement Proformas
Transmission Reinforcement PaymentSection Name
Section 12 (new numbering)Transmission Reinforcement Payment
Section 3 (subsection 3.8(4) )System Access Service Requests
Administrative ChangesSection Name
Rate STSSupply Transmission Service
Rate JWind and Solar Forecasting Service Cost Recovery Rider
Section 2Provision of System Access Service
Section 6Financial Obligations for Connection Projects
Section 13 (new numbering)Miscellaneous


Purpose & Scope

This is central engagement page for regulatory work associated with the ISO Tariff Redesign Initiative. Once business engagement on the individual workstreams has concluded, related workstreams will now converge here, providing stakeholders with a single location to access information, review proposed ISO tariff Terms and Conditions amendments, and provide feedback.

The AESO is providing notice and seeking feedback from stakeholders on the development of proposed amendments to Sections 2, 3, 4, 5, 6, 7, 12, 13, Rate STS, Rider J and Appendix A of the ISO tariff (listed in the table above), as well as on the proposed CADG definitions by September 4, 2026. This first round of proposed amendments result from the TRP and Amendments for the Connection Process engagement workstreams. Feedback on the changes proposed and the TRP design has completed and is therefore out of scope.

Status updates on the different ISO Tariff Redesign workstreams:

ISO Tariff Redesign WorkstreamStatus Update
Transmission Reinforcement Payment (TRP)Regulatory consultation
Amendments for the AESO Connection Process (ACP)Regulatory consultation
Internal Demand RatesBusiness engagement ongoing
Tariff Connection ObligationsBusiness engagement ongoing
Ancillary ServicesBusiness engagement ongoing

Important Dates & Materials

Sept. 4 | Feedback due on TRP and Amendments for the AESO Connection Process proposed amendments

Aug. 12 | Materials posted

Amendments for the Connection ProcessSection Name
Section 3System Access Service Requests
Section 4Classification and Allocation of Connection Projects Costs
Section 5Changes to System Access Service
Section 7 (GUOC phase-out)Generating Unit Owner’s Contribution
Section 12 (subsection 12.5(7))Transmission Reinforcement Payment
Appendix ASystem Access Service Agreement Proformas
Transmission Reinforcement PaymentSection Name
Section 12 (new numbering)Transmission Reinforcement Payment
Section 3 (subsection 3.8(4) )System Access Service Requests
Administrative ChangesSection Name
Rate STSSupply Transmission Service
Rate JWind and Solar Forecasting Service Cost Recovery Rider
Section 2Provision of System Access Service
Section 6Financial Obligations for Connection Projects
Section 13 (new numbering)Miscellaneous


Purpose & Scope

This is central engagement page for regulatory work associated with the ISO Tariff Redesign Initiative. Once business engagement on the individual workstreams has concluded, related workstreams will now converge here, providing stakeholders with a single location to access information, review proposed ISO tariff Terms and Conditions amendments, and provide feedback.

The AESO is providing notice and seeking feedback from stakeholders on the development of proposed amendments to Sections 2, 3, 4, 5, 6, 7, 12, 13, Rate STS, Rider J and Appendix A of the ISO tariff (listed in the table above), as well as on the proposed CADG definitions by September 4, 2026. This first round of proposed amendments result from the TRP and Amendments for the Connection Process engagement workstreams. Feedback on the changes proposed and the TRP design has completed and is therefore out of scope.

Status updates on the different ISO Tariff Redesign workstreams:

ISO Tariff Redesign WorkstreamStatus Update
Transmission Reinforcement Payment (TRP)Regulatory consultation
Amendments for the AESO Connection Process (ACP)Regulatory consultation
Internal Demand RatesBusiness engagement ongoing
Tariff Connection ObligationsBusiness engagement ongoing
Ancillary ServicesBusiness engagement ongoing

  • TRP & ACP Proposed ISO Tariff Amendments | Aug. 12 - Sept. 4, 2026

    Purpose

    We invite stakeholders to provide their feedback on the Transmission Reinforcement Payment (TRP) and Amendments for the Connection Process (ACP) proposed ISO tariff Terms and Conditions revisions via the following stakeholder feedback form by end of day September 4. 

    Feedback is limited to ensuring we have accurately reflected the design and changes we have previously engaged on. Thank you for your input.

    To provide guidance for reading the proposed ISO tariff Terms and Conditions that reflect the implementation of the TRP and ACP that have been developed as part of the Tariff Redesign engagements, we have developed a guide containing supporting context.

    Instructions

    1. This feedback is open to all industry stakeholders.
    2. Please fill out the feedback form as indicated.
    3. Only one completed feedback form will be accepted per organization.
    4. To upload your completed feedback form:
      • You will need to be registered and signed in on the AESO Engage platform; and
      • Click on the "Submit feedback here" box to upload your completed feedback form.

    All responses are due by September 4, 2026, and will be shared on AESO Engage in their original format. If you have any questions, please email tariffdesign@aeso.ca 

    Stakeholder Questions

    Alternative Rate ISO Tariff Terms and Conditions

    1.  Do the proposed amendments provided in ISO tariff Section 3 and Appendix A clearly and accurately reflect the design and concepts we have engaged on thus far?

    2.  Do the proposed amendments provided in ISO tariff Section 5 clearly and accurately reflect the design and concepts we have engaged on thus far?

    3. Do the proposed amendments provided in ISO tariff Section 7 clearly and accurately reflect the design and concepts we have engaged on thus far?

    4. Do the proposed amendments provided in ISO tariff Section 12 clearly and accurately reflect the design and concepts we have engaged on thus far?

    Administrative Changes

    5. Do you have any comments on the proposed administrative changes to:

    • Rate STS
    • Rider J
    • Section 2
    • Section 4
    • Section 6
    • Section 13

    Consolidated Authoritative Definitions Guide (CADG)

    6. Do you have comments on the proposed revised CADG terms?


    Submit feedback here
Page last updated: 13 Aug 2026, 12:01 PM