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    ISO tariff background

    Under the Electric Utilities Act, the AESO is responsible for the Independent System Operator (ISO) tariff, which consists of the rates, terms and conditions that apply to persons who receive system access service from the transmission system. The AESO submits a tariff update application to the Alberta Utilities Commission (AUC or Commission) for approval each year, and has historically filed a new, comprehensive ISO tariff application every three to four years.

    The current Consolidated ISO tariff documents and ISO tariff components are available below.

    Tariff modernization

    Introduction – the case for change

    The ISO tariff is central to many on-going changes in the Alberta electricity industry. The wires costs required to be recovered through the ISO tariff have been increasing over the past decade with completed transmission reinforcements, while new technologies such as distributed energy resources and energy storage are changing the ways the transmission system is used. The current ISO tariff rate design needs to evolve and adapt to these changes. At the same time, consumers need clear and stable price signals to be provided by the ISO tariff so they can make effective business decisions. This requires a more modern approach to tariff rates, structure and processes to keep pace and adapt as required to a rapidly changing landscape. As such, the AESO is considering both the short-term and long-term as it evolves the design of the ISO tariff in order to:

    • send price signals to incent the efficient use of transmission infrastructure;
    • effectively reflect both the cost of transmission service and the value received from a connection to the transmission system;
    • provide clear and simple price signals to users of the transmission system;
    • be adaptable to changing conditions;
    • allow market participants to innovate and provide economic value to all of Alberta; and
    • evolve the ISO tariff in a manner that is effective, but minimally disruptive.


    For further tariff modernization information and activities, please click here.

    Additional tariff-related information

    For additional tariff-related information, please click on their page link below:

    Consolidated ISO tariff documents

    ISO tariff components

    ‐ Ongoing stakeholder engagement

    Current tariff components