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    Available Transfer Capability Risk Mitigation and Operational Preparedness

    The Alberta Interconnected Electric System (AIES) experienced a significant disturbance event on June 7, 2020, at 2:50 p.m. due to the tripping of the interties with British Columbia (B.C.) and Montana (MT). As a result, Alberta customers were impacted due to the activation of the province’s Under-Frequency Load Shed (UFLS) program. Additionally, on Oct. 16, 2020, the loss of a generating unit while the AIES was operating in an islanded mode led to the frequency dropping to 59.6 Hz before recovering.

    Increasing penetration levels of renewables and distributed energy resources (DER) on the system, combined with system frequency response and inertia concerns, provide a unique set of challenges in operating the grid of the future.

    An information session will be held on Tuesday, March 9, 2021, to provide an update on the June 7 and October 16, 2020 events, and to provide an overview of various initiatives that are planned or currently underway to address AESO event analysis findings and operational preparedness as the grid evolves. The initiatives include:  

    • Monitoring system inertia and arming Load Shed Service for imports (LSSi) considering system inertia
    • Modeling appropriate generation governor response in system studies
    • Working with generator facility owners on specific issues observed during AESO investigations
    • Investigating the need for synthetic inertia
    • Exploring new products and services including technology-agnostic fast frequency response (FFR)
    • Developing performance metrics to measure system and generating unit response during system events

    A copy of the presentation and the webinar recording will be posted on this website following the information session.

    The AESO will engage and collaborate with stakeholders as appropriate, as it progresses on these various initiatives. The AESO will be proactive in ensuring the continued reliability of the electricity grid, given the evolving grid and resource mix, and expects these initiatives to support this objective in the long term.

    Stakeholder Information Session

    Date and time: Tuesday, March 9, 2021  |  10:00 AM – 11:00 AM

    Please click here to register* for the session. After completing the registration form you will receive a confirmation email with a unique webinar link to join the session. It is recommended that you select the option to download the Outlook invitation to your calendar.

    *When registering, please complete the field that prompts you to enter your company name prior to your first name, i.e., Company Name + First Name (e.g., AESO Jane or AESO Joe). This makes it easier to identify you when raising your virtual hand or submitting a question during the session.

    Following the information session, the presentation will be posted to this page of, which can be found by following the path Market > Market-related initiatives > Available Transfer Capability Risk Mitigation and Operational Preparedness.

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