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Dispatch Scheduling Error Notifications

July 14, 2026

Dispatch scheduling error and adjustments made for July 29, 2025

Based on a review of the day-ahead market (DAM) results for all hours under trade date July 29, 2025, a dispatch scheduling error (DSE) has been declared due to cancelled dispatch data submissions that were inadvertently included in the DAM because of a system process disruption. Settlement statements for affected market participants determined to be impacted by the DSE will include corrective amendments in accordance with the market rules.

The DSE during this period resulted in settlement adjustment for the following charges:

  • July 29, 2025:
    • CT104 (Transmission Rights Settlement Credit)
    • CT212 (Day-Ahead 10-Minute Spinning Reserve Settlement Credit)
    • CT213 (Real-Time 10-Minute Spinning Reserve Settlement Credit)
    • CT1100 (Day-Ahead Energy Settlement Amount for Generators)
    • CT1102 (Day-Ahead Market Energy Settlement Amount for Dispatchable Loads)
    • CT1103 (Real-Time Market Energy Settlement Amount for Dispatchable Loads)
    • CT1104 (Day-Ahead Market Energy Settlement Amount for Price Responsive Loads)
    • CT1106 (Day-Ahead Energy Settlement Amount for Virtual Transactions to Sell)
    • CT1107 (Real-Time Energy Settlement Amount for Virtual Transactions to Sell)
    • CT1108 (Day-Ahead Energy Settlement Amount for Virtual Transactions to Buy)
    • CT1109 (Real-Time Energy Settlement Amount for Virtual Transactions to Buy)
    • CT1112 (Day-Ahead Energy Settlement Amount for Exports)
    • CT1113 (Real-Time Energy Settlement Amount for Exports)
    • CT1115 (Non-Dispatchable Load Energy Settlement Amount)
    • CT250 (10-Minute Spinning Reserve Hourly Uplift)
    • CT1117 (Day-Ahead Market Net External Congestion Residual)
    • CT1119 (Day-Ahead Market Net Interchange Scheduling Limit Residual Uplift)
    • CT1120 (Real-Time Net Interchange Scheduling Limit Residual Uplift)
  • July 31, 2025:
    • CT 1116 (Internal Congestion and Loss Residual)

These settlement adjustments will appear on market participants’ recalculated settlement statement (RCSS-5) on July 15, 2026.

For more information, please contact IESOCustomerRelations@ieso.ca.