May 13, 2026
Dispatch scheduling error and adjustments made for May 13 to May 21, 2025
Based on a review of real-time market results, for select intervals of trade dates from May 13, 2025 through May 21, 2025, a dispatch scheduling error (DSE) has been declared due to an incorrect calculation of internal congestion prices in real-time. Settlement statements for affected market participants determined to be impacted by the DSE will include corrective amendments in accordance with the Market Rules Ch. 7 Section 7.6.
The DSE during this period has resulted in settlement adjustment for the following charges:
- May 13, 2025: CT1101 (Real-Time Energy Settlement Amount for Generators), CT1113 (Real-Time Energy Settlement Amount for Exports), CT1115 (Non-Dispatchable Load Energy Settlement Amount)
- May 15, 2025: CT1113 (Real-Time Energy Settlement Amount for Exports), CT1115 (Non-Dispatchable Load Energy Settlement Amount)
- May 17, 2025: CT1101 (Real-Time Energy Settlement Amount for Generators), CT1103 (Real-Time Energy Settlement Amount for Dispatchable Loads), CT1109 (Real-Time Energy Settlement Amount for Virtual Transactions to Buy), CT1113 (Real-Time Energy Settlement Amount for Exports), CT1115 (Non-Dispatchable Load Energy Settlement Amount)
- May 21, 2025: CT1101 (Real-Time Energy Settlement Amount for Generators), CT1103 (Real-Time Energy Settlement Amount for Dispatchable Loads), CT1109 (Real-Time Energy Settlement Amount for Virtual Transactions to Buy), CT1113 (Real-Time Energy Settlement Amount for Exports), CT1115 (Non-Dispatchable Load Energy Settlement Amount), CT1120 (Real-Time Net Interchange Scheduling Limit Residual Uplift)
- May 31, 2025: CT 1116 (Internal Congestion and Loss Residual)
These amendments will appear on market participants’ recalculated settlement statement (RCSS-5) for May trade dates on May 14, 2026.
For more information, please contact IESOCustomerRelations@ieso.ca.