Technical Panel - Market Rule Amendment Determinations
October 16, 2026
The Technical Panel voted to recommend the following market rule amendment to the IESO's Board of Directors for review:
- Changes to the Establishment and Publication of Market Parameters (MR-00489-R00): This proposal revises the determination and publication framework for certain market parameters used by the day-ahead, pre-dispatch, and real-time calculation engines.
The Technical Panel is also requesting feedback on the following market rule amendments:
- Pseudo-Unit Updates: This proposal improves how pseudo-units are scheduled in day-ahead, pre-dispatch, and real-time by more accurately reflecting outages, de-rates, constraints, and ramp rates within the Dispatch Scheduling Optimizer when producing dispatch outcomes. Comments are due by October 23. Stakeholders can email their comments to rule.amendments@ieso.ca.
- Adding De-Rates to the Real-Time Lost Cost Economic Operating Point: This proposal adds de-rates to the calculation of the Real-Time Lost Cost Economic Operating Point calculations for pseudo-units. Comments are due by October 23. Stakeholders can email their comments to rule.amendments@ieso.ca.
The above amendment proposals are available on the Proposed Market Rule Amendments web page.