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Sector Participants > Calendars > Planned IT Outages

Planned IT Outages

All planned IT system outages are posted as soon as they are scheduled. Participants can view outage notification details for the same day, as well as outages planned in the future.


Participants can also view information about outages that occurred in the past 60 days by selecting Archive in the table below.

Planned Outages for 31 May 2023

Outage Times Systems Description
13:25 - 13:50 EST Dispatch Service

Automated dispatch instructions sent via Dispatch Service will be unavailable. The IESO will manually dispatch by phone as necessary. The Dispatch Service Web UI users may get disconnected and will need to login and verify connected after the outage.

Users may get disconnected and will need to login and verify access (MP action may be required).

Future Outages

Outage Times Systems Description
June 15, 2023
12:15 - 13:00 EST EMI

EMI application used to submit bids, offers, schedules and forecast will be unavailable.

Users may get disconnected and will need to login and verify access (MP action may be required).

EMI API application used to submit bids, offers, schedules and forecast will be unavailable.

Users may get disconnected and will need to login and verify access (MP action may be required).

12:15 - 13:00 EST IESO Reports Site Confidential Report publication will be delayed.

Public Report publication will be delayed.
12:15 - 16:30 EST Day-Ahead Optimization System (DAOS) The Eligible Energy Limited Resource Optimization (EELR) run of the Day-Ahead Commitment Process (DACP) DAOS will not occur:
  • EELRs will be unable to resubmit their offers for consideration in the DACP after the initial DAOS run
  • If the initial DAOS run is successful, it will be considered the Schedule of Record
12:15 - 13:00 EST Dispatch Service

Automated dispatch instructions sent via Dispatch Service will be unavailable. The IESO will manually dispatch by phone as necessary. The Dispatch Service Web UI users may get disconnected and will need to login and verify connected after the outage.

Users may get disconnected and will need to login and verify access (MP action may be required).