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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 23 Jul 2024

Outage Times Systems Description
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
12:20 - 12:30 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
July 25, 2024
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
12:20 - 12:30 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).

July 29, 2024
19:00 - 20:00 EST Online IESO

There is a planned outage to Capacity Auction – Submit Capacity Enrollment and Capacity Auction Offer. 

20:30 - 21:15 EST Outage Coordination and Scheduling System (OCSS) - CROW Web Interface OCSS Web User Interface will be unavailable for outage submission and retrieval. OCSS Web Service will be unavailable for outage submission and retrieval.
July 30, 2024
10:20 - 10:40 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).

July 31, 2024
10:25 - 11:10 EST Transmission Rights Auction (TRA) will be unavailable