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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 21 Oct 2018

Outage Times Systems Description
There are no scheduled outages.

Future Outages

Outage Times Systems Description
October 23, 2018
11:30 - 11:40 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.
11:30 - 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 - 12:31 EST EMI EMI application used to submit bids, offers, schedules and forecast will be unavailable.EMI API application used to submit bids, offers, schedules and forecast will be unavailable.
13:21 - 13:33 EST EMI EMI application used to submit bids, offers, schedules and forecast will be unavailable.EMI API application used to submit bids, offers, schedules and forecast will be unavailable.
11:35 - 11:45 EST IESO Portal Prudential Manager used to monitor and retrieve prudential information will be unavailable
11:35 - 11:45 EST System Status Reports (SSR) Publication of System Status Reports will be delayed.
11:35 - 11:45 EST IESO Reports Site Public Report publication will be delayed.Confidential Report publication will be delayed.
October 24, 2018
10:50 - 11:10 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.
09:30 - 09:40 EST IESO Portal Loss of access to the IESO Portal will impact the following applications:
  • Transmission Rights Auction (TRA) application will be unavailable
  • All on-line collaboration communities will be unavailable
  • Settlements Online Forms cannot be submitted or retrieved
  • Prudential Manager used to monitor and retrieve prudential information will be unavailable
12:30 - 12:40 EST IESO Portal Loss of access to the IESO Portal will impact the following applications:
  • Transmission Rights Auction (TRA) application will be unavailable
  • All on-line collaboration communities will be unavailable
  • Settlements Online Forms cannot be submitted or retrieved
  • Prudential Manager used to monitor and retrieve prudential information will be unavailable
October 25, 2018
09:20 - 09:40 EST EMI EMI application used to submit bids, offers, schedules and forecast will be unavailable.EMI API application used to submit bids, offers, schedules and forecast will be unavailable.
10:05 - 10:25 EST EMI EMI application used to submit bids, offers, schedules and forecast will be unavailable.EMI API application used to submit bids, offers, schedules and forecast will be unavailable.
October 31, 2018
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 - 12:45 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.
12:15 - 12:45 EST Message Exchange Loss of access to Message Exchange will result in the following applications being impacted:
  • Automated dispatch instructions will be unavailable. The IESO will manually dispatch by phone as necessary.
13:00 - 13:10 EST Report Site The 13:07 Predispatch report will not be published.