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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 Apr 2018

Outage Times System(s) Description
There are no scheduled outages.

Future Outages

Outage Times System(s) Description
April 24, 2018
11:30 - 11:45 EST Sandbox Portal

IESO Sandbox Portal and testing for the the following applications will be unavailable:

  • Transmission Rights Auction (TRA ) application
  • Settlements Online Forms
  • Metering (MVWeb)
  • Prudential Manager
15:15 - 15:40 EST IESO Reports Site Public Report publication will be delayed.Confidential Report publication will be delayed.
April 25, 2018
12:15 - 16:00 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
12:30 - 13:30 EST Dispatch Service Automated dispatch instructions sent via Dispatch Service will be unavailable. The IESO will manually dispatch by phone as necessary.
12:30 - 13:30 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.
12:30 - 13:30 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.
12:30 - 13:30 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.
12:30 - 13:30 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


EMI application used to submit bids, offers, schedules and forecasts will be unavailable. Market participants should confirm their bids and offers once the outage is completed.

IESO Online, used for various registration processes will not be available during the outage. The registration processes are:
  • Requesting access to the IESO systems
  • Managing your organization's contact information
  • Managing your information
  • Managing your organization's information (Emergency preparedness plans, Licences, Banking information and general information)
  • Requesting authorization to an IESO administered market or program
  • Cancelling a request for authorization
12:30 - 13:30 EST Report Site The 13:07 Predispatch report will not be published.
12:30 - 13:30 EST Report Site Confidential Report publication will be delayed.

Public Report publication will be delayed.
April 26, 2018
11:20 - 16:00 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
10:50 - 12:00 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.
April 30, 2018
15:35 - 16:15 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.
15:40 - 15:55 EST Report Site Confidential Report publication will be delayed.

Public Report publication will be delayed.
May 1, 2018
13:15 - 13:45 EST Dispatch Service Automated dispatch instructions sent via Dispatch Service will be unavailable. The IESO will manually dispatch by phone as necessary.
13:15 - 13:45 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.