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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 Apr 2019

Outage Times Systems Description
22:25 - 22:35 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.
20:30 - 20:42 EST IESO Portal Settlements Online Forms cannot be submitted or retrievedTransmission Rights Auction (TRA) application will be unavailableAll on-line collaboration communities will be unavailableOnline Outage Request Form used for submitting or retrieving outages will be unavailablePrudential Manager used to monitor and retrieve prudential information will be unavailableMeter data cannot be retrieved.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
22:25 - 22:35 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.
23:37 - 23:47 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
Settlements Online Forms cannot be submitted or retrievedTransmission Rights Auction (TRA) application will be unavailableAll on-line collaboration communities will be unavailableOnline Outage Request Form used for submitting or retrieving outages will be unavailablePrudential Manager used to monitor and retrieve prudential information will be unavailableMeter data cannot be retrieved.
13:25 - 13:30 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.
14:25 - 14:30 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.
13:25 - 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.
14:25 - 14:30 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.

Future Outages

Outage Times Systems Description
April 24, 2019
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 Predispatch report will not be published.
April 25, 2019
08:00 - 09:00 EST Sandbox MIM Sandbox systems used for participant testing of the IESO EMI application will be unavailable.
08:00 - 11:35 EST Sandbox 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.
May 1, 2019
12:15 - 13:20 EST Dispatch Service RSS feeds for Advisory Notifications (Day 0 Advisory Notices, Day 1- 34 Advisory Notices, Emergency Advisory Notices) will stop publishing notices during the outage.
12:15 - 13:20 EST Reliability Compliance Tool OCSS Web User Interface will be unavailable for outage submission and retrieval. OCSS Web Service will be unavailable for outage submission and retrieval.
12:15 - 13:20 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 - 13:20 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.
11:50 - 13:20 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.
12:15 - 13:20 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.
12:15 - 13:20 EST Online IESO Due to planned outage Online IESO will not be available. This includes the following actions:
  • create a Notice of Disagreement (NOD)
  • create a Meter Trouble Report
  • Manage Meter Installation
  • Manage My Information
  • Manage Participation
  • Manage Enrolment Requests
  • Manage System Access
  • Submit Prudential Support Information
  • Update Organization

This also includes the following Reliability Compliance Tool actions:
  • Address Compliance Gap
  • Maintain Standards Library
  • Perform IESO Self Certification
  • Report Potential Standards Violation (IESO)
  • Report Potential Standards Violation (MP)
  • Request MP Self Certifications
12:15 - 13:20 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
Transmission Rights Auction (TRA) application will be unavailableAll on-line collaboration communities will be unavailableOnline Outage Request Form used for submitting or retrieving outages will be unavailablePrudential Manager used to monitor and retrieve prudential information will be unavailableSettlements Online Forms cannot be submitted or retrievedMeter data cannot be retrieved.
13:00 - 13:10 EST Report Site The Predispatch report will not be published.
May 8, 2019
12:15 - 13:20 EST Advisory Notifications RSS feeds for Advisory Notifications (Day 0 Advisory Notices, Day 1- 34 Advisory Notices, Emergency Advisory Notices) will stop publishing notices during the outage.
12:15 - 13:20 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.
12:15 - 13:20 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 - 13:20 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.
11:50 - 13:20 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.
12:15 - 13:20 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.
12:15 - 13:20 EST Online IESO Due to planned outage Online IESO will not be available. This includes the following actions:
  • create a Notice of Disagreement (NOD)
  • create a Meter Trouble Report
  • Manage Meter Installation
  • Manage My Information
  • Manage Participation
  • Manage Enrolment Requests
  • Manage System Access
  • Submit Prudential Support Information
  • Update Organization

This also includes the following Reliability Compliance Tool actions:
  • Address Compliance Gap
  • Maintain Standards Library
  • Perform IESO Self Certification
  • Report Potential Standards Violation (IESO)
  • Report Potential Standards Violation (MP)
  • Request MP Self Certifications
12:15 - 13:20 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
Settlements Online Forms cannot be submitted or retrievedTransmission Rights Auction (TRA) application will be unavailableAll on-line collaboration communities will be unavailableOnline Outage Request Form used for submitting or retrieving outages will be unavailablePrudential Manager used to monitor and retrieve prudential information will be unavailableMeter data cannot be retrieved.
13:00 - 13:10 EST Report Site The Predispatch report will not be published.