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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 29 Oct 2025

Outage Times Systems Description
19:30 - 23:00 EST Online IESO

Due to planned outage Online IESO will not be available. This includes the following applications:

  1. Registration Automation System – Manage organization registration and participant authorization, Facility registration and Meter Installation processes
  2. Notice of Disagreement (NOD) – Manage the process with participants related to settlement and invoicing concerns
  3. Meter Trouble Report (MTR) - Manage the process related to correcting revenue meter errors
  4. Meter Data Management (MDM) – Manage meter data report profiles and submit ad-hoc meter data requests
  5. Prudential System - Submit Prudential Support Information
  6. Capacity Auction – Submit Capacity Qualification and Demand Response Auction Offer
  7. Reliability Compliance Tool - Manage the process of collecting submittals from participants related to NERC reliability standards
  8. Enable Capacity Export – Give the market participant the ability to sell excess capacity to neighboring jurisdictions
  9. Online Settlement Forms - Collect market participant data required to settle the market
  10. Audit Revenue Metering Installation – Add, delete, or modify existing findings, actions, and finding classifications
  11. DR Metering Audit – Submit Demand Response metering audit
  12. Manage Contributor – Manage Demand Response Contributor Registry information
  13. Non-Compliance Report – Self-report possible breaches of the market rules
  14. CDM Plan and Measures - Used by LDCs and IESO to collaborate on changes to the LDC CDM Plans
  15. Retrofit - Manage Conservation Retrofit program and Restful API to interact with Retrofit program
  16. Industrial Energy Efficiency Program (IEEP) - Support customers across Ontario in improving their industrial processes and implementing system optimization projects
  17. Beacon – Manage the process with external suppliers related to FIT and microFIT contract management
  18. Transmission Rights Auction (TRA) – Manage auctions and allow market participants to submit bids in the TR market
  19. Market Power Mitigation (MPM) – Manage registered reference levels and reference quantities, and submit temporary reference level change requests
20:30 - 23:00 EST Online IESO

Due to planned outage Online IESO will not be available. This includes the following applications:

  1. Registration Automation System – Manage organization registration and participant authorization, Facility registration and Meter Installation processes
  2. Notice of Disagreement (NOD) – Manage the process with participants related to settlement and invoicing concerns
  3. Meter Trouble Report (MTR) - Manage the process related to correcting revenue meter errors
  4. Meter Data Management (MDM) – Manage meter data report profiles and submit ad-hoc meter data requests
  5. Prudential System - Submit Prudential Support Information
  6. Capacity Auction – Submit Capacity Qualification and Demand Response Auction Offer
  7. Reliability Compliance Tool - Manage the process of collecting submittals from participants related to NERC reliability standards
  8. Enable Capacity Export – Give the market participant the ability to sell excess capacity to neighboring jurisdictions
  9. Online Settlement Forms - Collect market participant data required to settle the market
  10. Audit Revenue Metering Installation – Add, delete, or modify existing findings, actions, and finding classifications
  11. DR Metering Audit – Submit Demand Response metering audit
  12. Manage Contributor – Manage Demand Response Contributor Registry information
  13. Non-Compliance Report – Self-report possible breaches of the market rules
  14. CDM Plan and Measures - Used by LDCs and IESO to collaborate on changes to the LDC CDM Plans
  15. Retrofit - Manage Conservation Retrofit program and Restful API to interact with Retrofit program
  16. Industrial Energy Efficiency Program (IEEP) - Support customers across Ontario in improving their industrial processes and implementing system optimization projects
  17. Beacon – Manage the process with external suppliers related to FIT and microFIT contract management
  18. Transmission Rights Auction (TRA) – Manage auctions and allow market participants to submit bids in the TR market
  19. Market Power Mitigation (MPM) – Manage registered reference levels and reference quantities, and submit temporary reference level change requests

Future Outages

Outage Times Systems Description
November 5, 2025
13:15 - 15:00 EST OMB

13:15 - 13:45 EDT

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).

13:15 - 13:45 EDT

ICCP:
The Inter-Control Center Communication Protocol (ICCP) link to IESO will be unavailable.

13:15 - 13:45 EDT

IESO Reports Site:
Confidential Report publication will be delayed.

Public Report publication will be delayed.

13:15 - 13:45 EDT

UCM:
Commitment notifications will not be issued.

14:00 - 14:10 EDT

IESO Reports Site:
The Adequacy report will not be published.

14:00 - 15:00 EDT

IESO Reports Site:
The Predispatch report will not be published.