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 18 Oct 2025

Outage Times	Systems	Description
There are no scheduled outages.

Future Outages

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Outage Date
System
Archive

Outage Times	Systems	Description
October 20, 2025
12:15 - 12:45 EST	IESO Reports Site	Confidential Report publication will be delayed. Public Report publication will be delayed.
12:15 - 12:45 EST	Online IESO	Due to planned outage Online IESO will not be available. This includes the following applications: Registration Automation System – Manage organization registration and participant authorization, Facility registration and Meter Installation processes Notice of Disagreement (NOD) – Manage the process with participants related to settlement and invoicing concerns Meter Trouble Report (MTR) - Manage the process related to correcting revenue meter errors Meter Data Management (MDM) – Manage meter data report profiles and submit ad-hoc meter data requests Prudential System - Submit Prudential Support Information Capacity Auction – Submit Capacity Qualification and Demand Response Auction Offer Reliability Compliance Tool - Manage the process of collecting submittals from participants related to NERC reliability standards Enable Capacity Export – Give the market participant the ability to sell excess capacity to neighboring jurisdictions Online Settlement Forms - Collect market participant data required to settle the market Audit Revenue Metering Installation – Add, delete, or modify existing findings, actions, and finding classifications DR Metering Audit – Submit Demand Response metering audit Manage Contributor – Manage Demand Response Contributor Registry information Non-Compliance Report – Self-report possible breaches of the market rules CDM Plan and Measures - Used by LDCs and IESO to collaborate on changes to the LDC CDM Plans Retrofit - Manage Conservation Retrofit program and Restful API to interact with Retrofit program Industrial Energy Efficiency Program (IEEP) - Support customers across Ontario in improving their industrial processes and implementing system optimization projects Beacon – Manage the process with external suppliers related to FIT and microFIT contract management Transmission Rights Auction (TRA) – Manage auctions and allow market participants to submit bids in the TR market Market Power Mitigation (MPM) – Manage registered reference levels and reference quantities, and submit temporary reference level change requests
October 21, 2025
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. Users may get disconnected and will need to login and verify access (MP action may be required).
12:15 - 12:45 EST	EMI	Energy Market Interface (EMI) will be unavailable. EMI is the Web UI component of the Market Information Management (MIM) solution used to submit dispatch data. Users may get disconnected and will need to login and verify access eMIM API will be unavailable. eMIM is the MIM Application Programming Interface used to submit dispatch data. Users may get disconnected and will need to login and verify access.
October 29, 2025
20:30 - 23:00 EST	Online IESO	Due to planned outage Online IESO will not be available. This includes the following applications: Registration Automation System – Manage organization registration and participant authorization, Facility registration and Meter Installation processes Notice of Disagreement (NOD) – Manage the process with participants related to settlement and invoicing concerns Meter Trouble Report (MTR) - Manage the process related to correcting revenue meter errors Meter Data Management (MDM) – Manage meter data report profiles and submit ad-hoc meter data requests Prudential System - Submit Prudential Support Information Capacity Auction – Submit Capacity Qualification and Demand Response Auction Offer Reliability Compliance Tool - Manage the process of collecting submittals from participants related to NERC reliability standards Enable Capacity Export – Give the market participant the ability to sell excess capacity to neighboring jurisdictions Online Settlement Forms - Collect market participant data required to settle the market Audit Revenue Metering Installation – Add, delete, or modify existing findings, actions, and finding classifications DR Metering Audit – Submit Demand Response metering audit Manage Contributor – Manage Demand Response Contributor Registry information Non-Compliance Report – Self-report possible breaches of the market rules CDM Plan and Measures - Used by LDCs and IESO to collaborate on changes to the LDC CDM Plans Retrofit - Manage Conservation Retrofit program and Restful API to interact with Retrofit program Industrial Energy Efficiency Program (IEEP) - Support customers across Ontario in improving their industrial processes and implementing system optimization projects Beacon – Manage the process with external suppliers related to FIT and microFIT contract management Transmission Rights Auction (TRA) – Manage auctions and allow market participants to submit bids in the TR market Market Power Mitigation (MPM) – Manage registered reference levels and reference quantities, and submit temporary reference level change requests
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.

Outage Times	Date	Description
IESO Reports Site
12:15 - 12:45 EST	October 20, 2025	Confidential Report publication will be delayed. Public Report publication will be delayed.
Online IESO
12:15 - 12:45 EST	October 20, 2025	Due to planned outage Online IESO will not be available. This includes the following applications: Registration Automation System – Manage organization registration and participant authorization, Facility registration and Meter Installation processes Notice of Disagreement (NOD) – Manage the process with participants related to settlement and invoicing concerns Meter Trouble Report (MTR) - Manage the process related to correcting revenue meter errors Meter Data Management (MDM) – Manage meter data report profiles and submit ad-hoc meter data requests Prudential System - Submit Prudential Support Information Capacity Auction – Submit Capacity Qualification and Demand Response Auction Offer Reliability Compliance Tool - Manage the process of collecting submittals from participants related to NERC reliability standards Enable Capacity Export – Give the market participant the ability to sell excess capacity to neighboring jurisdictions Online Settlement Forms - Collect market participant data required to settle the market Audit Revenue Metering Installation – Add, delete, or modify existing findings, actions, and finding classifications DR Metering Audit – Submit Demand Response metering audit Manage Contributor – Manage Demand Response Contributor Registry information Non-Compliance Report – Self-report possible breaches of the market rules CDM Plan and Measures - Used by LDCs and IESO to collaborate on changes to the LDC CDM Plans Retrofit - Manage Conservation Retrofit program and Restful API to interact with Retrofit program Industrial Energy Efficiency Program (IEEP) - Support customers across Ontario in improving their industrial processes and implementing system optimization projects Beacon – Manage the process with external suppliers related to FIT and microFIT contract management Transmission Rights Auction (TRA) – Manage auctions and allow market participants to submit bids in the TR market Market Power Mitigation (MPM) – Manage registered reference levels and reference quantities, and submit temporary reference level change requests
20:30 - 23:00 EST	October 29, 2025	Due to planned outage Online IESO will not be available. This includes the following applications: Registration Automation System – Manage organization registration and participant authorization, Facility registration and Meter Installation processes Notice of Disagreement (NOD) – Manage the process with participants related to settlement and invoicing concerns Meter Trouble Report (MTR) - Manage the process related to correcting revenue meter errors Meter Data Management (MDM) – Manage meter data report profiles and submit ad-hoc meter data requests Prudential System - Submit Prudential Support Information Capacity Auction – Submit Capacity Qualification and Demand Response Auction Offer Reliability Compliance Tool - Manage the process of collecting submittals from participants related to NERC reliability standards Enable Capacity Export – Give the market participant the ability to sell excess capacity to neighboring jurisdictions Online Settlement Forms - Collect market participant data required to settle the market Audit Revenue Metering Installation – Add, delete, or modify existing findings, actions, and finding classifications DR Metering Audit – Submit Demand Response metering audit Manage Contributor – Manage Demand Response Contributor Registry information Non-Compliance Report – Self-report possible breaches of the market rules CDM Plan and Measures - Used by LDCs and IESO to collaborate on changes to the LDC CDM Plans Retrofit - Manage Conservation Retrofit program and Restful API to interact with Retrofit program Industrial Energy Efficiency Program (IEEP) - Support customers across Ontario in improving their industrial processes and implementing system optimization projects Beacon – Manage the process with external suppliers related to FIT and microFIT contract management Transmission Rights Auction (TRA) – Manage auctions and allow market participants to submit bids in the TR market Market Power Mitigation (MPM) – Manage registered reference levels and reference quantities, and submit temporary reference level change requests
Dispatch Service
12:15 - 12:45 EST	October 21, 2025	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).
EMI
12:15 - 12:45 EST	October 21, 2025	Energy Market Interface (EMI) will be unavailable. EMI is the Web UI component of the Market Information Management (MIM) solution used to submit dispatch data. Users may get disconnected and will need to login and verify access eMIM API will be unavailable. eMIM is the MIM Application Programming Interface used to submit dispatch data. Users may get disconnected and will need to login and verify access.
OMB
13:15 - 15:00 EST	November 5, 2025	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.

Outage Times	Systems	Description
October 17, 2025
13:00 EST - 13:30 EST	EMI	Energy Market Interface (EMI) will be unavailable. EMI is the Web UI component of the Market Information Management (MIM) solution used to submit dispatch data. Users may get disconnected and will need to login and verify access eMIM API will be unavailable. eMIM is the MIM Application Programming Interface used to submit dispatch data. Users may get disconnected and will need to login and verify access.
08:00 EST - 18:00 EST	Sandbox System and Applications	Sandbox systems used for participant testing of IESO applications, including the IESO Sandbox Portal, Sandbox Reports Site, Sandbox EMI, and Sandbox Online IESO, will be unavailable.
October 15, 2025
10:30 EST - 11:00 EST	EMI	Energy Market Interface (EMI) will be unavailable. EMI is the Web UI component of the Market Information Management (MIM) solution used to submit dispatch data. Users may get disconnected and will need to login and verify access eMIM API will be unavailable. eMIM is the MIM Application Programming Interface used to submit dispatch data. Users may get disconnected and will need to login and verify access.
October 9, 2025
10:30 - 11:00 EST	EMI	Energy Market Interface (EMI) will be unavailable. EMI is the Web UI component of the Market Information Management (MIM) solution used to submit dispatch data. Users may get disconnected and will need to login and verify access
09:30 - 10:00 EST	Sandbox MIM	MRP Sandbox MIM Web Services and Sandbox MIM IDK used to submit dispatch data will be unavailable.MRP Sandbox EMI application used to submit dispatch data will be unavailable. Market participants should confirm their dispatch data once the outage is completed.
October 8, 2025
14:00 - 16:00 EDT	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.
October 7, 2025
12:25 - 13:05 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).
15:30 - 15:50 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).
October 2, 2025
13:00 - 14:00 EST	IESO Reports Site	The Predispatch report will not be published.
September 29, 2025
11:00 - 12:00 EST	Outage Coordination and Scheduling System (OCSS) - CROW Web Interface	Hydro One and Ontario Power Generation cannot submit or retrieve outages through OCSS. OCSS Web User Interface will be unavailable for outage submission and retrieval.
11:00 - 12:00 EST	Outage Coordination and Scheduling System (OCSS) - Web Service (API)	OCSS Web Service will be unavailable for outage submission and retrieval.
September 12, 2025
14:30 - 15:30 EST	Online IESO	Due to planned outages the following actions will not be available in Online IESO: Prudential System - Submit Prudential Support Information.
September 9, 2025
14:00 - 16:00 EDT	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.
August 22, 2025
12:30 - 13:00 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).
12:30 - 13:00 EST	EMI	Energy Market Interface (EMI) will be unavailable. EMI is the Web UI component of the Market Information Management (MIM) solution used to submit dispatch data. Users may get disconnected and will need to login and verify access eMIM API will be unavailable. eMIM is the MIM Application Programming Interface used to submit dispatch data. Users may get disconnected and will need to login and verify access.
August 8, 2025
00:30 - 00:40 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).
03:30 - 03:40 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).
00:30 - 00:40 EST	EMI	Energy Market Interface (EMI) will be unavailable. EMI is the Web UI component of the Market Information Management (MIM) solution used to submit dispatch data. Users may get disconnected and will need to login and verify access eMIM API will be unavailable. eMIM is the MIM Application Programming Interface used to submit dispatch data. Users may get disconnected and will need to login and verify access.
03:30 - 03:40 EST	EMI	Energy Market Interface (EMI) will be unavailable. EMI is the Web UI component of the Market Information Management (MIM) solution used to submit dispatch data. Users may get disconnected and will need to login and verify access eMIM API will be unavailable. eMIM is the MIM Application Programming Interface used to submit dispatch data. Users may get disconnected and will need to login and verify access.
00:30 - 00:40 EST	Report Site	Report site will be unavailable and publication of public and confidential Reports will be delayed.
03:30 - 03:40 EST	Report Site	Report site will be unavailable and publication of public and confidential Reports will be delayed.
August 6, 2025
02:40 - 03:25 EST	TRA	Transmission Rights Auction (TRA) will be unavailable
14:00 - 16:00 EDT	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.
August 5, 2025
01:35 - 02:10 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. Users may get disconnected and will need to login and verify access (MP action may be required).
10:20 - 10:39 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).
01:35 - 02:10 EST	EMI	Energy Market Interface (EMI) will be unavailable. EMI is the Web UI component of the Market Information Management (MIM) solution used to submit dispatch data. Users may get disconnected and will need to login and verify access eMIM API will be unavailable. eMIM is the MIM Application Programming Interface used to submit dispatch data. Users may get disconnected and will need to login and verify access.
01:35 - 02:10 EST	Online IESO	Due to planned outage Online IESO will not be available. This includes the following applications: Registration Automation System – Manage organization registration and participant authorization, Facility registration and Meter Installation processes Notice of Disagreement (NOD) – Manage the process with participants related to settlement and invoicing concerns Meter Trouble Report (MTR) - Manage the process related to correcting revenue meter errors Meter Data Management (MDM) – Manage meter data report profiles and submit ad-hoc meter data requests Prudential System - Submit Prudential Support Information Capacity Auction – Submit Capacity Qualification and Demand Response Auction Offer Reliability Compliance Tool - Manage the process of collecting submittals from participants related to NERC reliability standards Enable Capacity Export – Give the market participant the ability to sell excess capacity to neighboring jurisdictions Online Settlement Forms - Collect market participant data required to settle the market Audit Revenue Metering Installation – Add, delete, or modify existing findings, actions, and finding classifications DR Metering Audit – Submit Demand Response metering audit Manage Contributor – Manage Demand Response Contributor Registry information Non-Compliance Report – Self-report possible breaches of the market rules CDM Plan and Measures - Used by LDCs and IESO to collaborate on changes to the LDC CDM Plans Retrofit - Manage Conservation Retrofit program and Restful API to interact with Retrofit program Industrial Energy Efficiency Program (IEEP) - Support customers across Ontario in improving their industrial processes and implementing system optimization projects Beacon – Manage the process with external suppliers related to FIT and microFIT contract management Transmission Rights Auction (TRA) – Manage auctions and allow market participants to submit bids in the TR market Market Power Mitigation (MPM) – Manage registered reference levels and reference quantities, and submit temporary reference level change requests
01:35 - 02:10 EST	TRA	Transmission Rights Auction (TRA) will be unavailable
August 4, 2025
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 23, 2025
12:30 - 12:45 EST	IESO Reports Site	Confidential Report publication will be delayed. Public Report publication will be delayed.
12:30 - 12:45 EST	Online IESO	Due to planned outage Online IESO will not be available. This includes the following applications: Registration Automation System – Manage organization registration and participant authorization, Facility registration and Meter Installation processes Notice of Disagreement (NOD) – Manage the process with participants related to settlement and invoicing concerns Meter Trouble Report (MTR) - Manage the process related to correcting revenue meter errors Meter Data Management (MDM) – Manage meter data report profiles and submit ad-hoc meter data requests Prudential System - Submit Prudential Support Information Capacity Auction – Submit Capacity Qualification and Demand Response Auction Offer Reliability Compliance Tool - Manage the process of collecting submittals from participants related to NERC reliability standards Enable Capacity Export – Give the market participant the ability to sell excess capacity to neighboring jurisdictions Online Settlement Forms - Collect market participant data required to settle the market Audit Revenue Metering Installation – Add, delete, or modify existing findings, actions, and finding classifications DR Metering Audit – Submit Demand Response metering audit Manage Contributor – Manage Demand Response Contributor Registry information Non-Compliance Report – Self-report possible breaches of the market rules CDM Plan and Measures - Used by LDCs and IESO to collaborate on changes to the LDC CDM Plans Retrofit - Manage Conservation Retrofit program and Restful API to interact with Retrofit program Industrial Energy Efficiency Program (IEEP) - Support customers across Ontario in improving their industrial processes and implementing system optimization projects Beacon – Manage the process with external suppliers related to FIT and microFIT contract management Transmission Rights Auction (TRA) – Manage auctions and allow market participants to submit bids in the TR market Market Power Mitigation (MPM) – Manage registered reference levels and reference quantities, and submit temporary reference level change requests
12:30 - 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. Users may get disconnected and will need to login and verify access (MP action may be required).
12:30 - 12:45 EST	EMI	Energy Market Interface (EMI) will be unavailable. EMI is the Web UI component of the Market Information Management (MIM) solution used to submit dispatch data. Users may get disconnected and will need to login and verify access eMIM API will be unavailable. eMIM is the MIM Application Programming Interface used to submit dispatch data. Users may get disconnected and will need to login and verify access.
July 22, 2025
04:00 - 06:00 EST	Online IESO	Due to planned outage Online IESO will not be available. This includes the following applications: Registration Automation System – Manage organization registration and participant authorization, Facility registration and Meter Installation processes Notice of Disagreement (NOD) – Manage the process with participants related to settlement and invoicing concerns Meter Trouble Report (MTR) - Manage the process related to correcting revenue meter errors Meter Data Management (MDM) – Manage meter data report profiles and submit ad-hoc meter data requests Prudential System - Submit Prudential Support Information Capacity Auction – Submit Capacity Qualification and Demand Response Auction Offer Reliability Compliance Tool - Manage the process of collecting submittals from participants related to NERC reliability standards Enable Capacity Export – Give the market participant the ability to sell excess capacity to neighboring jurisdictions Online Settlement Forms - Collect market participant data required to settle the market Audit Revenue Metering Installation – Add, delete, or modify existing findings, actions, and finding classifications DR Metering Audit – Submit Demand Response metering audit Manage Contributor – Manage Demand Response Contributor Registry information Non-Compliance Report – Self-report possible breaches of the market rules CDM Plan and Measures - Used by LDCs and IESO to collaborate on changes to the LDC CDM Plans Retrofit - Manage Conservation Retrofit program and Restful API to interact with Retrofit program Industrial Energy Efficiency Program (IEEP) - Support customers across Ontario in improving their industrial processes and implementing system optimization projects Beacon – Manage the process with external suppliers related to FIT and microFIT contract management Transmission Rights Auction (TRA) – Manage auctions and allow market participants to submit bids in the TR market Market Power Mitigation (MPM) – Manage registered reference levels and reference quantities, and submit temporary reference level change requests
July 21, 2025
13:30 -13:55 EST	EMI	Energy Market Interface (EMI) will be unavailable. EMI is the Web UI component of the Market Information Management (MIM) solution used to submit dispatch data. Users may get disconnected and will need to login and verify access eMIM API will be unavailable. eMIM is the MIM Application Programming Interface used to submit dispatch data. Users may get disconnected and will need to login and verify access.
19:00 - 21:00 EST	Sandbox Online IESO	Due to planned outage Sandbox Online IESO will not be available. This includes the following actions: Registration Automation System – Manage organization registration and participant authorization, Facility registration and Meter Installation processes. Notice of Disagreement (NOD) – Manage the process with participants related to settlement and invoicing concerns. Meter Trouble Report (MTR) – Manages the process related to correcting revenue meter errors. Meter Data Management (MDM) – Manage meter data report profiles and submit ad-hoc meter data requests. Prudential System – Submit Prudential Support Information. Capacity Auction – Submit Capacity Qualification and Demand Response Auction Offer. Reliability Compliance Tool – Manage the process of collecting submittals from participants related to NERC reliability standards. Enable Capacity Export – Give the market participant the ability to sell excess capacity to neighboring jurisdictions. Online Settlement Forms – Collect market participant data required to settle the market. CDM Plan and Measures – Used by LDCs and IESO to collaborate on changes to the LDC CDM Plans. Retrofit – Manage Conservation Retrofit program and Restful API to interact with Retrofit program. Transmission Rights Auction (TRA) – Manage auctions and allow market participants to submit bids in the TR market. Market Power Mitigation (MPM) – Manage registered reference levels and reference quantities, and submit temporary reference level change requests
July 18, 2025
00:01 - 17:00 EST	Sandbox System and Applications	Sandbox systems used for participant testing of IESO applications, including the IESO Sandbox Portal, Sandbox Reports Site, Sandbox EMI, and Sandbox Online IESO, will be unavailable.
July 17, 2025
08:30 - 09:30 EST	Sandbox MIM	Sandbox MIM Web Services and Sandbox MIM IDK used to submit dispatch data will be unavailable.
16:00 - 23:59 EST	Sandbox System and Applications	Sandbox systems used for participant testing of IESO applications, including the IESO Sandbox Portal, Sandbox Reports Site, Sandbox EMI, and Sandbox Online IESO, will be unavailable.
June 24, 2025
09:30 - 10:00 EST	EMI	Energy Market Interface (EMI) will be unavailable. EMI is the Web UI component of the Market Information Management (MIM) solution used to submit dispatch data. Users may get disconnected and will need to login and verify access
09:00 - 09:30 EST	Sandbox MIM	MRP Sandbox EMI application used to submit dispatch data will be unavailable. Market participants should confirm their dispatch data once the outage is completed.
June 19, 2025
14:00 - 16:00 EDT	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.
May 31, 2025
1030 - 1035 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).
12:30 - 12:35 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. Users may get disconnected and will need to login and verify access (MP action may be required).
13:30 - 13:35 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. Users may get disconnected and will need to login and verify access (MP action may be required).
12:30 - 12:35 EST	EMI	Energy Market Interface (EMI) will be unavailable. EMI is the Web UI component of the Market Information Management (MIM) solution used to submit dispatch data. Users may get disconnected and will need to login and verify access eMIM API will be unavailable. eMIM is the MIM Application Programming Interface used to submit dispatch data. Users may get disconnected and will need to login and verify access.
13:30 - 13:35 EST	EMI	Energy Market Interface (EMI) will be unavailable. EMI is the Web UI component of the Market Information Management (MIM) solution used to submit dispatch data. Users may get disconnected and will need to login and verify access eMIM API will be unavailable. eMIM is the MIM Application Programming Interface used to submit dispatch data. Users may get disconnected and will need to login and verify access.
09:30 - 09:35 EST	Report Site	Report site will be unavailable and publication of public and confidential Reports will be delayed.
12:30 - 12:35 EST	IESO Reports Site	Report site will be unavailable and publication of public and confidential Reports will be delayed.
13:30 - 13:35 EST	IESO Reports Site	Report site will be unavailable and publication of public and confidential Reports will be delayed.
12:30 - 12:35 EST	IESO Workspaces	All workspaces will be unavailable during this period.
13:30 - 13:35 EST	IESO Workspaces	All workspaces will be unavailable during this period.
May 24, 2025
10:40 - 10:45 EST	Outage Coordination and Scheduling System (OCSS) - CROW Web Interface	Hydro One and Ontario Power Generation cannot submit or retrieve outages through OCSS. OCSS Web User Interface will be unavailable for outage submission and retrieval.
12:20 - 12:25 EST	Outage Coordination and Scheduling System (OCSS) - CROW Web Interface	Hydro One and Ontario Power Generation cannot submit or retrieve outages through OCSS. OCSS Web User Interface will be unavailable for outage submission and retrieval.
12:20 - 12:25 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).
10:40 - 10:45 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. Users may get disconnected and will need to login and verify access (MP action may be required).
10:40 - 10:45 EST	EMI	Energy Market Interface (EMI) will be unavailable. EMI is the Web UI component of the Market Information Management (MIM) solution used to submit dispatch data. Users may get disconnected and will need to login and verify access eMIM API will be unavailable. eMIM is the MIM Application Programming Interface used to submit dispatch data. Users may get disconnected and will need to login and verify access.
12:20 - 12:25 EST	EMI	Energy Market Interface (EMI) will be unavailable. EMI is the Web UI component of the Market Information Management (MIM) solution used to submit dispatch data. Users may get disconnected and will need to login and verify access eMIM API will be unavailable. eMIM is the MIM Application Programming Interface used to submit dispatch data. Users may get disconnected and will need to login and verify access.
10:40 - 10:45 EST	ICCP	The Inter-Control Center Communication Protocol (ICCP) link to IESO will be unavailable.
12:20 - 12:25 EST	ICCP	The Inter-Control Center Communication Protocol (ICCP) link to IESO will be unavailable.
10:40 - 10:45 EST	IESO Website	Market data such as Demand, Supply and Price will not be updated on the Home Page or the Power Data Page. RSS feeds such as Advisory Notices and DAM notifications will not be updated in the Sector Participants section.
12:20 - 12:25 EST	IESO Website	Market data such as Demand, Supply and Price will not be updated on the Home Page or the Power Data Page. RSS feeds such as Advisory Notices and DAM notifications will not be updated in the Sector Participants section.
10:40 - 10:45 EST	IESO Workspaces	All workspaces will be unavailable during this period.
12:20 - 12:25 EST	IESO Workspaces	All workspaces will be unavailable during this period.
10:40 - 10:45 EST	Online IESO	Due to planned outage Online IESO will not be available. This includes the following applications: Registration Automation System – Manage organization registration and participant authorization, Facility registration and Meter Installation processes Notice of Disagreement (NOD) – Manage the process with participants related to settlement and invoicing concerns Meter Trouble Report (MTR) - Manage the process related to correcting revenue meter errors Meter Data Management (MDM) – Manage meter data report profiles and submit ad-hoc meter data requests Prudential System - Submit Prudential Support Information Capacity Auction – Submit Capacity Qualification and Demand Response Auction Offer Reliability Compliance Tool - Manage the process of collecting submittals from participants related to NERC reliability standards Enable Capacity Export – Give the market participant the ability to sell excess capacity to neighboring jurisdictions Online Settlement Forms - Collect market participant data required to settle the market Audit Revenue Metering Installation – Add, delete, or modify existing findings, actions, and finding classifications DR Metering Audit – Submit Demand Response metering audit Manage Contributor – Manage Demand Response Contributor Registry information Non-Compliance Report – Self-report possible breaches of the market rules CDM Plan and Measures - Used by LDCs and IESO to collaborate on changes to the LDC CDM Plans Retrofit - Manage Conservation Retrofit program and Restful API to interact with Retrofit program Industrial Energy Efficiency Program (IEEP) - Support customers across Ontario in improving their industrial processes and implementing system optimization projects Beacon – Manage the process with external suppliers related to FIT and microFIT contract management Transmission Rights Auction (TRA) – Manage auctions and allow market participants to submit bids in the TR market Market Power Mitigation (MPM) – Manage registered reference levels and reference quantities, and submit temporary reference level change requests
12:20 - 12:25 EST	Online IESO	Due to planned outage Online IESO will not be available. This includes the following applications: Registration Automation System – Manage organization registration and participant authorization, Facility registration and Meter Installation processes Notice of Disagreement (NOD) – Manage the process with participants related to settlement and invoicing concerns Meter Trouble Report (MTR) - Manage the process related to correcting revenue meter errors Meter Data Management (MDM) – Manage meter data report profiles and submit ad-hoc meter data requests Prudential System - Submit Prudential Support Information Capacity Auction – Submit Capacity Qualification and Demand Response Auction Offer Reliability Compliance Tool - Manage the process of collecting submittals from participants related to NERC reliability standards Enable Capacity Export – Give the market participant the ability to sell excess capacity to neighboring jurisdictions Online Settlement Forms - Collect market participant data required to settle the market Audit Revenue Metering Installation – Add, delete, or modify existing findings, actions, and finding classifications DR Metering Audit – Submit Demand Response metering audit Manage Contributor – Manage Demand Response Contributor Registry information Non-Compliance Report – Self-report possible breaches of the market rules CDM Plan and Measures - Used by LDCs and IESO to collaborate on changes to the LDC CDM Plans Retrofit - Manage Conservation Retrofit program and Restful API to interact with Retrofit program Industrial Energy Efficiency Program (IEEP) - Support customers across Ontario in improving their industrial processes and implementing system optimization projects Beacon – Manage the process with external suppliers related to FIT and microFIT contract management Transmission Rights Auction (TRA) – Manage auctions and allow market participants to submit bids in the TR market Market Power Mitigation (MPM) – Manage registered reference levels and reference quantities, and submit temporary reference level change requests
10:40 - 10:45 EST	Report Site	Public Report publication will be delayed.
12:20 - 12:25 EST	Report Site	Public Report publication will be delayed.
May 2, 2025
6:00 - 7:30 EST	Outage Coordination and Scheduling System (OCSS) - CROW Web Interface	Hydro One and Ontario Power Generation cannot submit or retrieve outages through OCSS. OCSS Web User Interface will be unavailable for outage submission and retrieval.
April 30, 2025
23:10 - 23:25 EST	ICCP	The Inter-Control Center Communication Protocol (ICCP) link to IESO will be unavailable.
April 23, 2025
18:30 - 21:00 EST	Online IESO	Due to planned outage Online IESO will not be available. This includes the following applications: Registration Automation System – Manage organization registration and participant authorization, Facility registration and Meter Installation processes Notice of Disagreement (NOD) – Manage the process with participants related to settlement and invoicing concerns Meter Trouble Report (MTR) - Manage the process related to correcting revenue meter errors Meter Data Management (MDM) – Manage meter data report profiles and submit ad-hoc meter data requests Prudential System - Submit Prudential Support Information Capacity Auction – Submit Capacity Qualification and Demand Response Auction Offer Reliability Compliance Tool - Manage the process of collecting submittals from participants related to NERC reliability standards Enable Capacity Export – Give the market participant the ability to sell excess capacity to neighboring jurisdictions Online Settlement Forms - Collect market participant data required to settle the market Audit Revenue Metering Installation – Add, delete, or modify existing findings, actions, and finding classifications DR Metering Audit – Submit Demand Response metering audit Manage Contributor – Manage Demand Response Contributor Registry information Non-Compliance Report – Self-report possible breaches of the market rules CDM Plan and Measures - Used by LDCs and IESO to collaborate on changes to the LDC CDM Plans Retrofit - Manage Conservation Retrofit program and Restful API to interact with Retrofit program Industrial Energy Efficiency Program (IEEP) - Support customers across Ontario in improving their industrial processes and implementing system optimization projects Beacon – Manage the process with external suppliers related to FIT and microFIT contract management Transmission Rights Auction (TRA) – Manage auctions and allow market participants to submit bids in the TR market Market Power Mitigation (MPM) – Manage registered reference levels and reference quantities, and submit temporary reference level change requests
April 14, 2025
14:30 - 14:40 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).
April 2, 2025
12:00 - 13:00 EST	Report Site	The Adequacy report will not be published.
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. Users may get disconnected and will need to login and verify access (MP action may be required).
12:15 - 12:45 EST	ICCP	The Inter-Control Center Communication Protocol (ICCP) link to IESO will be unavailable.
13:00 - 13:10 EST	IESO Reports Site	The Predispatch report will not be published.
12:15 - 12:45 EST	IESO Reports Site	Confidential Report publication will be delayed. Public Report publication will be delayed.
March 12, 2025
01:20 - 01:30 EST	ICCP	The Inter-Control Center Communication Protocol (ICCP) link to IESO will be unavailable.
March 8, 2025
12:20 - 12:50 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).
12:20 - 12:50 EST	EMI	Energy Market Interface (EMI) will be unavailable. EMI is the Web UI component of the Market Information Management (MIM) solution used to submit dispatch data. Users may get disconnected and will need to login and verify access eMIM API will be unavailable. eMIM is the MIM Application Programming Interface used to submit dispatch data. Users may get disconnected and will need to login and verify access.
12:20 - 12:50 EST	Online IESO	Due to planned outage Online IESO will not be available. This includes the following applications: Registration Automation System – Manage organization registration and participant authorization, Facility registration and Meter Installation processes Notice of Disagreement (NOD) – Manage the process with participants related to settlement and invoicing concerns Meter Trouble Report (MTR) - Manage the process related to correcting revenue meter errors Meter Data Management (MDM) – Manage meter data report profiles and submit ad-hoc meter data requests Prudential System - Submit Prudential Support Information Capacity Auction – Submit Capacity Qualification and Demand Response Auction Offer Reliability Compliance Tool - Manage the process of collecting submittals from participants related to NERC reliability standards Enable Capacity Export – Give the market participant the ability to sell excess capacity to neighboring jurisdictions Online Settlement Forms - Collect market participant data required to settle the market Audit Revenue Metering Installation – Add, delete, or modify existing findings, actions, and finding classifications DR Metering Audit – Submit Demand Response metering audit Manage Contributor – Manage Demand Response Contributor Registry information Non-Compliance Report – Self-report possible breaches of the market rules CDM Plan and Measures - Used by LDCs and IESO to collaborate on changes to the LDC CDM Plans Retrofit - Manage Conservation Retrofit program and Restful API to interact with Retrofit program Industrial Energy Efficiency Program (IEEP) - Support customers across Ontario in improving their industrial processes and implementing system optimization projects Beacon – Manage the process with external suppliers related to FIT and microFIT contract management Transmission Rights Auction (TRA) – Manage auctions and allow market participants to submit bids in the TR market Market Power Mitigation (MPM) – Manage registered reference levels and reference quantities, and submit temporary reference level change requests
March 5, 2025
10:20 - 10:39 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).
01:50 - 02:35 EST	TRA	Transmission Rights Auction (TRA) will be unavailable
13:00 - 14:00 EST	IESO Reports Site	The Adequacy report will not be published.
13:15 - 17:30 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
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. 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 EST	ICCP	The Inter-Control Center Communication Protocol (ICCP) link to IESO will be unavailable.
14:00 - 14:10 EST	IESO Reports Site	The Predispatch report will not be published.
13:15 - 13:45 EST	IESO Reports Site	Confidential Report publication will be delayed. Public Report publication will be delayed.
March 4, 2025
10:20 - 10:35 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. Users may get disconnected and will need to login and verify access (MP action may be required).
13:15 - 17:30 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
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. 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 EST	ICCP	The Inter-Control Center Communication Protocol (ICCP) link to IESO will be unavailable.
14:00 - 14:10 EST	IESO Reports Site	The Predispatch report will not be published.
13:15 - 13:45 EST	IESO Reports Site	Confidential Report publication will be delayed. Public Report publication will be delayed.
13:00 - 14:00 EST	IESO Reports Site	The Adequacy report will not be published.
March 3, 2025
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.
February 26, 2025
13:00 - 14:00 EST	IESO Reports Site	The Adequacy report will not be published.
13:15 - 17:30 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
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. 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).
14:00 - 14:10 EST	IESO Reports Site	The Predispatch report will not be published.
13:15 - 13:45 EST	IESO Reports Site	Confidential Report publication will be delayed. Public Report publication will be delayed.
13:15 - 13:45	ICCP	The Inter-Control Center Communication Protocol (ICCP) link to IESO will be unavailable.
February 21, 2025
13:00 - 16:00 EST	Sandbox Dispatch Service	MRP Sandbox EMI application used to submit dispatch data will be unavailable. Market participants should confirm their dispatch data once the outage is completed. Outage does not impact submission through API.
13:00 - 16:00 EST	Sandbox MIM	MRP Sandbox MIM Web Services and Sandbox MIM IDK used to submit dispatch data will be unavailable.
13:00 - 16:00 EST	Sandbox IESO Reports Site	Testing on the Sandbox Report site will be unavailable
January 30, 2025
10:30 - 11:00 EST	Outage Coordination and Scheduling System (OCSS) - CROW Web Interface	Hydro One and Ontario Power Generation cannot submit or retrieve outages through OCSS. OCSS Web User Interface will be unavailable for outage submission and retrieval.
10:30 - 11:00 EST	Outage Coordination and Scheduling System (OCSS) - Web Service (API)	OCSS Web Service will be unavailable for outage submission and retrieval.
January 27, 2025
18:00 - 22:00 EST	Online IESO	Due to planned outage Online IESO will not be available. This includes the following applications: Registration Automation System – Manage organization registration and participant authorization, Facility registration and Meter Installation processes Notice of Disagreement (NOD) – Manage the process with participants related to settlement and invoicing concerns Meter Trouble Report (MTR) - Manage the process related to correcting revenue meter errors Meter Data Management (MDM) – Manage meter data report profiles and submit ad-hoc meter data requests Prudential System - Submit Prudential Support Information Capacity Auction – Submit Capacity Qualification and Demand Response Auction Offer Reliability Compliance Tool - Manage the process of collecting submittals from participants related to NERC reliability standards Enable Capacity Export – Give the market participant the ability to sell excess capacity to neighboring jurisdictions Online Settlement Forms - Collect market participant data required to settle the market Audit Revenue Metering Installation – Add, delete, or modify existing findings, actions, and finding classifications DR Metering Audit – Submit Demand Response metering audit Manage Contributor – Manage Demand Response Contributor Registry information Non-Compliance Report – Self-report possible breaches of the market rules CDM Plan and Measures - Used by LDCs and IESO to collaborate on changes to the LDC CDM Plans Retrofit - Manage Conservation Retrofit program and Restful API to interact with Retrofit program Industrial Energy Efficiency Program (IEEP) - Support customers across Ontario in improving their industrial processes and implementing system optimization projects Beacon – Manage the process with external suppliers related to FIT and microFIT contract management Transmission Rights Auction (TRA) – Manage auctions and allow market participants to submit bids in the TR market Market Power Mitigation (MPM) – Manage registered reference levels and reference quantities, and submit temporary reference level change requests
January 23, 2025
13:00 - 14:00	IESO Reports Site	The Adequacy report will not be published.
13:15 - 17:30 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
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. 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).
14:00 - 14:10 EST	IESO Reports Site	The Predispatch report will not be published.
13:15 - 13:45 EST	IESO Reports Site	Confidential Report publication will be delayed. Public Report publication will be delayed.
January 16, 2025
14:15 - 14:30 EST	EMI	Energy Market Interface (EMI) will be unavailable. EMI is the Web UI component of the Market Information Management (MIM) solution used to submit dispatch data. Users may get disconnected and will need to login and verify access eMIM API will be unavailable. eMIM is the MIM Application Programming Interface used to submit dispatch data. Users may get disconnected and will need to login and verify access.
14:00 - 14:15 EST	Sandbox MIM	Sandbox MIM Web Services and Sandbox MIM IDK used to submit dispatch data will be unavailable.
January 14, 2025
13:14 - 14:15 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).
10:00 - 12:00 EST	Sandbox MIM	MRP Sandbox MIM Web Services and Sandbox MIM IDK used to submit dispatch data will be unavailable.
January 13, 2025
10:00 - 12:00 EST	Sandbox MIM	MRP Sandbox MIM Web Services and Sandbox MIM IDK used to submit dispatch data will be unavailable.
January 10, 2025
13:00 - 14:20 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. Users may get disconnected and will need to login and verify access (MP action may be required).
13:00 - 14:20 EST	Report Site	Confidential Report publication will be delayed. Public Report publication will be delayed.
13:00 - 14:20 EST	EMI	Energy Market Interface (EMI) will be unavailable. EMI is the Web UI component of the Market Information Management (MIM) solution used to submit dispatch data. Users may get disconnected and will need to login and verify access eMIM API will be unavailable. eMIM is the MIM Application Programming Interface used to submit dispatch data. Users may get disconnected and will need to login and verify access.
January 9, 2025
13:15 - 14:15 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).
14:00 - 15:20 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. Users may get disconnected and will need to login and verify access (MP action may be required).
14:00 - 15:00 EST	IESO Reports Site	Confidential Report publication will be delayed. Public Report publication will be delayed.
14:00 - 15:00 EST	EMI	Energy Market Interface (EMI) will be unavailable. EMI is the Web UI component of the Market Information Management (MIM) solution used to submit dispatch data. Users may get disconnected and will need to login and verify access eMIM API will be unavailable. eMIM is the MIM Application Programming Interface used to submit dispatch data. Users may get disconnected and will need to login and verify access.
January 7, 2025
10:20 - 10:30 EST	EMI	Energy Market Interface (EMI) will be unavailable. EMI is the Web UI component of the Market Information Management (MIM) solution used to submit dispatch data. Users may get disconnected and will need to login and verify access
December 19, 2024
12:20 - 17:30 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
13:27 - 13:43 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).
December 18, 2024
14:00 - 15:00 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).
14:00 - 15:00 EST	IESO Reports Site	Confidential Report publication will be delayed. Public Report publication will be delayed.
14:00 - 15:00 EST	EMI	Energy Market Interface (EMI) will be unavailable. EMI is the Web UI component of the Market Information Management (MIM) solution used to submit dispatch data. Users may get disconnected and will need to login and verify access eMIM API will be unavailable. eMIM is the MIM Application Programming Interface used to submit dispatch data. Users may get disconnected and will need to login and verify access.
December 17, 2024
12:20 - 17:30 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
December 16, 2024
14:00 - 15:00 EST	EMI	Energy Market Interface (EMI) will be unavailable. EMI is the Web UI component of the Market Information Management (MIM) solution used to submit dispatch data. Users may get disconnected and will need to login and verify access eMIM API will be unavailable. eMIM is the MIM Application Programming Interface used to submit dispatch data. Users may get disconnected and will need to login and verify access.
December 13, 2024
14:00 - 15:00 EST	IESO Reports Site	Confidential Report publication will be delayed. Public Report publication will be delayed.
14:00 - 15:00 EST	Online IESO	Due to planned outage Online IESO will not be available. This includes the following applications: Registration Automation System – Manage organization registration and participant authorization, Facility registration and Meter Installation processes Notice of Disagreement (NOD) – Manage the process with participants related to settlement and invoicing concerns Meter Trouble Report (MTR) - Manage the process related to correcting revenue meter errors Meter Data Management (MDM) – Manage meter data report profiles and submit ad-hoc meter data requests Prudential System - Submit Prudential Support Information Capacity Auction – Submit Capacity Qualification and Demand Response Auction Offer Reliability Compliance Tool - Manage the process of collecting submittals from participants related to NERC reliability standards Enable Capacity Export – Give the market participant the ability to sell excess capacity to neighboring jurisdictions Online Settlement Forms - Collect market participant data required to settle the market Audit Revenue Metering Installation – Add, delete, or modify existing findings, actions, and finding classifications DR Metering Audit – Submit Demand Response metering audit Manage Contributor – Manage Demand Response Contributor Registry information Non-Compliance Report – Self-report possible breaches of the market rules CDM Plan and Measures - Used by LDCs and IESO to collaborate on changes to the LDC CDM Plans Retrofit - Manage Conservation Retrofit program and Restful API to interact with Retrofit program Industrial Energy Efficiency Program (IEEP) - Support customers across Ontario in improving their industrial processes and implementing system optimization projects Beacon – Manage the process with external suppliers related to FIT and microFIT contract management Transmission Rights Auction (TRA) – Manage auctions and allow market participants to submit bids in the TR market Market Power Mitigation (MPM) – Manage registered reference levels and reference quantities, and submit temporary reference level change requests
December 12, 2024
12:20 - 17:30 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 - 13:15 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).
12:15 - 13:15 EST	IESO Reports Site	The Predispatch report will not be published.
12:15 - 13:15 EST	IESO Reports Site	Confidential Report publication will be delayed. Public Report publication will be delayed.
10:05 - 10:15 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).
December 11, 2024
13:15 - 17:30 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. Users may get disconnected and will need to login and verify access (MP action may be required).
13:00 - 13:10 EST	Report Site	The Predispatch report will not be published.
12:15 - 12:45 EST	IESO Reports Site	Confidential Report publication will be delayed. Public Report publication will be delayed.
13:00 - 14:00	Report Site	The Adequacy report will not be published.
December 10, 2024
12:20 - 17:30 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
13:27 - 13:43 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).
December 9, 2024
14:00 - 15:00 EST	IESO Reports Site	Confidential Report publication will be delayed. Public Report publication will be delayed.
14:00 - 15:00 EST	Online IESO	Due to planned outage Online IESO will not be available. This includes the following applications: Registration Automation System – Manage organization registration and participant authorization, Facility registration and Meter Installation processes Notice of Disagreement (NOD) – Manage the process with participants related to settlement and invoicing concerns Meter Trouble Report (MTR) - Manage the process related to correcting revenue meter errors Meter Data Management (MDM) – Manage meter data report profiles and submit ad-hoc meter data requests Prudential System - Submit Prudential Support Information Capacity Auction – Submit Capacity Qualification and Demand Response Auction Offer Reliability Compliance Tool - Manage the process of collecting submittals from participants related to NERC reliability standards Enable Capacity Export – Give the market participant the ability to sell excess capacity to neighboring jurisdictions Online Settlement Forms - Collect market participant data required to settle the market Audit Revenue Metering Installation – Add, delete, or modify existing findings, actions, and finding classifications DR Metering Audit – Submit Demand Response metering audit Manage Contributor – Manage Demand Response Contributor Registry information Non-Compliance Report – Self-report possible breaches of the market rules CDM Plan and Measures - Used by LDCs and IESO to collaborate on changes to the LDC CDM Plans Retrofit - Manage Conservation Retrofit program and Restful API to interact with Retrofit program Industrial Energy Efficiency Program (IEEP) - Support customers across Ontario in improving their industrial processes and implementing system optimization projects Beacon – Manage the process with external suppliers related to FIT and microFIT contract management Transmission Rights Auction (TRA) – Manage auctions and allow market participants to submit bids in the TR market Market Power Mitigation (MPM) – Manage registered reference levels and reference quantities, and submit temporary reference level change requests
12:20 - 17:30 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
13:27 - 13:43 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).
December 4, 2024
12:20 - 17:30 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
13:25 - 13:40 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).
07:00 - 08:00 EST	TRA	Transmission Rights Auction (TRA) will be unavailable
December 2, 2024
08:00 - 09:00 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.
10:20 - 10:35 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. Users may get disconnected and will need to login and verify access (MP action may be required).
November 26, 2024
10:00 - 11:00 EST	IESO Reports Site	Confidential Report publication will be delayed. Public Report publication will be delayed.
10:00 - 11:00 EST	Online IESO	Due to planned outage Online IESO will not be available. This includes the following applications: Registration Automation System – Manage organization registration and participant authorization, Facility registration and Meter Installation processes Notice of Disagreement (NOD) – Manage the process with participants related to settlement and invoicing concerns Meter Trouble Report (MTR) - Manage the process related to correcting revenue meter errors Meter Data Management (MDM) – Manage meter data report profiles and submit ad-hoc meter data requests Prudential System - Submit Prudential Support Information Capacity Auction – Submit Capacity Qualification and Demand Response Auction Offer Reliability Compliance Tool - Manage the process of collecting submittals from participants related to NERC reliability standards Enable Capacity Export – Give the market participant the ability to sell excess capacity to neighboring jurisdictions Online Settlement Forms - Collect market participant data required to settle the market Audit Revenue Metering Installation – Add, delete, or modify existing findings, actions, and finding classifications DR Metering Audit – Submit Demand Response metering audit Manage Contributor – Manage Demand Response Contributor Registry information Non-Compliance Report – Self-report possible breaches of the market rules CDM Plan and Measures - Used by LDCs and IESO to collaborate on changes to the LDC CDM Plans Retrofit - Manage Conservation Retrofit program and Restful API to interact with Retrofit program Industrial Energy Efficiency Program (IEEP) - Support customers across Ontario in improving their industrial processes and implementing system optimization projects Beacon – Manage the process with external suppliers related to FIT and microFIT contract management Transmission Rights Auction (TRA) – Manage auctions and allow market participants to submit bids in the TR market Market Power Mitigation (MPM) – Manage registered reference levels and reference quantities, and submit temporary reference level change requests
10:00 - 11:00 EST	TRA	Transmission Rights Auction (TRA) will be unavailable
November 18, 2024
08:00 - 09:30 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).
November 13, 2024
13:00 - 14:00 EST	IESO Reports Site	The Adequacy report will not be published.
13:15 - 17:30 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. Users may get disconnected and will need to login and verify access (MP action may be required).
13:00 - 13:10 EST	IESO Reports Site	The Predispatch report will not be published.
12:15 - 12:45 EST	IESO Reports Site	Confidential Report publication will be delayed. Public Report publication will be delayed.
October 30, 2024
09:15 - 09:45 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. Users may get disconnected and will need to login and verify access (MP action may be required).
09:15 - 09:45 EST	IESO Reports Site	Confidential Report publication will be delayed. Public Report publication will be delayed.
October 29, 2024
09:15 - 09:45 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. Users may get disconnected and will need to login and verify access (MP action may be required).
09:15 - 09:45 EST	EMI	Energy Market Interface (EMI) will be unavailable. EMI is the Web UI component of the Market Information Management (MIM) solution used to submit dispatch data. Users may get disconnected and will need to login and verify access eMIM API will be unavailable. eMIM is the MIM Application Programming Interface used to submit dispatch data. Users may get disconnected and will need to login and verify access.
October 28, 2024
09:15 - 09:45 EST	Report Site	Confidential Report publication will be delayed. Public Report publication will be delayed.
09:15 - 09:45 EST	Online IESO	Due to planned outage Online IESO will not be available. This includes the following applications: Registration Automation System – Manage organization registration and participant authorization, Facility registration and Meter Installation processes Notice of Disagreement (NOD) – Manage the process with participants related to settlement and invoicing concerns Meter Trouble Report (MTR) - Manage the process related to correcting revenue meter errors Meter Data Management (MDM) – Manage meter data report profiles and submit ad-hoc meter data requests Prudential System - Submit Prudential Support Information Capacity Auction – Submit Capacity Qualification and Demand Response Auction Offer Reliability Compliance Tool - Manage the process of collecting submittals from participants related to NERC reliability standards Enable Capacity Export – Give the market participant the ability to sell excess capacity to neighboring jurisdictions Online Settlement Forms - Collect market participant data required to settle the market Audit Revenue Metering Installation – Add, delete, or modify existing findings, actions, and finding classifications DR Metering Audit – Submit Demand Response metering audit Manage Contributor – Manage Demand Response Contributor Registry information Non-Compliance Report – Self-report possible breaches of the market rules CDM Plan and Measures - Used by LDCs and IESO to collaborate on changes to the LDC CDM Plans Retrofit - Manage Conservation Retrofit program and Restful API to interact with Retrofit program Industrial Energy Efficiency Program (IEEP) - Support customers across Ontario in improving their industrial processes and implementing system optimization projects Beacon – Manage the process with external suppliers related to FIT and microFIT contract management Transmission Rights Auction (TRA) – Manage auctions and allow market participants to submit bids in the TR market Market Power Mitigation (MPM) – Manage registered reference levels and reference quantities, and submit temporary reference level change requests
09:15 - 09:45 EST	TRA	Transmission Rights Auction (TRA) will be unavailable
18:30 - 21:00 EST	Online IESO	Due to planned outage Online IESO will not be available. This includes the following applications: Registration Automation System – Manage organization registration and participant authorization, Facility registration and Meter Installation processes Notice of Disagreement (NOD) – Manage the process with participants related to settlement and invoicing concerns Meter Trouble Report (MTR) - Manage the process related to correcting revenue meter errors Meter Data Management (MDM) – Manage meter data report profiles and submit ad-hoc meter data requests Prudential System - Submit Prudential Support Information Capacity Auction – Submit Capacity Qualification and Demand Response Auction Offer Reliability Compliance Tool - Manage the process of collecting submittals from participants related to NERC reliability standards Enable Capacity Export – Give the market participant the ability to sell excess capacity to neighboring jurisdictions Online Settlement Forms - Collect market participant data required to settle the market Audit Revenue Metering Installation – Add, delete, or modify existing findings, actions, and finding classifications DR Metering Audit – Submit Demand Response metering audit Manage Contributor – Manage Demand Response Contributor Registry information Non-Compliance Report – Self-report possible breaches of the market rules CDM Plan and Measures - Used by LDCs and IESO to collaborate on changes to the LDC CDM Plans Retrofit - Manage Conservation Retrofit program and Restful API to interact with Retrofit program Industrial Energy Efficiency Program (IEEP) - Support customers across Ontario in improving their industrial processes and implementing system optimization projects Beacon – Manage the process with external suppliers related to FIT and microFIT contract management Transmission Rights Auction (TRA) – Manage auctions and allow market participants to submit bids in the TR market Market Power Mitigation (MPM) – Manage registered reference levels and reference quantities, and submit temporary reference level change requests
October 24, 2024
18:30 - 21:00 EST	Online IESO	Due to planned outage Online IESO will not be available. This includes the following applications: Registration Automation System – Manage organization registration and participant authorization, Facility registration and Meter Installation processes Notice of Disagreement (NOD) – Manage the process with participants related to settlement and invoicing concerns Meter Trouble Report (MTR) - Manage the process related to correcting revenue meter errors Meter Data Management (MDM) – Manage meter data report profiles and submit ad-hoc meter data requests Prudential System - Submit Prudential Support Information Capacity Auction – Submit Capacity Qualification and Demand Response Auction Offer Reliability Compliance Tool - Manage the process of collecting submittals from participants related to NERC reliability standards Enable Capacity Export – Give the market participant the ability to sell excess capacity to neighboring jurisdictions Online Settlement Forms - Collect market participant data required to settle the market Audit Revenue Metering Installation – Add, delete, or modify existing findings, actions, and finding classifications DR Metering Audit – Submit Demand Response metering audit Manage Contributor – Manage Demand Response Contributor Registry information Non-Compliance Report – Self-report possible breaches of the market rules CDM Plan and Measures - Used by LDCs and IESO to collaborate on changes to the LDC CDM Plans Retrofit - Manage Conservation Retrofit program and Restful API to interact with Retrofit program Industrial Energy Efficiency Program (IEEP) - Support customers across Ontario in improving their industrial processes and implementing system optimization projects Beacon – Manage the process with external suppliers related to FIT and microFIT contract management Transmission Rights Auction (TRA) – Manage auctions and allow market participants to submit bids in the TR market Market Power Mitigation (MPM) – Manage registered reference levels and reference quantities, and submit temporary reference level change requests
16:30 - 20:00 EST	Sandbox Online IESO	Due to planned outage Sandbox Online IESO will not be available. This includes the following actions: Registration Automation System – Manage organization registration and participant authorization, Facility registration and Meter Installation processes. Notice of Disagreement (NOD) – Manage the process with participants related to settlement and invoicing concerns. Meter Trouble Report (MTR) – Manages the process related to correcting revenue meter errors. Meter Data Management (MDM) – Manage meter data report profiles and submit ad-hoc meter data requests. Prudential System – Submit Prudential Support Information. Capacity Auction – Submit Capacity Qualification and Demand Response Auction Offer. Reliability Compliance Tool – Manage the process of collecting submittals from participants related to NERC reliability standards. Enable Capacity Export – Give the market participant the ability to sell excess capacity to neighboring jurisdictions. Online Settlement Forms – Collect market participant data required to settle the market. CDM Plan and Measures – Used by LDCs and IESO to collaborate on changes to the LDC CDM Plans. Retrofit – Manage Conservation Retrofit program and Restful API to interact with Retrofit program. Transmission Rights Auction (TRA) – Manage auctions and allow market participants to submit bids in the TR market. Market Power Mitigation (MPM) – Manage registered reference levels and reference quantities, and submit temporary reference level change requests
October 23, 2024
09:25 - 09:45 EST	IESO Reports Site	Report site will be unavailable and publication of public and confidential Reports will be delayed.
October 18, 2024
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. 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 EST	IESO Reports Site	Confidential Report publication will be delayed. Public Report publication will be delayed.
October 17, 2024
10:15 - 10:45 EST	EMI	Energy Market Interface (EMI) will be unavailable. EMI is the Web UI component of the Market Information Management (MIM) solution used to submit dispatch data. Users may get disconnected and will need to login and verify access eMIM API will be unavailable. eMIM is the MIM Application Programming Interface used to submit dispatch data. Users may get disconnected and will need to login and verify access.
October 16, 2024
13:00 - 14:00 EST	IESO Reports Site	The Adequacy report will not be published.
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
13:00 - 13:10 EST	IESO Reports Site	The Predispatch report will not be published.
12:15 - 12:45 EST	IESO Reports Site	Confidential Report publication will be delayed. Public Report publication will be delayed.
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. Users may get disconnected and will need to login and verify access (MP action may be required).
October 15, 2024
13:15 - 13:45 EST	Online IESO	Due to planned outage Online IESO will not be available. This includes the following applications: Registration Automation System – Manage organization registration and participant authorization, Facility registration and Meter Installation processes Notice of Disagreement (NOD) – Manage the process with participants related to settlement and invoicing concerns Meter Trouble Report (MTR) - Manage the process related to correcting revenue meter errors Meter Data Management (MDM) – Manage meter data report profiles and submit ad-hoc meter data requests Prudential System - Submit Prudential Support Information Capacity Auction – Submit Capacity Qualification and Demand Response Auction Offer Reliability Compliance Tool - Manage the process of collecting submittals from participants related to NERC reliability standards Enable Capacity Export – Give the market participant the ability to sell excess capacity to neighboring jurisdictions Online Settlement Forms - Collect market participant data required to settle the market Audit Revenue Metering Installation – Add, delete, or modify existing findings, actions, and finding classifications DR Metering Audit – Submit Demand Response metering audit Manage Contributor – Manage Demand Response Contributor Registry information Non-Compliance Report – Self-report possible breaches of the market rules CDM Plan and Measures - Used by LDCs and IESO to collaborate on changes to the LDC CDM Plans Retrofit - Manage Conservation Retrofit program and Restful API to interact with Retrofit program Industrial Energy Efficiency Program (IEEP) - Support customers across Ontario in improving their industrial processes and implementing system optimization projects Beacon – Manage the process with external suppliers related to FIT and microFIT contract management Transmission Rights Auction (TRA) – Manage auctions and allow market participants to submit bids in the TR market Market Power Mitigation (MPM) – Manage registered reference levels and reference quantities, and submit temporary reference level change requests
10:15 - 10:45 EST	IESO Reports Site	Confidential Report publication will be delayed. Public Report publication will be delayed.
13:15 - 13:45 EST	TRA	Transmission Rights Auction (TRA) will be unavailable
October 10, 2024
13:15 - 13:45	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).
September 18, 2024
09:15 - 09:45 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. Users may get disconnected and will need to login and verify access (MP action may be required).
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. Users may get disconnected and will need to login and verify access (MP action may be required).
September 11, 2024
13:00 - 14:00 EST	IESO Reports Site	The Adequacy report will not be published.
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. Users may get disconnected and will need to login and verify access (MP action may be required).
13:00 - 13:10 EST	IESO Reports Site	The Predispatch report will not be published.
12:15 - 12:45 EST	IESO Reports Site	Confidential Report publication will be delayed. Public Report publication will be delayed.
September 10, 2024
10:00 - 10:30 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.
10:00 - 10:30 EST	Outage Coordination and Scheduling System (OCSS) - CROW Web Interface	OCSS Web User Interface will be unavailable for outage submission and retrieval. Hydro One and Ontario Power Generation cannot submit or retrieve outages through OCSS.
September 7, 2024
12:40 - 12:45 EST	Online IESO	Due to planned outage Online IESO will not be available. This includes the following applications: Registration Automation System – Manage organization registration and participant authorization, Facility registration and Meter Installation processes Notice of Disagreement (NOD) – Manage the process with participants related to settlement and invoicing concerns Meter Trouble Report (MTR) - Manage the process related to correcting revenue meter errors Meter Data Management (MDM) – Manage meter data report profiles and submit ad-hoc meter data requests Prudential System - Submit Prudential Support Information Capacity Auction – Submit Capacity Qualification and Demand Response Auction Offer Reliability Compliance Tool - Manage the process of collecting submittals from participants related to NERC reliability standards Enable Capacity Export – Give the market participant the ability to sell excess capacity to neighboring jurisdictions Online Settlement Forms - Collect market participant data required to settle the market Audit Revenue Metering Installation – Add, delete, or modify existing findings, actions, and finding classifications DR Metering Audit – Submit Demand Response metering audit Manage Contributor – Manage Demand Response Contributor Registry information Non-Compliance Report – Self-report possible breaches of the market rules CDM Plan and Measures - Used by LDCs and IESO to collaborate on changes to the LDC CDM Plans Retrofit - Manage Conservation Retrofit program and Restful API to interact with Retrofit program Industrial Energy Efficiency Program (IEEP) - Support customers across Ontario in improving their industrial processes and implementing system optimization projects Beacon – Manage the process with external suppliers related to FIT and microFIT contract management Transmission Rights Auction (TRA) – Manage auctions and allow market participants to submit bids in the TR market Market Power Mitigation (MPM) – Manage registered reference levels and reference quantities, and submit temporary reference level change requests
13:00 - 13:05 EST	Online IESO	Due to planned outage Online IESO will not be available. This includes the following applications: Registration Automation System – Manage organization registration and participant authorization, Facility registration and Meter Installation processes Notice of Disagreement (NOD) – Manage the process with participants related to settlement and invoicing concerns Meter Trouble Report (MTR) - Manage the process related to correcting revenue meter errors Meter Data Management (MDM) – Manage meter data report profiles and submit ad-hoc meter data requests Prudential System - Submit Prudential Support Information Capacity Auction – Submit Capacity Qualification and Demand Response Auction Offer Reliability Compliance Tool - Manage the process of collecting submittals from participants related to NERC reliability standards Enable Capacity Export – Give the market participant the ability to sell excess capacity to neighboring jurisdictions Online Settlement Forms - Collect market participant data required to settle the market Audit Revenue Metering Installation – Add, delete, or modify existing findings, actions, and finding classifications DR Metering Audit – Submit Demand Response metering audit Manage Contributor – Manage Demand Response Contributor Registry information Non-Compliance Report – Self-report possible breaches of the market rules CDM Plan and Measures - Used by LDCs and IESO to collaborate on changes to the LDC CDM Plans Retrofit - Manage Conservation Retrofit program and Restful API to interact with Retrofit program Industrial Energy Efficiency Program (IEEP) - Support customers across Ontario in improving their industrial processes and implementing system optimization projects Beacon – Manage the process with external suppliers related to FIT and microFIT contract management Transmission Rights Auction (TRA) – Manage auctions and allow market participants to submit bids in the TR market Market Power Mitigation (MPM) – Manage registered reference levels and reference quantities, and submit temporary reference level change requests
13:40 - 13:45 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. Users may get disconnected and will need to login and verify access (MP action may be required).
August 27, 2024
09:30 - 11:00 EST	Sandbox MIM	MRP Sandbox EMI application used to submit dispatch data will be unavailable. Market participants should confirm their dispatch data once the outage is completed.
August 21, 2024
17:00 - 19:00 EST	Online IESO	Due to planned outage Online IESO will not be available. This includes the following applications: Registration Automation System – Manage organization registration and participant authorization, Facility registration and Meter Installation processes Notice of Disagreement (NOD) – Manage the process with participants related to settlement and invoicing concerns Meter Trouble Report (MTR) - Manage the process related to correcting revenue meter errors Meter Data Management (MDM) – Manage meter data report profiles and submit ad-hoc meter data requests Prudential System - Submit Prudential Support Information Capacity Auction – Submit Capacity Qualification and Demand Response Auction Offer Reliability Compliance Tool - Manage the process of collecting submittals from participants related to NERC reliability standards Enable Capacity Export – Give the market participant the ability to sell excess capacity to neighboring jurisdictions Online Settlement Forms - Collect market participant data required to settle the market Audit Revenue Metering Installation – Add, delete, or modify existing findings, actions, and finding classifications DR Metering Audit – Submit Demand Response metering audit Manage Contributor – Manage Demand Response Contributor Registry information Non-Compliance Report – Self-report possible breaches of the market rules CDM Plan and Measures - Used by LDCs and IESO to collaborate on changes to the LDC CDM Plans Retrofit - Manage Conservation Retrofit program and Restful API to interact with Retrofit program Industrial Energy Efficiency Program (IEEP) - Support customers across Ontario in improving their industrial processes and implementing system optimization projects Beacon – Manage the process with external suppliers related to FIT and microFIT contract management Transmission Rights Auction (TRA) – Manage auctions and allow market participants to submit bids in the TR market Market Power Mitigation (MPM) – Manage registered reference levels and reference quantities, and submit temporary reference level change requests
August 19, 2024
17:00 - 19:00 EST	Sandbox Online IESO	Due to planned outage Sandbox Online IESO will not be available. This includes the following actions: Registration Automation System – Manage organization registration and participant authorization, Facility registration and Meter Installation processes. Notice of Disagreement (NOD) – Manage the process with participants related to settlement and invoicing concerns. Meter Trouble Report (MTR) – Manages the process related to correcting revenue meter errors. Meter Data Management (MDM) – Manage meter data report profiles and submit ad-hoc meter data requests. Prudential System – Submit Prudential Support Information. Capacity Auction – Submit Capacity Qualification and Demand Response Auction Offer. Reliability Compliance Tool – Manage the process of collecting submittals from participants related to NERC reliability standards. Enable Capacity Export – Give the market participant the ability to sell excess capacity to neighboring jurisdictions. Online Settlement Forms – Collect market participant data required to settle the market. CDM Plan and Measures – Used by LDCs and IESO to collaborate on changes to the LDC CDM Plans. Retrofit – Manage Conservation Retrofit program and Restful API to interact with Retrofit program. Transmission Rights Auction (TRA) – Manage auctions and allow market participants to submit bids in the TR market. Market Power Mitigation (MPM) – Manage registered reference levels and reference quantities, and submit temporary reference level change requests
August 7, 2024
13:00 - 14:00 EST	IESO Reports Site	The Adequacy report will not be published.
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. Users may get disconnected and will need to login and verify access (MP action may be required).
13:00 - 13:10 EST	IESO Reports Site	The Predispatch report will not be published.
12:15 - 12:45 EST	IESO Reports Site	Confidential Report publication will be delayed. Public Report publication will be delayed.
July 31, 2024
10:25 - 11:10 EST	TRA	Transmission Rights Auction (TRA) will be unavailable
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 29, 2024
08:00 - 09:00 EST	Sandbox IESO Reports Site	Testing on the Sandbox Report site will be unavailable
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 25, 2024
19:30 - 22:00 EST	Sandbox Online IESO	Due to planned outage Sandbox Online IESO will not be available. This includes the following actions: Registration Automation System – Manage organization registration and participant authorization, Facility registration and Meter Installation processes. Notice of Disagreement (NOD) – Manage the process with participants related to settlement and invoicing concerns. Meter Trouble Report (MTR) – Manages the process related to correcting revenue meter errors. Meter Data Management (MDM) – Manage meter data report profiles and submit ad-hoc meter data requests. Prudential System – Submit Prudential Support Information. Capacity Auction – Submit Capacity Qualification and Demand Response Auction Offer. Reliability Compliance Tool – Manage the process of collecting submittals from participants related to NERC reliability standards. Enable Capacity Export – Give the market participant the ability to sell excess capacity to neighboring jurisdictions. Online Settlement Forms – Collect market participant data required to settle the market. CDM Plan and Measures – Used by LDCs and IESO to collaborate on changes to the LDC CDM Plans. Retrofit – Manage Conservation Retrofit program and Restful API to interact with Retrofit program. Transmission Rights Auction (TRA) – Manage auctions and allow market participants to submit bids in the TR market. Market Power Mitigation (MPM) – Manage registered reference levels and reference quantities, and submit temporary reference level change requests
July 23, 2024
14:15 - 14:40 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 22, 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
July 19, 2024
10:30 - 10:50 EST	IESO Reports Site	Confidential Report publication will be delayed. Public Report publication will be delayed.
July 12, 2024
00:01 - 17:00 EST	Sandbox System and Applications	Sandbox systems used for participant testing of IESO applications, including the IESO Sandbox Portal, Sandbox Reports Site, Sandbox EMI, and Sandbox Online IESO, will be unavailable.
July 11, 2024
20:00 - 23:59 EST	Sandbox System and Applications	Sandbox systems used for participant testing of IESO applications, including the IESO Sandbox Portal, Sandbox Reports Site, Sandbox EMI, and Sandbox Online IESO, will be unavailable.
July 5, 2024
11:00 - 12:00 EST	IESO Reports Site	The Adequacy report will not be published.
10:15 - 14:30 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
10:15 - 10:45 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. Users may get disconnected and will need to login and verify access (MP action may be required).
11:00 - 11:10 EST	IESO Reports Site	The Predispatch report will not be published.
10:15 - 10:45 EST	IESO Reports Site	Confidential Report publication will be delayed. Public Report publication will be delayed.
July 3, 2024
13:00 - 14:00 EST	IESO Reports Site	The Adequacy report will not be published.
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. Users may get disconnected and will need to login and verify access (MP action may be required).
13:00 - 13:10 EST	IESO Reports Site	The Predispatch report will not be published.
12:15 - 12:45 EST	IESO Reports Site	Confidential Report publication will be delayed. Public Report publication will be delayed.
June 25, 2024
08:00 - 10:00 EST	TRA	Transmission Rights Auction (TRA) will be unavailable
June 17, 2024
07:00 - 16:00 EST	Sandbox MIM	MRP Sandbox EMI application used to submit dispatch data will be unavailable. Market participants should confirm their dispatch data once the outage is completed.
June 14, 2024
17:00 - 23:59	Sandbox MIM	MRP Sandbox MIM Web Services and Sandbox MIM IDK used to submit dispatch data will be unavailable.MRP Sandbox EMI application used to submit dispatch data will be unavailable. Market participants should confirm their dispatch data once the outage is completed.
17:00 - 23:59	Sandbox Dispatch Service	MRP Sandbox automated dispatch instructions sent via sandbox Dispatch Service will be unavailable.MRP Sandbox EMI application used to submit dispatch data will be unavailable. Market participants should confirm their dispatch data once the outage is completed. Outage does not impact submission through API.
June 9, 2024
10:00 - 10:05 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).
13:00 - 13:05 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).
10:00 - 10:05 EST	EMI	Energy Market Interface (EMI) will be unavailable. EMI is the Web UI component of the Market Information Management (MIM) solution used to submit dispatch data. Users may get disconnected and will need to login and verify access eMIM API will be unavailable. eMIM is the MIM Application Programming Interface used to submit dispatch data. Users may get disconnected and will need to login and verify access.
13:00 - 13:05 EST	EMI	Energy Market Interface (EMI) will be unavailable. EMI is the Web UI component of the Market Information Management (MIM) solution used to submit dispatch data. Users may get disconnected and will need to login and verify access eMIM API will be unavailable. eMIM is the MIM Application Programming Interface used to submit dispatch data. Users may get disconnected and will need to login and verify access.
10:00 - 10:05 EST	Report Site	Report site will be unavailable and publication of public and confidential Reports will be delayed.
13:00 - 13:05 EST	Report Site	Report site will be unavailable and publication of public and confidential Reports will be delayed.
June 8, 2024
10:00 - 10:05 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).
13:00 - 13:05 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).
10:00 - 10:05 EST	EMI	Energy Market Interface (EMI) will be unavailable. EMI is the Web UI component of the Market Information Management (MIM) solution used to submit dispatch data. Users may get disconnected and will need to login and verify access eMIM API will be unavailable. eMIM is the MIM Application Programming Interface used to submit dispatch data. Users may get disconnected and will need to login and verify access.
13:00 - 13:05 EST	EMI	Energy Market Interface (EMI) will be unavailable. EMI is the Web UI component of the Market Information Management (MIM) solution used to submit dispatch data. Users may get disconnected and will need to login and verify access eMIM API will be unavailable. eMIM is the MIM Application Programming Interface used to submit dispatch data. Users may get disconnected and will need to login and verify access.
10:00 - 10:05 EST	Report Site	Report site will be unavailable and publication of public and confidential Reports will be delayed.
13:00 - 13:05 EST	Report Site	Report site will be unavailable and publication of public and confidential Reports will be delayed.
June 5, 2024
13:00 - 14:00 EST	IESO Reports Site	The Adequacy report will not be published.
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. Users may get disconnected and will need to login and verify access (MP action may be required).
13:00 - 13:10 EST	IESO Reports Site	The Predispatch report will not be published.
12:15 - 12:45 EST	IESO Reports Site	Confidential Report publication will be delayed. Public Report publication will be delayed.
May 31, 2024
08:05 - 08:07 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).
08:05 - 08:07 EST	EMI API	eMIM API will be unavailable. eMIM is the MIM Application Programming Interface used to submit dispatch data. Users may get disconnected and will need to login and verify access.
May 30, 2024
17:30 - 20:00 EST	Online IESO	Due to planned outage Online IESO will not be available. This includes the following applications: Registration Automation System – Manage organization registration and participant authorization, Facility registration and Meter Installation processes Notice of Disagreement (NOD) – Manage the process with participants related to settlement and invoicing concerns Meter Trouble Report (MTR) - Manage the process related to correcting revenue meter errors Meter Data Management (MDM) – Manage meter data report profiles and submit ad-hoc meter data requests Prudential System - Submit Prudential Support Information Capacity Auction – Submit Capacity Qualification and Demand Response Auction Offer Reliability Compliance Tool - Manage the process of collecting submittals from participants related to NERC reliability standards Enable Capacity Export – Give the market participant the ability to sell excess capacity to neighboring jurisdictions Online Settlement Forms - Collect market participant data required to settle the market Audit Revenue Metering Installation – Add, delete, or modify existing findings, actions, and finding classifications DR Metering Audit – Submit Demand Response metering audit Manage Contributor – Manage Demand Response Contributor Registry information Non-Compliance Report – Self-report possible breaches of the market rules CDM Plan and Measures - Used by LDCs and IESO to collaborate on changes to the LDC CDM Plans Retrofit - Manage Conservation Retrofit program and Restful API to interact with Retrofit program Industrial Energy Efficiency Program (IEEP) - Support customers across Ontario in improving their industrial processes and implementing system optimization projects Beacon – Manage the process with external suppliers related to FIT and microFIT contract management Transmission Rights Auction (TRA) – Manage auctions and allow market participants to submit bids in the TR market Market Power Mitigation (MPM) – Manage registered reference levels and reference quantities, and submit temporary reference level change requests
May 24, 2024
10:40 - 10:45 EST	IESO Workspaces	All workspaces will be unavailable during this period.
12:00 - 13:30 EST	IESO Workspaces	All workspaces will be unavailable during this period.
10:40 - 10:45 EST	ICCP	The Inter-Control Center Communication Protocol (ICCP) link to IESO will be unavailable.
10:40 - 10:45 EST	IESO Website	All workspaces will be unavailable during this period.
12:40 - 12:45 EST	IESO Website	All workspaces will be unavailable during this period.
10:20 - 10:25 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).
12:20 - 12:25 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).
10:20 - 10:25 EST	EMI	Energy Market Interface (EMI) will be unavailable. EMI is the Web UI component of the Market Information Management (MIM) solution used to submit dispatch data. Users may get disconnected and will need to login and verify access eMIM API will be unavailable. eMIM is the MIM Application Programming Interface used to submit dispatch data. Users may get disconnected and will need to login and verify access.
12:20 - 12:25 EST	EMI	Energy Market Interface (EMI) will be unavailable. EMI is the Web UI component of the Market Information Management (MIM) solution used to submit dispatch data. Users may get disconnected and will need to login and verify access eMIM API will be unavailable. eMIM is the MIM Application Programming Interface used to submit dispatch data. Users may get disconnected and will need to login and verify access.
12:20 - 12:25 EST	ICCP	The Inter-Control Center Communication Protocol (ICCP) link to IESO will be unavailable.
13:20 - 13:25 EST	IESO Website	All workspaces will be unavailable during this period.
12:20 - 12:25 EST	IESO Workspaces	All workspaces will be unavailable during this period.
10:20 - 10:25 EST	Report Site	Public Report publication will be delayed.
12:20 - 12:25 EST	Report Site	Public Report publication will be delayed.
13:20 - 13:25 EST	Report Site	Public Report publication will be delayed.
13:40 - 13:45 EST	Report Site	Public Report publication will be delayed.
May 16, 2024
10:00 - 12:00 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 15, 2024
12:15 - 13:00 EST	EMI	Energy Market Interface (EMI) will be unavailable. EMI is the Web UI component of the Market Information Management (MIM) solution used to submit dispatch data. Users may get disconnected and will need to login and verify access eMIM API will be unavailable. eMIM is the MIM Application Programming Interface used to submit dispatch data. Users may get disconnected and will need to login and verify access.
10:30 - 11:30 EST	Online IESO	Due to planned outages the following actions will not be available in Online IESO: Manage meter data report profiles and to submit ad-hoc meter data requests
13:00 - 13:30 EST	Online IESO	Due to planned outage Online IESO will not be available. This includes the following applications: Registration Automation System – Manage organization registration and participant authorization, Facility registration and Meter Installation processes Notice of Disagreement (NOD) – Manage the process with participants related to settlement and invoicing concerns Meter Trouble Report (MTR) - Manage the process related to correcting revenue meter errors Meter Data Management (MDM) – Manage meter data report profiles and submit ad-hoc meter data requests Prudential System - Submit Prudential Support Information Capacity Auction – Submit Capacity Qualification and Demand Response Auction Offer Reliability Compliance Tool - Manage the process of collecting submittals from participants related to NERC reliability standards Enable Capacity Export – Give the market participant the ability to sell excess capacity to neighboring jurisdictions Online Settlement Forms - Collect market participant data required to settle the market Audit Revenue Metering Installation – Add, delete, or modify existing findings, actions, and finding classifications DR Metering Audit – Submit Demand Response metering audit Manage Contributor – Manage Demand Response Contributor Registry information Non-Compliance Report – Self-report possible breaches of the market rules CDM Plan and Measures - Used by LDCs and IESO to collaborate on changes to the LDC CDM Plans Retrofit - Manage Conservation Retrofit program and Restful API to interact with Retrofit program Industrial Energy Efficiency Program (IEEP) - Support customers across Ontario in improving their industrial processes and implementing system optimization projects Beacon – Manage the process with external suppliers related to FIT and microFIT contract management Transmission Rights Auction (TRA) – Manage auctions and allow market participants to submit bids in the TR market Market Power Mitigation (MPM) – Manage registered reference levels and reference quantities, and submit temporary reference level change requests
09:30 - 10:00 EST 13:00 - 13:30 EST	TRA	Transmission Rights Auction (TRA) will be unavailable
14:00 - 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. Users may get disconnected and will need to login and verify access (MP action may be required).
May 9, 2024
8:00 - 10:30 EST	Sandbox Transmission Rights Auction	Transmission Rights Auction (TRA) application cannot be tested on Sandbox.
13:00 - 14:00 EST	IESO Reports Site	The Adequacy report will not be published.
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. Users may get disconnected and will need to login and verify access (MP action may be required).
13:00 - 13:10 EST	IESO Reports Site	The Predispatch report will not be published.
12:15 - 12:45 EST	IESO Reports Site	Confidential Report publication will be delayed. Public Report publication will be delayed.
November 29, 2023
10:00 - 10:30 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).
10:00 - 10:30 EST	IESO Reports Site	Confidential Report publication will be delayed. Public Report publication will be delayed.
November 28, 2023
14:15 - 14:15 EST	EMI	Energy Market Interface (EMI) will be unavailable. EMI is the Web UI component of the Market Information Management (MIM) solution used to submit dispatch data. Users may get disconnected and will need to login and verify access eMIM API will be unavailable. eMIM is the MIM Application Programming Interface used to submit dispatch data. Users may get disconnected and will need to login and verify access.

Planned IT Outages

Planned Outages for 18 Oct 2025

Future Outages

Past Outages