IT Release Schedule

Details of proposed changes to IESO systems and reports being revised for the current release are available here. Each release includes a preliminary, target and final planposted according to the IT Release Schedule. A yellow box indicates that the plan is not published for this release.

Target Release Plan

Final Release Plan

Release ID

Release R50.1 R51.0 R51.1 R52.0 R52.1
Release Category Category 2 Category 3
(incl.Cat 2)
Category 2 Category 3
(incl.Cat 2)
Category 2
Real Time Production Build 6 Dec 2023 6 Mar 2024 5 Jun 2024 11 Sep 2024 4 Dec 2024
1. Preliminary Release Plan
Prepared
23 Aug 2023 22 Nov 2023 21 Feb 2024 29 May 2024 21 Aug 2024
2. Market Participant Feedback
Period Ends
6 Sep 2023 6 Dec 2023 6 Mar 2024 12 Jun 2024 4 Sep 2024
3. Target Release Plan 20 Sep 2023 20 Dec 2023 20 Mar 2024 26 Jun 2024 18 Sep 2024
4. Final Release Plan 18 Oct 2023 17 Jan 2024 17 Apr 2024 24 Jul 2024 16 Oct 2024
5. Sandbox Implementation 26 Aug 2023 25 Jan 2024 25 Apr 2024 1 Aug 2024 24 Oct 2024
6(a). Production Build
(Non Real Time)
29 Nov 2023 28 Feb 2024 29 May 2024 4 Sep 2024 27 Nov 2024
6(b). Production Build
(Real Time)
6 Dec 2023 6 Mar 2024 5 Jun 2024 11 Sep 2024 4 Dec 2024

Four times per year, the IESO schedules a Preliminary Release Plan detailing upcoming changes to IESO systems that have been assessed to have an impact on participants. Comments on IT changes in the plan can be sent to pending.changes@ieso.ca. Each release includes a preliminary, target and final plan, categorized as the following:

  • Category 3 releases (occurring twice a year) require market participants to make changes to their own technical interfaces with the IESO. Normally, significant system changes are the subject of stakeholder consultation well in advance of this release process.
  • Category 2 releases (occurring four times a year) require market participants to make a change in procedure or to update documentation, but not to modify any IT systems.
  • Category 1 releases do not have any impact on market participants and are managed through the IESO's internal release process. Market participants are notified only of any applicable outages, via the Planned IT Outages webpage.

Updates to the Preliminary Plan are added to the Target Release Plan, which is also open for comment by participants. New items are added to the Target Release Plan if required, and are posted through the IT Release Schedule.

The Final Release Plan is published one week in advance of the Sandbox implementation date, when changes are made available in the Sandbox environment for testing and training. Participants can contact IESO Customer Relations for more information if Sandbox access is required.

After the testing period is complete, the IESO will release the changes in Production, as shown on the IT Release Schedule. Accompanying documentation for the changes is available on Pending Changes – Documents as part of the baseline process.