Baseline Schedule

Details of all of the documents being revised for the current Baseline (and the next Baseline if available) can be found below.

See Document Library for previous Baseline Plans.

Milestones

Baseline 54.1 Baseline 55.0 Baseline 55.1 Baseline 56.0 Baseline 56.1
Technical Interface Documents
All technical interface documents relating to the upcoming IT Release Schedule are posted on the Pending Changes – Documents page for Market Participant comment. The IESO will post technical documents as they are made available and may not occur on the proposed date indicated. Documents may be deferred to the Market Facing document posting date. Refer to the IT Release Schedule for specific dates.

Sep 22, 2025

Dec 22, 2025

Mar 18, 2026

Jun 24, 2026

Sep 16, 2026

Baseline Plan
The baseline plan provides details of all document revisions, including stakeholder history and impact of change. It is made available as documents are identified for baseline inclusion. Documents submitted after impact assessment date will added to the plan under the heading “Update to Baseline”.

Oct 14, 2025

Jan 12, 2026

Apr 7, 2026

Jul 6, 2026

Oct 13, 2026

Market Facing Documents
New and revised market manuals and related documents are posted on the Pending Changes – Documents page. IESO initiates impact assessment, inviting market participants to review updated documents and provide feedback regarding document revisions.

Oct 15, 2025

Jan 14, 2026

Apr 8, 2026

Jul 8, 2026

Oct 14, 2026

Final Publishing of Documents
Final approved documents published on the IESO website.

Dec 3, 2025

Mar 4, 2026

Jun 3, 2026

Sep 9, 2026

Dec 2, 2026