2027 Baseline Schedule for IESO Document Changes Now Available
October 23, 2026
The 2027 Baseline Schedule for the publication of new and revised IESO technical interface documents, market manuals and baseline plans is available on the Baseline Schedule web page.
The baseline is a formal process to revise market manuals and related documents that result from recently approved market rule amendments, revised procedures, or technical system changes. Market Participants are advised to review the schedule to ensure they are aware of document change timelines.