Skip Links
Sector Participants > Change Management > Pending Changes - Documents

Pending Changes - Documents

The list below provides advance notice of pending changes to the market rules, market manuals, technical interfaces documentation or other items that define the operation of the IESO-administered market. For changes that are minor, the listing will identify the document that is changing and a description of the revisions, but a link to the altered document may not be included.

Comments on the design and implementation concerns can be sent to This feedback will be taken into account during the 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.

Pending Changes - Documents

Item Last Updated Comments Due Target Implementation
IMDC: Format Specifications for Settlement Statement Files and Data Files, IMDC-85

Updated location ID number.

The change that needs to be made is only for CT404 in Appendix A.1.1. Column 8 has been updated to include “0”, column 28 to include “Fixed Payment Amount”, column 29 to include “Variable Payment Amount” and column 30 to include “MMO Payment Amount”.

13-Feb-2024 20-Feb-2024 February 21, 2024
MM5.7: Settlement Process, MDP_PRO_0046_v19.2

v19.2: Clarification in section 1.3.3 and added information to section 1.3.4.

v19.1: Revised links and clarifications.
22-Jan-2024 05-Feb-2024 Baseline 51.0
Guide to Settlement Claims and Data Submissions via Online IESO, GDE-476_v5.1

Addition of OPG Hydroelectric Prescribed Assets Measurement form and Submission Window Edits.
12-Jan-2024 26-Jan-2024 Baseline 51.0
MM5.5: Physical Markets Settlement Amounts, MDP_PRO_0033_v91.1

Edits made to reference Ontario Regulation 53/05, Payments Under Section 78.1 of the Electricity Restructuring Act 2004 (“O. Reg. 53/05”), for list of OPG’s regulated assets.
12-Jan-2024 26-Jan-2024 Baseline 51.0
MM5.8: Settlement Invoicing, MDP_PRO_0047_v5.8

Section 1.3.2 - Hyperlink to sample settlement invoice added, Appendix B - Hyperlink to sample physical markets settlement invoice added.
12-Jan-2024 26-Jan-2024 Baseline 51.0
Market Manual 6: Participant Technical Reference Manual, IMO_MAN_0024_v39.1

The hyperlink in Section 3.1.2 for the Dispatch Service Client User Guide was updated.
10-Jan-2024 26-Jan-2024 Baseline 51.0
Market Manual 4.6: Real-Time Generation Cost Guarantee Program, PRO-324_v12.1

Removed the pre-2024 Compressor Fuel Volume Adder and Service Price Adder values in section 5.4.1.
10-Jan-2024 26-Jan-2024 Baseline 51.0
Format Specifications for Settlement Statement Files and Data Files, IMP_SPEC_0005_v58.1

Updated to describe changes for ct133 output on statements.  Also, updated uplift output on statements to reflect the most up-to-date representation.
30-Nov-2023 26-Jan-2024 Baseline 51.0