Market Participant Readiness

API Technical Specifications for Dispatch Services and MIM

As part of the Market Renewal Program (MRP), changes are being made to the way Market Participants will interact with the Market Information Management and the Dispatch Services systems. These applications are currently used by dispatchable Market Participants to submit bids and offers for the physical market and to receive dispatch instructions from the IESO. To prepare Market Participants, the IESO has provided an updated set of API technical specifications, schema and sample files in the section below. Further details on the updated materials are noted in the Participant Readiness Memo.

Market Information Management System

• XSD

• WSDL

• MIM Web Services Toolkit (TBD)

• MIM Sample Request and Response Files

Dispatch Service System

• Dispatch Service Web Service Design Specifications (SPEC-154)

• Dispatch Notification Service Web Service Design Specifications (SPEC-155)

IESO Reports Impacted by MRP

The changes to come from the Market Renewal Program (MRP) will introduce new reports and update existing reports to reflect the renewed market. These changes will apply to both public and confidential reports. To assist market participants in preparing for these changes, the IESO is publishing the schema, sample and help files for the new and revised IESO reports. Market participants are recommended to verify that they can view and download these reports, and confirm that the structural changes in these files can be accepted by their internal processes and systems before MRP Go-Live. The table below provides a summary of estimated timelines for publishing the various grouping of reports.

Target Sample File and Schema Posting Timelines**

**Table last updated September 2023, timelines subject to change