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​For more information on this stakeholder initiative, email Stakeholder Engagement.

Market Information Management Business Scenario (SE-74)

​Market participants in the Ontario energy market use the Market Participant Interface (MPI) to submit bids and offers, to receive market notices sent by system operators, and enter schedules and physical bilateral contracts. It is the main graphical interface for participants to operate in the IESO administered markets.

This user interface has remained essentially unchanged since the market began operation in 2002 and the IESO is in the planning stages to replace the existing MPI Workspace. The new system will be known as the Market Transaction Interface (MTI).

A main driver for the change is that the existing hardware and software components are nearing end of life and there is a need to bring the system in line with current IESO architectural standards. In making this change, we can address known problems and improve functionality identified by stakeholders through this stakeholder engagement initiative.

This initiative will be of interest to all transactional market participants who submit bids and offers, receive Market Notices, and enter schedules and physical bilateral contracts.

Stakeholder Engagement Plan
Stakeholder Engagement Plan (Revised, December 17, 2008)
Stakeholder Engagement Plan (Revised, March 4, 2009)
Stakeholder Engagement Plan (Revised, June 23, 2009)

Schedule of Activities


Supporting Material

Expected Actions


​This stakeholder engagement initiative is closed.  The IESO has pursued this matter with stakeholders under a new stakeholder engagement initiative. 

Please refer to the MPI/API Replacement Working Group

On hold

Stakeholder the MTI UI design

Dialogue - Stakeholder input

On hold

Stakeholder the MTI API message structure

Dialogue - Stakeholder input

June 23, 2009

Business Scenario

June 2, 2009

Update on initiative provided at June 2 Dispatchable Load Working Group meeting

March 10, 2009

Presentation to IT Standing Committee Meeting

Dialogue - Stakeholders to provide input

February 26, 2009

Communication to Participants on Survey Results

IESO to communicate survey results

February 26, 2009

Publish summary of feedback

Stakeholder Feedback

Dialogue - IESO to publish feedback

January 9, 2009

Deadline for completion of the survey

Dialogue - IESO to publish feedback

January 8, 2009

Deadline for written input from stakeholders on the stakeholder engagement plan

Stakeholder Feedback           

IESO to publish revised stakeholder engagement plan

January 2009

Individual face-to-face meetings with stakeholders requesting a meeting

Deliberation - Stakeholder input

December 17, 2008

Send out survey to market participants to gather feedback to identify problems and opportunities

Dialogue - Stakeholder input

December 11, 2008

Publish and communicate stakeholder engagement plan

Stakeholders to provide written feedback