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Cost Recovery for Integrating System Changes


To support proponents seeking to make changes to Ontario’s electricity system, the IESO performs two broad types of activities to ensure the operability and reliability of the IESO-controlled grid.  The first type is related to assessing the potential impact a new or modified facility may have on the system through conducting System Impact Assessments and Technical Feasibility Studies. The IESO currently charges proponents the costs to perform these studies. The second type of activities are those related to ensuring facilities meet prescribed requirements and then updating the IESO’s systems, processes and procedures to reliably integrate those new or modified facilities when they come into service.  The costs associated with these activities are currently recovered from all loads in the province on a volumetric basis through the IESO’s usage fees.  The IESO intends to begin charging these costs to the proponent initiating the change.  Since this initiative will result in a change to an IESO administered fee, OEB approval will be required prior to implementation.  

The IESO will seek stakeholder input on the method to be used to apply these charges for various types of activities, invoicing timing, the phase-in strategy, and to obtain feedback on whether any special considerations exist that should be taken in to account.

The IESO encourages stakeholders particularly generators, transmitters, distributors, wholesale consumers, and ancillary service providers to stay informed and participate in this engagement. To be added to the email list for communications related to this engagement or to submit comments and enquiries, please email

Related Information

Draft Engagement Plan

Schedule of Activities

Anticipated timing for this engagement is presented below.

Date Engagement Activity Expected Actions

January 2024

Final Engagement Summary


August 12, 2021

Deadline for stakeholder feedback on materials presented at the July 22nd webinar.

September 30, 2021: IESO Response to Stakeholder Feedback


July 22, 2021

The IESO will introduce the engagement, provide background information as well as the approach forward.

Recorded Presentation

This webinar was presented during the IESO's July stakeholder engagement sessions, see full agenda for more information.

June 30, 2021

Cost Recovery for Integrating System Changes engagement launched.