Capacity Auction

Capacity auctions are an effective tool to help meet Ontario’s reliability needs and enable broader participation in the electricity market. Aligned with our commitment to increase competition, the IESO is proposing to adopt a phased approach to evolve the Capacity Auction (CA) while taking into consideration the unique nature of Ontario’s electricity system.

The IESO will engage stakeholders to improve design features that support sector participation, reliability, and affordability for consumers for incorporation into future auctions. This engagement builds on the stakeholder discussion regarding “Meeting Ontario’s Capacity Needs.”

The IESO is committed to working with stakeholders to explore and implement competitive mechanisms, such as auctions, to secure the products and services it requires to operate the grid reliably and efficiently now and into the future.

As part of this process, feedback is being requested from stakeholders on specific aspects of the ongoing evolution of the CA. This engagement plan outlines the objectives, approach, timeline and considerations for engaging stakeholders in that process. This engagement plan may be subject to review and updates, as the project continues. All comments and inquiries on this engagement can be directed to


Schedule of Activities



Expected Actions

January 23, 2020


Engagement Meeting      

To register for the webinar click here.


December 20, 2019            

Stakeholder feedback due on draft market rules and market manuals for June 2020 auction and on design proposals for December 2020 auction 


December 6, 2019


Meeting Minutes


Meeting to present the final June 2020 design document and draft market rules and manuals         

Meeting Materials

June 2020 Design Document – revised

Draft Market Rules – June 2020 Capacity Auction

Draft Market Manuals – June 2020 Capacity Auction


November 15, 2019

Stakeholder feedback due on draft design document


October 25, 2019



Meeting to review feedback on design proposals and present draft design document for June 2020 auction


October 18, 2019

June 2020 Capacity Auction Draft Design


October 7, 2019

Stakeholder feedback due on draft design proposals for June 2020 auction


September 20, 2019



Meeting to begin discussion on June 2020 auction design

  • Review initial feedback on scope of the work plan
  • Discuss initial set of design proposals for June 2020 auction, including design proposals specific to auction mechanics (reference price and maximum auction clearing price)
  • Communication
  • Presentation

September 5, 2019

Stakeholder feedback due on draft engagement plan, and high-level scope


August 22, 2019


Introductory discussion and presentation of the purpose, high-level scope, and timing of this engagement