Formalizing the Integrated Bulk System Planning Process

The IESO plans for the resources needed to meet Ontario’s future electricity needs. This includes accounting for Ontario’s forecasted electricity requirements, and carrying out integrated resource planning for energy efficiency, generation and transmission infrastructure to meet those requirements. With the resource adequacy engagement underway to develop a robust framework of competitive mechanisms to meet Ontario’s resource adequacy needs in the short, medium and long term periods, the processes to guide planning for the bulk power system must also evolve to coordinate with these changes.

The IESO will be seeking feedback from communities and stakeholders on the design of a formal integrated bulk system planning process, including:

  • How bulk system planning should to evolve to respond to changes in electricity planning and markets
  • How and where engagement should occur in developing bulk system plans
  • How changes to the bulk planning process may affect communities and stakeholders

Additional details on the IESO’s plans to engage stakeholders throughout the process can be found in the engagement plan. All comments and enquiries on this engagement can be directed to

Documents referenced on this page, but not posted, can be obtained by contacting with a link to the web page that lists the document and advise whether it needs to be provided in an accessible format. Please allow a minimum of one business day for a response.

Schedule of Activities

Date Activities



Transition to the Bulk System Planning Process

Discussion on proposed enhancements and how recommended changes may affect communities and stakeholders

Q3-Q4, 2021

Second engagement on the final high-level design and the process detail for stakeholder engagement

March 15, 2021

Stakeholder feedback due on materials presented at the February 22nd webinar

May 5, 2021: IESO Response to Stakeholder Feedback

February 22, 2021


High-level Design and Development of the Bulk System Planning Process

IESO to present an overview of the high level design of proposed changes to bulk system planning and seek stakeholder feedback on the process.

Recorded Presentation

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

November 18, 2020

Overview of proposed Bulk System Planning Process presented in Planning and Overview webinar at the November Engagement Days

February, 2020

Update on Bulk System Planning Process presented at Technical Planning Conference

March 19, 2019

Stakeholder Feedback

  • TransAlta

February 26, 2019

Bulk System Planning Webinar #2

Recorded Presentation

  • Presentation
  • Feedback Form

December 14, 2018

Stakeholder Feedback


  • David Suzuki Foundation
  • Jon Cloud
  • TransAlta
  • IESO Response to Feedback

November 23, 2018

Phase 1 Bulk Planning Webinar

November 7-8 & 21-22, 2018

Regional Energy Forums

October 22-24, 2018

First Nations Energy Symposium

September 13, 2018

IESO Technical Planning Conference