Medium-Term RFP

After more than a decade of strong supply, Ontario is entering a period of emerging electricity system needs which begin mid-decade. To address these needs, the IESO is competitively securing up to 750 MW of capacity through this Medium-Term RFP.

In order to address needs in a timely, cost-effective and flexible manner, the IESO developed a Resource Adequacy Framework that sets out how to secure capacity and energy through a variety of competitive processes and timeframes – focusing on meeting reliability needs cost-effectively. This approach also more effectively balances ratepayer and supplier risk.

The 2021 Annual Acquisition Report describes these mechanisms and needs in more detail – including this Medium-Term RFP, that seeks to secure capacity from existing electricity generation or storage resources for a three-year commitment period starting May 1, 2026 with an optional two-year extension period.

This Medium-Term RFP represents another step in the IESO’s transition to acquire resources based on their ability to offer services such as capacity, energy and the ability to ramp up and down quickly and not by fuel type.

For this initial procurement, existing resources are best positioned to cost-effectively meet capacity needs emerging mid-decade. It will be followed by other procurements - including a long-term RFP to secure new resources and other cadenced Medium-Term RFPs in the future.

Future Medium-Term RFPs will evolve based system needs and will see increased resource eligibility and competition. Procurement design and requirements have been and will continue to be shaped by input from stakeholders through the Resource Adequacy Engagement, as well as other IESO assessments and engagements.

Visit the IESO's Subscribe page to sign up for future Medium-Term RFP updates.

Registration for the Medium-Term RFP will open in February 2022. Please contact with any questions regarding the Medium-Term RFP.


This draft request for proposals (“RFP”) and the statements and information contained herein are provided for information and discussion purposes only. This draft RFP is based on the proposed design as of the date of posting and remains subject to change. Nothing in this draft RFP or the posting of this draft RFP obligates the IESO to commence, continue, or conduct the procurement process contemplated herein or any other procurement process. Nothing in this draft RFP or the posting of this draft RFP constitutes, nor shall it be construed to constitute, an agreement, guarantee, representation, or warranty, express or implied, on behalf of the IESO. The IESO provides no such agreement, guarantee, representation, or warranty and disclaims any and all liability associated therewith. In the event there is any conflict or inconsistency between this draft RFP and the IESO market rules, any IESO contract, any legislation or regulation, or any final RFP or other procurement document, the terms in the market rules, or the subject contract, legislation, regulation, RFP, or procurement document, as applicable, govern.

Schedule of Procurement Activities 

The dates provided below are aligned with the draft Medium-Term RFP and are subject to change.

Date Procurement Activities

November 2, 2021

Draft Medium-Term RFP posted

November 16, 2021

Webinar to walk through and engage on the details of the draft Medium-Term RFP


Recorded Presentation

November 25, 2021

Webinar to walk through and engage on the details of the draft Medium-Term Capacity Contract


December 10, 2021

Deadline for questions and comments on the draft Medium-Term RFP and draft Medium-Term Capacity Contract to be sent to the IESO. 

January 31, 2022

IESO's deadline for releasing Medium-Term RFP and Medium-Term Capacity Contract

February 14, 2022

Proponent's deadline for submitting questions and comments, if any

February 21, 2022

Proponent's deadline for Registration

March 14, 2022

IESO's deadline for responding to the Proponents confirming their status as a Qualified Applicant and their respective Monthly Qualified Capacity

April 21, 2022

IESO's deadline for issuing Addenda to Medium-Term RFP and Medium-Term Capacity Contract, if any

April 28, 2022

Proposal submission deadline