Long Lead-Time RFP

Ontario’s electricity sector continues to see a growing demand into the 2030s and beyond due to increasing industrial demand, data center growth and electrification. To meet these needs while maintaining flexibility, the IESO has taken a multi-pronged approach to secure energy and capacity resources under various term lengths, including the Long-Term 2 RFPs and Medium-Term RFPs.

Alongside other ongoing procurement initiatives, the Long Lead-Time Request for Proposals (LLT RFP) is intended for resources with unique development considerations that require more than five years for project development. Eligible resources include hydroelectric and certain long-duration energy storage technologies. Successful projects will be offered a 40-year contract, aligned with expected resource lifetimes.

LLT RFP Updates

Final documents for both the Long Lead-Time Energy Supply Request for Proposals (LLT(e) RFP) and the Long Lead-Time Capacity Services Request for Proposals (LLT(c) RFP) are posted below and both competitive procurement processes are now active.

All Proponents are reminded that the communications provisions set out in Section 3.5 of the LLT RFPs are now in effect until the conclusion of the LLT(e) RFP and LLT(c) RFP processes, respectively, including, without limitation, restrictions on communications in respect of Excluded Purposes. Failure to comply with these requirements could result in disqualification of a Proponent or revocation of a Proponent’s status under either of the LLT RFPs.

An update was made to the following two Prescribed Forms: 

  1. Evidence of Municipal Support: LLT(c) PF-MS100(v2) (May 6, 2026)
  2. Evidence of Municipal Support: LLT(e) PF-MS100(v2) (May 6, 2026)

The update has been made to the Instructions section, Guidance for Municipalities section and Sections 1-3 of the Prescribed Form. Please note that this change has no impact to the form of resolution itself. Submitting the version of the form posted on February 27, 2026, will not, on its own, invalidate the resolution or be evaluated as failure to meet the requirements of Sec 4.2(a). as applicable of the final LLT(c) RFP or LLT(e) RFP.

For further information about upcoming engagement sessions, please visit the IESO’s Long Lead-Time RFP Stakeholder Engagement web page.

Any general enquiries regarding the LLT RFP can be sent to LLT.RFP@ieso.ca.

LLT RFP Schedule

Activity LLT(c) LLT(e)
Final Documents released / Questions and Comments period opens
 May 6, 2026
 May 6, 2026
Deadline for Questions and Comments
 July 10, 2026
 July 10, 2026
IESO’s deadline for issuing Addenda
 August 13, 2026
 August 13, 2026
Registration Start Date
 September 23, 2026
 September 23, 2026
Registration Deadline
 October 6, 2026, at 3:00 p.m. EPT
 October 6, 2026, at 3:00 p.m. EPT
Proposal Submission Deadline
 November 26, 2026, at 3:00 p.m. EPT
 November 26, 2026, at 3:00 p.m. EPT
Target date to notify Selected Proponents
 May 25, 2027
 May 25, 2027

Note: dates are subject to change.

The Pre-deliverability Test Intake Form is now available. To request a Pre-deliverability Test, complete the applicable form found within the accordion folders for each procurement stream and follow the submission instructions included in the form. Prospective Proponents seeking pre-deliverability information are required to submit forms according to the following deadlines:

  • Deadline #1 - April 28, 2026 (CLOSED)
  • Deadline #2 - June 30, 2026
  • Deadline #3 - September 9, 2026

*dates are subject to change based on final procurement timelines

 

Prospective Proponents can now schedule Deliverability Consultations. Interested parties can schedule a meeting directly with the IESO. Please provide a list of questions when booking your consultation. To share further documentation or ask questions about the consultation booking, email engagement@ieso.ca. Deliverability consultations will be offered until two weeks prior to the Proposal Submission Deadline.

Engaging Stakeholders

Learn more about the engagement plan, objectives, approach, timeline and considerations for engaging stakeholders.

Subscribe for Updates

Visit the IESO's subscribe page to sign up for future Long Lead-Time RFP updates.

LLT RFP - General Documents

LLT RFP Deliverability

Provincial Crown Land Project Resources

Agricultural Impact Assessment (AIA) Resources

Crown Land Project Resources

LLT RFP General Documents

LLT(c) RFP – Capacity Documents

Final LLT(c) RFP Documents

  1. LLT(c) RFP (May 6, 2026)
  2. LLT(c) RFP – Blacklined to April 1, 2026 (May 6, 2026)
  3. LLT(c) Contract (May 6, 2026)
  4. LLT(c) Contract – Blacklined to April 1, 2026 (May 6, 2026)

Final LLT(c) RFP Prescribed Forms

  1. Registration Form: LLT(c) PF-REG100 (May 6, 2026)
  2. Registration Workbook: LLT(c) PF-RW100 (May 6, 2026)
  3. Access Rights Declaration: LLT(c) PF-AR100 (May 6, 2026)
  4. Class II LDES Independent Engineer Certificate: LLT(c) PF-IE100 (May 6, 2026)
  5. Confirmation of Unincorporated Territory: LLT(c) PF-CUT100 (May 6, 2026)
  6. Economic Bid Statement: LLT(c) PF-EB100 (May 6, 2026)
  7. Evidence of Indigenous Community Participation: LLT(c) PF-IP100 (May 6, 2026)
  8. Evidence of Indigenous Support: LLT(c) PF-IS100 (May 6, 2026)
  9. Evidence of Municipal Support: LLT(c) PF-MS100(v2) (May 6, 2026)
  10. Notice of Proposal Withdrawal: LLT(c) PF-NW100 (May 6, 2026)
  11. Proponent Information, Declaration and Workbook: LLT(c) PF-PI100 (May 6, 2026)
  12. Proposal Workbook: LLT(c) PF-PW100 (May 6, 2026)
  13. Supply Chain Disclosure Plan: LLT(c) PF-DP100 (May 6, 2026)

LLT(c) RFP Pre-deliverability Test

LLT(e) RFP – Energy Documents

Final LLT(e) RFP Documents

  1. LLT(e) RFP (May 6, 2026)
  2. LLT(e) RFP – Blacklined to April 1, 2026 (May 6, 2026)
  3. LLT(e) Contract (May 6, 2026)
  4. LLT(e) Contract – Blacklined to April 1, 2026 (May 6, 2026)

Final LLT(e) RFP Prescribed Forms

  1. Registration Form: LLT(e) PF-REG100 (May 6, 2026)
  2. Registration Workbook: LLT(e) PF-RW100 (May 6, 2026)
  3. Access Rights Declaration: LLT(e) PF-AR100 (May 6, 2026)
  4. Confirmation of Unincorporated Territory: LLT(e) PF-CUT100 (May 6, 2026)
  5. Economic Bid Statement: LLT(e) PF-EB100 (May 6, 2026)
  6. Evidence of Indigenous Community Participation: LLT(e) PF-IP100 (May 6, 2026)
  7. Evidence of Indigenous Support: LLT(e) PF-IS100 (May 6, 2026)
  8. Evidence of Municipal Support: LLT(e) PF-MS100(v2) (May 6, 2026)
  9. Notice of Proposal Withdrawal: LLT(e) PF-NW100 (May 6, 2026)
  10. Proponent Information, Declaration and Workbook: LLT(e) PF-PI100 (May 6, 2026)
  11. Proposal Workbook: LLT(e) PF-PW100 (May 6, 2026)
  12. Supply Chain Disclosure Plan: LLT(e) PF-DP100 (May 6, 2026)

Other LLT(e) RFP Documents

LLT(e) RFP Pre-deliverability Test

Disclaimer

The Long Lead-Time Request for Proposals (“LLT RFP”) and the statements and information contained therein, are based on the proposed design as of the date of posting and remain subject to amendment following the process set out in the LLT RFP. Nothing in the LLT RFP, or the posting thereof, obligates the IESO to continue or conduct the procurement process contemplated herein, or any other procurement process. Nothing in the posted LLT RFP or contract 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 the LLT RFP or LLT contract, and the IESO market rules, any legislation or regulation, the terms in the market rules, legislation, or regulation as applicable, govern.

LLT RFP Archived Documents

LLT(c) RFP - Long Lead-Time – Capacity

LLT(e) RFP – Long Lead-Time – Energy