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

Registration

Registration for the LLT(e) RFP and LLT(c) RFP is now open and will close on October 6, 2026 at 3:00 EPT.

Registration information and instructions can be found in Section 3.4 of both the LLT(e) RFP and LLT(c) RFP. As a reminder, the IESO will respond to all Proponents who have submitted registration materials to notify them of their registration status well in advance of the LLT(e) RFP and LLT(c) RFP Proposal Submission Deadline.

For an overview of the LLT Registration process, along with helpful reminders, please refer to the LLT Registration – Process Overview & Best Practices document, which is posted in the LLT General Procurement Documents section below.

All Proponents are reminded that the communications provisions set out in Section 3.5 of the LLT RFPs are in effect until the conclusion of the LLT(e) RFP and LLT(c) RFP processes, respectively.

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.

Please note that the deadline for pre-deliverability test intake has now passed. Any forms submitted after September 9, 2026, will not be processed.

Prospective Proponents can continue to 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 Procurement Documents

Updates and Clarifications

September 11, 2026

Minor updates have been made to the following Prescribed Form:

  • Economic Bid Statement: LLT(c) PF-EB100 (v2)
    • Spacing adjustments were made for formatting purposes only.

August 12, 2026

Minor updates have been made to the following two Prescribed Forms:

  • Proposal Workbook: LLT(c) PF-PW100 (v2)
    • Item 65 drop down selections have been updated to better align with the census division selected in Item 64
  • Proposal Workbook: LLT(e) PF-PW100 (v2)
    • Item 64 drop down selections have been updated to better align with the census division selected in Item 63
LLT RFP - General Documents

LLT RFP Questions and Responses

LLT RFP Deliverability

Provincial Crown Land Project Resources

Agricultural Impact Assessment (AIA) Resources

Crown Land Project Resources

LLT RFP - Additional Resources

LLT(c) RFP – Capacity Documents

Final LLT(c) RFP Documents

  1. LLT(c) RFP – Addendum No. 1 (August 12, 2026)
  2. LLT(c) RFP – Consolidated with Addendum No. 1 (August 12, 2026)
  3. LLT(c) RFP Consolidated - Blacklined to May 6, 2026 (August 12, 2026)
  4. LLT(c) Contract – Consolidated with Addendum No. 1 (August 12, 2026)
  5. LLT(c) Contract Consolidated – Blacklined to May 6, 2026 (August 12, 2026)
  6. LLT(c) RFP (May 6, 2026)
  7. LLT(c) RFP – Blacklined to April 1, 2026 (May 6, 2026)
  8. LLT(c) Contract (May 6, 2026)
  9. 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 (V2) (September 11, 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 (v2) (August 12, 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 - Addendum  No. 1 (August 12, 2026)
  2. LLT(e) RFP – Consolidated with Addendum No. 1 (August 12, 2026)
  3. LLT(e) RFP Consolidated – Blacklined to May 6, 2026 (August 12, 2026)
  4. LLT(e) Contract – Consolidated with Addendum No. 1 (August 12, 2026)
  5. LLT(e) Contract Consolidated– Blacklined to May 6, 2026 (August 12, 2026)
  6. LLT(e) RFP (May 6, 2026)
  7. LLT(e) RFP – Blacklined to April 1, 2026 (May 6, 2026)
  8. LLT(e) Contract (May 6, 2026)
  9. 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 (v2) (August 12, 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