Regional Electricity Planning - GTA East

Forecasting and Planning

The recent cycle of regional planning for the GTA East electrical region was completed in October 2026. This engagement initiative provided Indigenous communities, municipalities, customers and interested parties with an opportunity to offer input for consideration into the development of the 2026 GTA East Integrated Regional Resource Plan (IRRP).

All comments and enquiries in this engagement initiative can be directed to engagement@ieso.ca.

Also see the regional planning webpage for GTA East

Related Information

2026 GTA East Integrated Regional Resource Plan (IRRP)

2026 GTA East IRRP Appendices

2026 GTA East IRRP Fact Sheet

2025 GTA East Scoping Assessment Outcome Report

2024 GTA East Needs Assessment

2022 Gatineau Corridor End-of-Life Study

2016 Pickering-Ajax-Whitby Integrated Regional Resource Plan (IRRP)

2016 Pickering-Ajax-Whitby IRRP Appendices

Pickering-Ajax-Whitby IRRP Terms of Reference

2014 GTA East Scoping Assessment Outcome Report

Hydro One GTA East Regional Planning website

2026 IRRP Engagement Activities

Date	Materials	Expected Actions
October 26, 2026	GTA East Electricity Plan posted 2026 GTA East Integrated Regional Resource Plan (IRRP) 2026 GTA East IRRP Appendices 2026 GTA East IRRP Fact Sheet Data Tables IESO Response to Feedback to Public Engagement Webinar: Options Analysis and Draft Recommendations	Engagement closed
October 5, 2026	Deadline for Feedback Feedback Form Feedback Received: Averon Energy Group Inc. Climate Justice Durham Mississaugas of Scugog Island First Nation Municipality of Clarington Power Workers’ Union Regional Municipality of Durham Town of Ajax Town of Whitby
September 14, 2026	Public Engagement Webinar: Options Analysis and Draft Recommendations Presentation GTA East Economic Assessment Supplemental Information Communication	Recorded Presentation
September 8, 2026	IESO Response to Feedback for Public Engagement Webinar: Electricity Needs and Options Screening - Revised
May 11, 2026	Deadline for Feedback Feedback Form Feedback Received: City of Oshawa Climate Justice Durham Mississaugas of Scugog Island First Nation Municipality of Clarington Power Workers’ Union Regional Municipality of Durham Toronto and Region Conservation Authority Town of Ajax Town of Whitby	All feedback posted
April 20, 2026	Public Engagement Webinar: Electricity Needs and Options Screening Communication Presentation	Recorded Presentation
October 6, 2025	IESO Response to Feedback for Public Engagement Webinar: Demand Forecast
August 6, 2025	Deadline for Feedback Feedback Form Feedback Received: Municipality of Clarington Town of Ajax	All feedback posted
July 16, 2025	Public Engagement Webinar: Demand Forecast Presentation IRRP Forecasting Methodology Data Tables Engagement Plan Communication	Recorded Presentation
April 25, 2025	GTA East Scoping Assessment Outcome Report posted 2025 GTA East Scoping Assessment Outcome Report Communication
April 15, 2025	Deadline for public comment on Scoping Assessment Feedback Form No feedback received
April 1, 2025	Scoping Assessment Outcome Report Communication Draft Scoping Assessment Outcome Report	Narrated Presentation