The five planning regions in the GTA and Central Ontario area includes all of the Greater Toronto Area, stretches north to Parry Sound/Muskoka, and roughly spans the area from Meaford to Minden.
The GTA East region extends from Lake Ontario northward to the southern parts of the Townships of Scugog and Uxbridge, and includes the Cities of Pickering and Oshawa, Towns of Ajax and Whitby, Municipality of Clarington and the Regional Municipality of Durham.
The region also encompasses several Indigenous communities that may be potentially impacted or may have an interest based on treaty territory, traditional territory or traditional land uses, including Alderville First Nation, Beausoleil First Nation, Chippewas of Georgina Island First Nation, Chippewas of Rama First Nation, Curve Lake First Nation, Hiawatha First Nation, Kawartha Nishnawbe First Nation, Mississaugas of Scugog Island First Nation, Mississaugas of the Credit First Nation, Métis Nation of Ontario.
The local distribution companies in the area include:
Elexicon Energy Inc.
Hydro One Networks Inc.
Oshawa Power Utilities Corp.
Regional Planning Progress Update
The 2026 GTA East Integrated Regional Resource Plan (IRRP) has been posted along with the IESO’s response to feedback received following the September 14 public engagement webinar. The report details implementation-ready recommendations to meet demand and ensure reliability of the electricity system in the GTA East region in the near- term while outlining considerations to be studied in future regional planning cycles. These recommendations are outlined in detail in the final IRRP report and summarized in the Fact Sheet.
To stay informed on future electricity planning activities across the GTA, visit the IESO's Powering the GTA website and subscribe to receive updates on the GTA East region.
