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 North Region (York Region) roughly comprises of municipalities in the Regional municipality of York, including the Cities of Markham, Richmond Hill and Vaughan, the Towns of Aurora, East Gwillimbury, Georgina, Newmarket, Whitchurch-Stouffville, and the Township of King. Since the electricity system was not developed along municipal boundaries, customers in some areas near the boundaries of York Region are supplied from infrastructure outside this region. Some customers in Durham and Simcoe counties, and the City of Toronto are supplied from the York Region infrastructure.
The region also includes a number of Indigenous communities, 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
Mississaugas of Scugog Island First Nation
Mississaugas of the Credit First Nation
Six Nations of the Grand River as represented by Six Nations Elected Council as well as the
Haudenosaunee Confederacy Chiefs Council
Métis Nation of Ontario
The local distribution companies providing services to customers in the area include:
Alectra Utilities
Hydro One Networks Inc.
Newmarket-Tay Power Distribution Ltd.
Toronto Hydro Electric System
Community Engagement
The 2025 GTA North Integrated Regional Resource Plan (IRRP) has been posted along with the IESO’s response to feedback received following the September 22, 2025 engagement webinar. The report details several plan recommendations to address the significant electricity needs in the GTA north driven by economic development, the electrification of buildings and transportation, and growth driven by provincial housing targets. There are currently no active regional planning engagement activities for this region. See Key Resources below and the engagement webpage for the latest planning documents.
The 2025 GTA North Integrated Regional Resource Plan (IRRP) has been posted along with the IESO’s response to feedback received following the September 22, 2025 engagement webinar. The report details several plan recommendations to address the significant electricity needs in the GTA north driven by economic development, the electrification of buildings and transportation, and growth driven by provincial housing targets. There are currently no active regional planning engagement activities for this region. See Key Resources below and the engagement webpage for the latest planning documents.
If you would like to learn more about planning activities across the GTA, visit the IESO's Powering the GTA website.
