GTA North (York Region)
Area Overview
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
Regional Planning Progress Update
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.
Key Resources
2025 GTA North Integrated Regional Resource Plan (IRRP)
2023 York Region Scoping Assessment Outcome Report
2023 York Region Needs Assessment - Hydro One
2020 York Region Regional Infrastructure Plan - Hydro One
2020 York Region Integrated Regional Resource Plan