GTA North (York Region)


For regional planning purposes, the electrical boundaries of GTA North roughly align with the Regional Municipality of York, or simply York Region. GTA North and York Region are therefore often used interchangeably throughout electrical studies.

About GTA North (York Region)

The region is often divided between Southern and Northern York Region to reflect the layout of the region's electricity infrastructure. Southern York Region roughly includes the municipalities of Vaughan, Markham and Richmond Hill, while Northern York Region roughly encompasses the municipalities of Aurora, Newmarket, King, East Gwillimbury, Whitchurch-Stouffville and Georgina. Because 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, and some customers in Durham and Simcoe counties, and City of Toronto, are supplied from the York Region infrastructure.

The local distribution companies (LDCs) providing service to customers in the area include

  • Alectra Utilities
  • Hydro One Networks Inc.
  • Newmarket-Tay Power Distribution Ltd.
  • Toronto Hydro Electric System
  • Veridian Connections Inc.

Community Engagement

An engagement initiative was undertaken for interested parties to learn more about electricity planning activities undertaken for York Region and offer input for consideration into the recommendations outlined in the IRRP. This engagement is now closed, but the related materials can be found on the engagement initiative site.

Regional Planning Activities in GTA North (York Region)

The regional planning cycle was completed for York Region with the release of an Integrated Regional Resource Plan (IRRP) in February 2020 and the supporting Appendices in March 2020. A Regional Infrastructure Plan (RIP) led by Hydro One will be completed by mid-2020. A Scoping Assessment Outcome Report and Terms of Reference for GTA North (York Region) IRRP was finalized and posted in August 2018, following a two-week comment period.

Visit here for more information about the Regional Planning Process. See below for past regional planning activities in this region.

GTA North Technical Working Group

A Technical Working Group will follow the regional planning process to discuss opportunities to identify and meet local electricity needs. For the purposes of this regional planning activity, the Technical Working Group will consist of representatives from the three LDCs in the area - Newmarket-Tay Power, Alectra Utilities, Hydro One Networks Inc. (also Transmitter), and the IESO.

2015 Regional planning process outcome

York Region

The regional planning cycle begun in 2013 for the York sub-region was completed in April, 2015 and an Integrated Regional Resource Plan (IRRP) was released.

In the near term, three transmission projects are recommended to address capacity and reliability needs; these projects are already under development by Hydro One and Alectra Utilities (formerly PowerStream).

In the medium to long term, York sub-region's electricity system is expected to reach its capacity to supply growth in the early to mid-2020s based on current projections. If the growth materializes, there will be a need for additional new supply in the region. The Working Group will seek community input on possible solutions.


2015 GTA North IRRP

2015 GTA North IRRP – Appendix

Related Studies

A portion of northwest Vaughan is being studied through a separate initiative. Please visit the Related Studies section of the GTA West regional planning webpage for more information about the Northwest GTA Transmission Corridor Study.

Documents referenced on this page, but not posted, can be obtained by contacting with a link to the web page that lists the document and advise whether it needs to be provided in an accessible format. Please allow a minimum of one business day for a response.