Region Overview

The Greater Toronto Area (GTA) North Region is approximately bounded by the Regional Municipality of York, and also includes parts of the City of Toronto, Brampton, and Mississauga. The region is divided into two sub-regions: 

  • York Sub-region: This area includes Southern York area (the Municipalities of Vaughan, Markham, and Richmond Hill), and Northern York area (the Municipalities of Aurora, Newmarket, King, East Gwillimbury, Whitchurch-Stouffville, Georgina, and some parts of Simcoe County supplied from the same electricity infrastructure). 
  • Western Sub-region: This area comprises the western portion of the City of Vaughan.

Region's Local Distribution Companies

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

Map: GTA North

Current Status

The third regional planning cycle for this region was kicked off in March 2023 beginning with the Needs Assessment (NA). The NA for this region was completed in July 2023. It identified the needs in the region and recommended that further regional coordination is required, and subsequently Scoping assessment was published by IESO in October 2023.

(Most Recent Shown First)
Status Completion Date
Scoping Assessment (3rd Cycle) Completed October 2023
Needs Assessment (3rd Cycle) Completed July 2023
Regional Infrastructure Planning
(2nd Cycle)​​
Completed October 2020
Integrated Regional Resource Planning (2nd Cycle)
Completed February 2020
Scoping Assessment (2nd Cycle)
August 2018
Needs Assessment (2nd Cycle)
​March 2018

*The completed reports are available below. 

Relevant Documents

Regional Infrastructure Planning (RIP)
Name Completion Date
GTA North RIP - Report (2nd Cycle) October 2020
GTA North RIP - Report February 2016

Integrated Regional Resource Planning (IRRP)
Name Completion Date
GTA North IRRP – Report (2nd Cycle)  February 2020
GTA North IRRP – Appendices (2nd Cycle)  February 2020

Needs Assessment (NA) and Scoping Assessment (SA)
Name Completion Date
GTA North SA – Report (3rd Cycle) ​October 2023​
GTA North NA – Report (3rd Cycle) ​July 2023​
GTA North SA – Report (2nd Cycle) ​August 2018​
GTA North NA - Report (2nd Cycle) March 2018
GTA North Western sub-region NA - Report  June 2014

Additional Documents
Name Completion Date
Markham-Richmond Hill Letter of Support April 2017
OPA Letter to Hydro One Regarding York Subregion  June 2013