Region Overview

The Greater Toronto Area (GTA) West Region covers the Regional Municipalities of Halton and Peel, comprising the Municipalities of Brampton, South Caledon, Halton Hills, Mississauga, Milton and Oakville. The region is divided into two sub-regions: 

  • Northern Sub-region: This area roughly covers the Municipalities of Brampton, Milton, Halton Hills, and southern part of Caledon. The population of this sub-region is over 700,000 and has been rapidly growing over the past 10 years. 
  • Southern Sub-region: This sub-region comprises the municipalities of Mississauga and Oakville.

Region's Local Distribution Companies

  • Burlington Hydro Inc.
  • Hydro One Networks Inc.
  • Alectra Utilities Co.
  • Milton Hydro Distribution Inc.
  • Halton Hills Hydro Inc.
  • Oakville Hydro Electricity Distribution Inc.

Map: GTA West

Current Status

The first regional planning cycle for this region is complete. The Regional Infrastructure Plan (RIP) for the region was published in January 2017. It is expected that the next planning cycle for this region be initiated in the next three to five years.

Accomplishment (Most Recent Shown First) Status Completion Date
Needs Assessment Report - GTA West
Completed May 2019
Regional Infrastructure Planning
Completed January 2016
Local Planning - Erindale TS Capacity  Completed July 2015
Integrated Regional Resource Planning - Northern Completed April 2015
Scoping Assessment Completed September 2014
​Needs Assessment Completed May 2014

*The completed reports are available below. 

Needs Assessment (NA) and Scoping Assessment (SA) were completed for the Southern Sub-region, and determined that the needs identified in the sub-region can be addressed directly by Hydro One and Local Distribution Companies (LDCs) and further regional coordination is not required.

Relevant Documents

Regional Infrastructure Planning (RIP)
Name Completion Date
RIP Report GTA West  January 2016

Integrated Regional Resource Planning (IRRP)
Name Completion Date
GTA West Northern Subregion - IRRP - Appendices  April 2015
GTA West Northern Subregion - IRRP - Report  April 2015

Local Planning (LP)
Name Completion Date
Local Planning Report - Erindale TS Capacity  July 2015

Needs Assessment (NA) & Scoping Assessment (SA)
Name Completion Date
Needs Assessment Report - GTA West  May 2019
GTA West Southern Subregion - Scoping Report  September 2014
Needs Assessment Report - GTA West - Southern Subregion  May 2014

Additional Documents
Name Completion Date
GTA West Supply Study  February 2006