GTA West


Regional electricity planning in the GTA West Region is underway to identify the future need of electricity and options to ensure an adequate and reliable supply continues for its residents and businesses. A Scoping Assessment Outcome Report was posted in August 2019 on the regional engagement page and an Integrated Regional Resource Plan (IRRP) is now proceeding for the region. For the purpose of engagement initiatives, the region is referred to as Peel/Halton (GTA West). 

Community Engagement

The IESO engages with local and regional communities to seek input to help inform planning activities. Learn more about engagement on the current planning cycle.

Area Overview

  • The GTA West Region roughly encompasses the Regional Municipalities of Halton and Peel, and consists of the Municipalities of Brampton, South Caledon, Halton Hills, Mississauga, Milton, Burlington and Oakville. GTA West and Peel/Halton Region are often used interchangeably throughout electrical studies.

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

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

 The previous planning cycle included the following IESO activities:

  • Release of an Integrated Regional Resource Plan (IRRP) for the GTA West Northern sub-region (“Northwest GTA”) in April 2015, followed by the publication of a Regional Infrastructure Plan (RIP) in January 2016
  • Completion of a Scoping Assessment for the GTA West Southern sub-region in September 2014 that concluded needs would be addressed through local coordination between the transmitter and LDC(s)

Previous cycle regional planning activities

The Northwest GTA sub-region was the focus of the previous planning cycle due to the high load growth, expanding urban boundaries, limited existing electrical infrastructure, and the requirement for coordination with bulk system plans.

Northwest GTA sub-region

The last regional planning process cycle for the Northwest GTA sub-region was completed in April 2015 and an Integrated Regional Resource Plan (IRRP) was released, which identified the following:

  • Near-term need for two new step-down transmission facilities to ensure new customer connections can be accommodated in Halton Hills and Milton
  • Medium-term need for a transmission line upgrade to address emerging capacity needs in the central Brampton area
  • Long-term need to provide additional transformer and transmission line capacity in Northern Brampton/Southern Caledon and Halton Hills to meet forecast demand growth

Key Resources

GTA West Southern sub-region

The Scoping Assessment Outcome Report completed for the GTA West Southern sub-region in 2014 concluded that no further regional coordination was required in that cycle. It was determined that load restoration needs would be addressed through other planning studies and local coordination around infrastructure investments.

Key Resources

Related Studies

The IESO and the Ministry of Energy, Northern Development and Mines have initiated a joint study to identify land to be protected for a future transmission corridor to support anticipated long-term growth in demand for electricity in the GTA West region. Part of ongoing efforts to plan today to avoid future costs to electricity ratepayers, this initiative will ensure that transmission needs – documented through the regional planning process – in the study area (see map below) can be accommodated if and when they arise.

Although the area of study is primarily centered in the GTA West planning region, parts extend into GTA North (see maps below). This study is separate from but will continue in parallel with the Ministry of Transportation’s (MTO) GTA West Transportation Corridor Route Planning and Environmental Assessment (EA) Study.

Update: The study team released a revised study area (see map below) related to the Northwest GTA Transmission Corridor Identification Study. The study is ongoing and comments will continue to be considered with subsequent study milestones. A Decision Summary is now available on the Environmental Registry of Ontario’s webpage which outlines the comments heard and how they were considered in this first phase of the study.

Comments and input regarding this study are encouraged and can be sent to NWGTATransmissionCorridor@ontario.ca.

To contact the project team directly or be added to the mailing list, please email NWGTATransmissionCorridor@ontario.ca.


2020 Narrowed Area of Interest

Map of the narrowed area of interest. A preliminary study in June 2019 identified a larger possible area that was further refined in 2019. In 2020 the area of interest was narrows down further and currently runs from the Town of Milton to the City of Vaughan and crosses through the regional municipalities of Halon, Peel and York.

The map shows the current transmission corridor study area and a purposed transmission narrowed area of interest. The corridors run from the intersection of Highways 401 and 407 to the northwest of the City of Mississauga, around the City of Brampton, ending north of the City of Vaughan in the east.

Download a copy of the map: English | French


 

2020 Narrowed Area of Interest compared to MTO's 2020 Focused Analysis Area

Map showing 2020 narrowed area of interest compared to MTO’s 2020 focused analysis area. The new are runs rom approximately the Town of Milton to the City of Vaughan and crosses the regional municipalities of Halton, Peel and York. The are being considered by the MTO overlaps with the ENDM/IESO NAI. 

The map shows proposed transmission narrowed area of interest compared to the Ministry of Transportation's 2020 Focused Area Analysis. The corridors run from the intersection of Highways 401 and 407 to the northwest of the City of Mississauga, around the City of Brampton, ending north of the City of Vaughan in the east.

Download a copy of the map: English | French