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Greater Toronto Area North Regional Planning

Regional electricity planning is underway in the Greater Toronto Area (GTA) North region. A Working Group consisting of the local distribution companies in the region, the local transmitter and the IESO use the regional planning process to identify and meet local electricity needs. There are two sub-regions within this region: York Region and GTA North Western. 

Current status: An Integrated Regional Resource Plan (IRRP) has been released for the York Region.  

The GTA North Western sub-region was addressed as part of the Northwest GTA IRRP. For more information on the GTA North Western sub-region, please see the GTA West Regional Planning webpage.


The local distribution companies providing service to this region include: Enersource Hydro Mississiauga Inc., Hydro One Brampton Networks Inc., Hydro One Networks Inc., Newmarket-Tay Power Distribution Ltd., PowerStream Inc., Toronto Hydro Electric System, and Veridian Connections Inc. 


Regional Planning Initiatives Currently Underway in GTA North

York Region sub-region

The York Region sub-region includes the municipalities of Vaughan, Markham, Richmond Hill, Aurora, Newmarket, King, East Gwillimbury, Whitchurch-Stouffville and Georgina. York Region is one of the fastest growing areas of Ontario. Extensive urbanization in the last several years has meant that its electricity demand growth has been greater than the provincial average. Official growth plans for the region anticipate that strong growth in the area will continue into the future. As a result, there is a need for integrated planning to ensure that electricity supply can support the pace of development in the long term.

Current status: An Integrated Regional Resource Plan (IRRP) has been released for this sub-region.


IRRP Outcome

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 PowerStream. In the medium to long term, York 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.


How to get involved

A Local Advisory Committee has been established to provide advice on the development of the region's longer-term electricity plan, including how best to engage the community in this discussion. Thank you to all who submitted a nomination.

To find out when the Local Advisory Committee is meeting and to participate, see York Region engagement iniatitive.

Subscribe to receive updates on the status of the plan and to learn about opportunities for municipalities, First Nation and Métis communities, community groups, stakeholders and the general public to provide input.


IRRP Working Group

The Working Group, consisting of staff from Newmarket-Tay Power, PowerStream, Hydro One Networks Inc., and the IESO will use the regional planning process to identify and meet local electricity needs.


Area overview

York Region is a sub-region within the Greater Toronto Area North region. For regional planning purposes, the region is further divided into 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 the scope of this IRRP, and some customers in Durham and Simcoe counties are supplied from the York Region infrastructure.

In addition, a portion of Vaughan is being studied through a separate process as part of the GTA West sub-region.

Map of York Region sub-region  Map of GTA North York SubRegion


Historical context

In 2005, the OPA (now merged with the IESO) led the development of an integrated plan for Northern York Region, which identified several actions, including the development of conservation resources, a new transformer station and local generation. These actions have been largely implemented and are providing a reliable supply of electricity to Northern York Region. Read more about 2005 Northern York Region Study.


GTA North Western sub-region

The GTA North Western sub-region consists of electricity infrastructure located in the western portion of the City of Vaughan. This infrastructure supplies customers in Vaughan, Mississauga, Brampton and the City of Toronto.

PowerStream Inc., Enersource Hydro Mississauga Inc., Hydro One Brampton Networks Inc., Toronto Hydro-Electric System Inc., and Hydro One Networks Inc. are the local distribution companies in this sub-region.

Current status: The GTA North Western sub-region was addressed as part of the Northwest GTA IRRP which has been released. For more information, please visit the GTA West Regional Planning webpage.