Region Overview

The Toronto Region includes the area roughly bordered geographically by Lake Ontario to the south, Steeles Avenue to the north, Highway 427 to the west, and Regional Road 30 to the east. It consists of the city of Toronto, which is the largest city in Canada and fourth largest in North America. Toronto’s transformer stations can be grouped into five electrical zones based on their HV supply network

  • Leaside 115 kV Area

  • Manby 115 kV Area

  • East 230 kV Area

  • North 230 kV Area

  • West 230 kV Area

Region's Local Distribution Companies

  • Alectra Utilities

  • Elexicon Energy Inc.

  • Hydro One Networks Inc.

  • Toronto Hydro Electric System Limited



 



Map: Metro Toronto
 


Current Status

The Third Regional Planning cycle for this region was initiated with publishing of Needs Assessment report in December 2022 by Hydro One and followed by releasing of Scoping Assessment in March 2023 and Integrated Regional Resource Plan in October 2025 by the IESO. It is expected that the Regional Infrastructure Plan, which is the final step of Regional Planning cycle, will be completed by May 2026.​

Accomplishment (Most Recent Shown First) Status Completion Date​
Integrated Regional Resource Planning (3rd Cycle) Completed October 2025
Scoping Assessment (3rd Cycle) Completed March 2023
Needs Assessment (3rd Cycle) Completed December 2022
Regional Infrastructure Planning (2nd Cycle) Completed March 2020
Integrated Regional Resource Planning (2nd Cycle) Completed August 2019
Scoping Assessment- (2nd Cycle) Completed February 2018
Needs Assessment (2nd Cycle) Completed October 2017

*The​ completed reports are available below.​


Relevant Documents

Regional Infrastructure Planning (RIP)
Name Completion Date
Toronto RIP - Report (2nd cycle)  March 2020
Toronto RIP - Report  January 2016
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Integrated Regional Resource Planning (IRRP)
Name Completion Date
Toronto IRRP – Report (3rd Cycle)  October 2025
Toronto IRRP – Report (2nd Cycle)  August 2019
Toronto/Central Downtown sub-region – Report  April 2015
Toronto/Central Downtown sub-region IRRP – Appendices  April 2015


Needs Assessment (NA) & Scoping Assessment (SA)
Name Completion Date
Toronto SA – Report (3rd cycle)  March 2023
Toronto NA – Report (3rd cycle)  December 2022
Toronto SA - Report (2nd Cycle)  February 2018
Toronto NA - Report (2nd cycle)  October 2017
Toronto/Northern sub-region NA - Report  June 2014

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Local Planning (LP)
Name Completion Date
Local Planning Report - Metro Toronto C10A  August 2015


Additional Documents
Name Completion Date
OPA Letter to Hydro One Regarding Central Toronto Subregion  December 2013
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