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 kicked off in August 2022 beginning with the Needs Assessment (NA). The NA for this region was completed in December 2022. It identified the needs in the region and recommended that further regional coordination is required, and subsequently Scoping assessment was published by IESO in March 2022.​

Accomplishment (Most Recent Shown First) Status Completion Date​
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

Integrated Regional Resource Planning (IRRP)
Name Completion Date
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

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