The five planning regions in the GTA and Central Ontario area includes all of the Greater Toronto Area, stretches north to Parry Sound/Muskoka, and roughly spans the area from Meaford to Minden.
The South Georgian Bay/Muskoka region is located in central Ontario and includes more than 30 municipalities and 10 First Nation communities. The South Georgian Bay/Muskoka region includes two sub-regions: Barrie/Innisfil sub-region and Parry Sound/Muskoka sub-region.
The local distribution companies providing services to customers in the area include:
Alectra Utilities
Elexicon Hydro
EPCOR Electricity Distribution Ontario Inc.
Hydro One Networks Inc.
InnPower Corporation
Lakeland Power
Newmarket-Tay Power Distribution Ltd.
Orangeville Hydro
Community Engagement
The IESO engages with local and regional communities to seek input to help inform planning activities. See Key Resources below for the latest planning documents.
Regional electricity planning has kicked-off in the South Georgian Bay-Muskoka electrical region to ensure a reliable supply of electricity, and to support local growth and economic development.
The most recent regional planning cycle for Barrie/Innisfil and Parry Sound/Muskoka sub-regions were completed in May 2022 with the release of the Barrie/Innisfil Integrated Regional Resource Plan (IRRP), the Parry Sound/Muskoka IRRP and the supporting IRRP Appendices and Bulk Appendices found in key resources below. The IRRPs recommend near-term actions for new transformer infrastructure and upgrades, and long-term monitoring of demand growth and electrification trends. Additionally, the IRRPs emphasize the importance of implementing energy efficiency and conservation measures to defer future needs.
A regional Infrastructure Plan (RIP) led by Hydro One was published in December 2022.
Documents referenced on this page, but not posted, can be obtained by contacting customer.relations@ieso.ca with a link to the web page that lists the document and advise whether it needs to be provided in an accessible format. Please allow a minimum of one business day for a response.
