Parry Sound/Muskoka sub-region

The regional planning cycle for the Parry Sound/Muskoka sub-region was completed in December 2016 and an Integrated Regional Resource Plan (IRRP) was released.

Community Engagement

The IESO engages with local and regional communities to seek input to help inform regional planning activities. An Integrated Regional Resource Plan (IRRP) from the latest Parry Sound-Muskoka planning cycle was finalized in 2016. See engagement materials on the previous planning cycle.  

Regional Planning Status

Given the large geographical area, many communities in the Parry Sound/Muskoka sub-region are supplied by long transmission and distribution networks and rely on single supply sources. Regional planning will examine the reliability performances of the transmission and distribution infrastructure and where appropriate, examine options to mitigate the potential impact of power outages to communities and businesses in the area.  

In addition, given the forecasted demand growth in this sub-region, there may be opportunities for communities to manage growth through the development of community-based solutions, including energy efficiency measures, distributed generation, demand response programs and other innovative technologies.

2016 Parry Sound/Muskoka IRRP - Appendices
Key Resources


IESO Hand-off Letter to Hydro One (March 16, 2017)

Hydro One Regional Planning

Documents referenced on this page, but not posted, can be obtained by contacting 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.

IRRP Working Group - Next Steps

A Working Group consisting of the local distribution companies in the region, the local transmitter and the IESO will use the regional planning process to identify and meet local electricity needs. The Working Group consists of staff from Alectra Utilities, Lakeland Power, Midland PUC, Newmarket-Tay Power, Orillia Power, Veridian Connections, Hydro One Distribution, Hydro One Transmission and the IESO.

Area Overview

The Parry Sound/Muskoka sub-region roughly encompasses the Districts of Muskoka and Parry Sound, and the northern part of Simcoe County. This sub-region also includes eight First Nation communities:  Beausoleil, Chippewas of Rama, Henvey Inlet, Magnetawan, Moose Deer Point, Shawanaga, Wahta Mohawks and Wasauksing.

Electricity demand is primarily driven by residential and commercial uses, especially electric heating during the winter season. This region also supports a mix of economic activities including tourism, retail, health care and manufacturing industries. Electricity demand in this area typically peaks during the winter months, with historical peak demand ranging from around 470- 530 MW

A modest increase in electricity demand is forecasted over the next 20 years for the area.  While slower growth is expected in the region's manufacturing sector, growing Indigenous communities, developments in the tourism and retail sector, and potential local economic development such as the Parry Sound Airport Development and Rama Road Corridor Economic Employment District, will contribute to the electricity demand.