Ottawa sub-region


The regional planning cycle is underway for the Ottawa Area sub-region, with an Integrated Regional Resource Plan (IRRP) anticipated to be posted in Q2 2019.

A Scoping Assessment Outcome Report and Terms of Reference for the Ottawa Area IRRP was finalized and posted in September 2018, following a two-week comment period.

For more information, see Regional Planning Process. See below for past regional planning activities in this region.

2015 Regional Planning Process Outcome (IRRP)

In the near-term, four transmission and distribution reinforcement projects are recommended to address demand growth and reliability needs; work on these projects is underway by Hydro One. The Working Group will ask for community input on addressing the need for additional supply to meet electricity demand growth in the South Nepean area, which is expected to be required around 2020.

No specific long-term needs for the region have been identified at this time beyond the possible end-of-life of a station in east Ottawa before 2025, which will be addressed in the next planning cycle.

IRRP Working Group - Next Steps

A Working Group consisting of the local distribution companies in the region, the local transmitter and the IESO will make recommendations to address the longer-term needs in the region based on planning criteria and consideration of community input.

The Working Group currently consists of representatives from Hydro Ottawa, Hydro One Distribution and Transmission and the IESO. 

Community Engagement

The IESO engages with local and regional communities to seek input to help inform planning activities. See engagement materials on the previous planning cycle.

Sub-region overview

With a growing population of about 900,000 people and a peak demand of about 1,800 MW, the Ottawa sub-region is one of the largest electricity planning regions in Ontario. The sub-region has a diverse mix of electricity customers including government and commercial facilities, light industry, and residential consumers.

The Ottawa sub-region encompasses the City of Ottawa, including the Greenbelt, Kanata, Nepean and Orléans.

Historical Context

In the 1950s, the National Capital Commission established a Greenbelt around central Ottawa in an effort to contain growth. While the downtown core has continued to grow, development in recent years has largely occurred in the communities outside the Greenbelt.

Supplying these communities is challenging because the existing transmission system consists of long, single-circuit 115 kV or 230 kV lines with limited supply diversity. The reconfiguration of this older system presents challenges to meeting reliability criteria under extensive urbanization and load growth.