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Toronto Regional Planning

Regional electricity planning is underway in the Toronto planning area which is made up of two sub-regions - Central Toronto and Northern Toronto. A Working Group consisting of the local distribution company in the region, Toronto Hydro-Electric System Limited, the local transmitter and the IESO use the regional planning process to identify and meet local electricity needs. Subscribe to receive updates on the status of the plan and to learn about opportunities for municipalities, community groups, stakeholders and the general public to provide input.

Current status: An Integrated Regional Resource Plan (IRRP) has been released for the Central Toronto sub-region.

The Needs Assessment for the Northern Toronto sub-region was completed in June, 2014 and it was determined that the needs identified for this sub-region can be addressed directly by the transmitter and LDCs and that further regional coordination is not required.


Regional Planning Initiative Underway in this Region

Central Toronto sub-region

Central Toronto is one of the largest electricity consuming areas in the province. With over one million residents, electricity demand in this region peaks at about 2,000 MW. Extensive residential and commercial development, increased density and land use in the area have contributed to the steady growth in this region over the past several years. The downtown area has been identified in the City of Toronto Official Plan as an important area for future growth, and the current pace of building development indicates that growth is well underway.

Current status: An Integrated Regional Resource Plan (IRRP) has been released for this sub-region. 


IRRP Outcome

The near-term plan includes a number of measures to meet reliability standards, enhance supply security and ensure infrastructure options are available to connect new customers and meet demand growth requirements. In the long term, Central Toronto's electricity system is expected to reach its capacity to supply growth at the two major autotransformer stations and at key transmission facilities supplying the area in 2026 or later.


How to get involved

A Local Advisory Committee (LAC) has been established for Toronto. The role of the LAC is to provide advice and recommendations on the further development and implementation of the Central Toronto plan, an avenue for broader energy dialogue, and also act as a bridge between the five-year regional planning cycles. Thank you to all who submitted a nomination.

To find out when the LAC is meeting and to participate, see Toronto engagement initiative.

Subscribe to receive updates on regional planning initiatives in Toronto.


Area overview

The Central Toronto IRRP involves a sub-region of the City of Toronto and includes the area extending northward from Lake Ontario to within 0.5 km of Highway 401, westward to the Humber River and eastward to Victoria Park Avenue. Electricity to this area is primarily supplied by the 115-kilovolt (kV) Hydro One transmission system.  


Historical context

Plans for central Toronto have been developed and revised over many decades – by the former Ontario Hydro and most recently by the former OPA in the 2007 Integrated Power System Plan. Following from this 2007 study, investments were made in generation and transmission infrastructure to improve the reliability and security of the electricity supply, increase the local capacity for meeting electricity demand, and connect distributed and renewable energy generation within the city.       

Central Toronto map

Map of Central Toronto Region 


Northern Toronto sub-region

Information gathering for the northern sub-region of Toronto was initiated by Hydro One in late 2013. A needs assessment report was completed in June 2014, and is posted on Hydro One's regional planning page for the Toronto region.

Current status: The Needs Assessment for the Northern Toronto sub-region was completed in June, 2014. The study team determined that the needs identified for this sub-region can be addressed directly by the transmitter and LDCs and further regional coordination is not required. See Needs Assessment report on Hydro One's website.