The St. Lawrence region covers the southeastern part of Ontario bordering the St. Lawrence River. The region starts at the Leeds and the Thousand Islands on the eastern end of Lake Ontario and extends to the inter-provincial boundary with Quebec.
The local distribution companies providing services to customers in the area include:
Cooperative Hydro Embrun Inc.
Fortis Ontario Inc.
Hydro One Networks Inc.
Rideau St. Lawrence Distribution Inc.
Community Engagement
The IESO engages with local and regional communities to seek input to help inform planning activities.
Regional Planning Progress Update
To keep pace with the rapid growth and economic development in the St. Lawrence region, the St. Lawrence Region Technical Working Group (comprising of the IESO, Hydro One Networks Inc., Cooperative Hydro Embrun Inc., Fortis Ontario Inc., and Rideau St. Lawrence Distribution Inc.) have implemented a streamlined regional planning process by conducting the Scoping Assessment in an accelerated manner. This enabled the Technical Working Group to move directly into the development of an Integrated Regional Resource Plan (IRRP) for the St. Lawrence region. This approach reflected feedback received through stakeholder engagement and aligned with government priorities around economic development.
This IRRP, covering the entire St. Lawrence region, has commenced on April 14, 2026. Engagement will continue throughout the development of the IRRP with more details to follow. The St. Lawrence engagement webpage will be a source of ongoing information related to regional planning activities, including any upcoming engagement opportunities.
