Connecting Today.
Powering Tomorrow.
The Independent Electricity System Operator (IESO) works at the heart of Ontario’s electricity system, managing the grid in real time, planning for future energy needs, and delivering energy efficiency programs to ensure a reliable electricity system that supports economic growth and a changing energy future.
New Transmission Recommendations
In response to rising demand and evolving reliability needs, the IESO has developed three plans that outline recommendations for a phased approach to new and reinforced transmission infrastructure across Ontario. Learn more: North of Sudbury Bulk Plan | Eastern Ontario Bulk Plan | South and Central Bulk Plan
Energy Efficiency Day
National Energy Efficiency Day is on Oct. 7 this year. As Save on Energy marks its 15th anniversary, energy efficiency has always been a low-cost, non-emitting resource that ensures Ontario’s system stays reliable, affordable and sustainable while also supporting economic growth. Learn more.
Stakeholder Engagement Meetings
The agenda for the October 14-16 stakeholder engagement meetings is now available.
Meeting materials and recorded presentations for the September stakeholder engagement meetings are also posted.
News and Updates:
- IESO Securing Additional Short-Term Capacity October 01, 2026
- October Stakeholder Engagement Meetings - Reminder to Register October 05, 2026