Connecting Today.
Powering Tomorrow.

The Independent Electricity System Operator (IESO) works at the heart of Ontario's power system. The IESO delivers key services across the electricity sector including: managing the power system in real-time, planning for the province's future energy needs, enabling conservation and designing a more efficient electricity marketplace to support sector evolution.

Demand

Hourly Ontario Demand EDT

Projected Demand at 8:00 pm EDT

Today's Projected Peak at 8:00 pm EDT

All data is available through the Data Directory.

Follow the IESO's Peak Tracker to monitor forecasted Ontario demand for the next 24 hours.

Supply

Hourly Output by Fuel Type (Transmission-Connected) at 1:00 pm EDT

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

Indigenous Energy Support Program

The 2026 Indigenous Energy Support Program (IESP) application window is now open. Funding is available to support energy planning, infrastructure development, and capacity building for First Nation and Métis communities and organizations. Applications close October 2. Learn more and apply.