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.
Introducing the IESO Renewed Market
The IESO has improved the way electricity is scheduled and priced across the province. These changes ensure we can continue to make the most cost-effective use of our supply every hour of every day as the grid expands to meet growing demand and incorporate new technologies.
The 2025 Annual Planning Outlook
The IESO’s 2025 Annual Planning Outlook (APO), a yearly forecast of electricity demand, supply and transmission outlooks, system reliability needs and planned actions, is now available. The APO offers a long-term view of Ontario's electricity system, forecasting Ontario’s system needs and exploring the province’s ability to meet them. View the APO and related data.
Stakeholder Engagement Meetings
The agenda for the May 21 - 22 stakeholder engagement meeting is now available.
Meeting materials and recorded presentations for the April stakeholder engagement meetings are also posted.
News and Updates:
- Quarterly Bulk Planning Webinars May 22, 2025
- New Market Data Page - A New Way of Looking at the IESO Market May 22, 2025
Upcoming Events:
- APO/Demand Forecast May 21, 2025
- eDSM Industrial Program Evolution May 22, 2025