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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. 

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Corporate IESO

Marking the anniversary of the 2003 Blackout

This week in 2003, some 50 million people in Ontario and the northeastern U.S. lost their power – marking the largest blackout in North America’s history.

Today, mandatory reliability requirements for the North American grid, greater coordination among system operators, robust long-term planning, new supply options, and an increased focus on cybersecurity, help ensure power is available when Ontarians need it.

Learn more: A Look Back at the Blackout.

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Get Involved in IESO Engagement Initiatives

Stakeholder and community engagement is integral to the IESO's decision-making process. The goal is to provide individuals and organizations with the opportunity to provide input and feedback about proposed decisions or changes that affect them.


The IESO supports transparency, efficiency and consistency in its engagement efforts. Engagement principles guide the conduct of the IESO and participants to ensure an efficient and effective process.


See Active Engagements for the status of current initiatives.

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Strengthening Communities through Energy Efficiency

The Municipal Energy Profile, recently released by the IESO, is a comprehensive report that explores some of the ways Ontario municipalities have been able to achieve significant energy and cost savings. It also identifies further opportunities and provides municipalities with valuable information to inform their energy conservation plans.

To read the report, visit the Municipal Energy Profile webpage.

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Kilowatt Way

Whether you live in an apartment or a house – four quick questions will reveal how you use electricity and show you ways to become more energy efficient.

Visit Kilowatt Way