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Contact Us

Have a question for the IESO about how to participate in the electricity market or a program? Want to make a comment or ask a question? We want to hear from you. Here's how you can reach us.

Questions for the IESO

Mailing Address

Independent Electricity System Operator
1600-120 Adelaide Street West
Toronto, ON M5H 1T1

Accessibility for Ontarians with Disabilities

As part of the IESO's efforts to meet the needs of people with disabilities, documents posted to this website will be made available in additional formats upon request to customer.relations@ieso.ca.

The IESO also welcomes feedback regarding the methods it uses to provide services to persons with disabilities. Feedback can be directed as follows:

  • by telephone (905.403.6900, toll-free: 1.888.448.7777)

  • in writing (IESO, Station A, Box 4474, Toronto, ON M5W 4E5, Attention: Customer Relations)

Any concerns not being adequately dealt with by the IESO can be raised with the IESO's General Counsel: