Introduction:
An Overview of the IESO-Administered Markets

This guide serves as an introduction to Ontario's wholesale electricity marketplace. It provides an overview of:

  • the Ontario electrical system
  • the role of the IESO in the Ontario electricity market
  • the roles of Market Participants
  • the types of markets administered by the IESO

This guide is designed principally for:

  • Electricity generators and distribution companies
  • Energy brokers
  • Any other organizations planning to participate in the Ontario electricity market

Note that explanations and examples of market operation found in this guide have been simplified, as this document is only intended to be an overview of Ontario’s electricity marketplace.

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Disclaimer: This guide has been prepared to assist in the IESO training of market participants and has been compiled from excerpts of the market rules and/or documents posted on the web site of the Independent Electricity System Operator. Users of this guide are reminded that they remain responsible for complying with all of their obligations under the market rules and associated policies, standards, and procedures relating to the subject matter of this guide, even if such obligations are not specifically referred to in this guide. While every effort has been made to ensure that the provisions of this guide are accurate and up to date, the user of this guide must be aware that the specific provisions of the market rules or particular documents shall govern.