Explore this website to understand how Ontario’s electricity market and system operate, as well as interact and participate in discussions about current topics affecting the industry. The IESO is available to answer your questions. Participate »
The IESO works at the heart of the electricity system, connecting the industry players who produce power, and then transport power on high voltage lines to the local utilities that distribute it to individual consumers. Ontario’s Power System »
Ontarians benefit from one of the most diverse and reliable electricity systems in the world. The IESO works at the heart of Ontario’s power system, balancing supply and demand through the electricity market. About the IESO »
Learn how all the components of Ontario's power system work together. New ideas and technologies are changing the way the IESO operates the grid.
Ontario's Power System
Evolving the Markets
Interact with Ontario's wholesale market as a generator, transmitter, large consumer, conveyer, or electricity service provider.
How to Register
Understanding your Market Obligations
Market Rules and Manuals Library
Current Hour's Demand
Hourly Output by Fuel Type
Current Hourly Price
Hourly Ontario Energy Price ($/MWh)
The IESO and stakeholders work together to evolve and strengthen the market, enhance reliability, and implement market efficiencies. Learn about opportunities to contribute to the discussion.
Stakeholder EngagementSAC and
Technical PanelStakeholder Summit 2014
The IESO manages the wholesale electricity market and oversees the reliable operation of the provincial electricity grid. Find out more about who we are and what we do.
What We DoIESO Annual ReportCorporate Accountability