Welcome to the new IESO. By merging with the Ontario Power Authority, the IESO offers services, information and analysis to support Ontario's diverse electricity system. A central hub connecting its many stakeholders, the IESO reliably operates the system in real time, while ensuring its extensive planning, conservation, market and procurement capabilities serve the province's long-term needs.
Every five minutes, the IESO forecasts the demand for electricity and ensures sufficient supply to meet that demand. It does this through the wholesale market where the price of electricity is set.
The IESO works with a broad range of industry partners and stakeholders across the province to plan the electricity system for the long term, and secure clean electricity resources.
Working with our partners, the IESO guides the province's electricity conservation efforts by supporting programs that foster a culture of conservation, build market capability and promote innovation.
IESO Conservation Fund
Learn about Ontario's power system – from the types of generation used and how the province plans for the future to pricing and what it takes to maintain a reliable system.
Ontario's Power SystemManaging a Reliable Grid
Find your Local Distribution CompanyPower System Planning »
Current Hour's Demand
Hourly Output by Fuel Type
Installed capacity of wind and solar generation connected to local distribution systems.
as of September 2014
Current Hourly Price
Hourly Ontario Energy Price ($/MWh)
The IESO ensures there is enough power to meet the province’s real-time energy needs while also planning and securing energy for the future.
About the IESO
Board of Directors
Stakeholder engagement is integral to the IESO's decision-making process - providing individuals and organizations opportunities to provide input about proposed changes that affect them.
Stakeholder Engagementat the IESO:
Generation and ProcurementMarket and System
IESO Stakeholder Advisory CommitteeOPA Stakeholder Advisory Committee