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About the IESO
Managing the Power System
Overseeing the Electricity Market
Planning for the Future
Engaging Communities
Working with Our Sector Partners
Ontario's Electricity Grid
Supply Mix and Generation
Distributed Energy Resources
Imports and Exports
Energy Efficiency
Demand Response
Energy Storage
Hydrogen
Cyber Security
The Evolving Grid
Securing New Energy Supply
Planning the Electricity System
Decarbonizing the Electricity Sector
Decarbonizing Ontario's Economy
Electricity Pricing Explained
The Value of Electricity Markets
The Ontario Price
Global Adjustment
Pricing for Residents and Small Businesses
Pricing for Medium and Large Businesses
Electricity Facts and Tools
Electricity Facts
Helpful Tools
Electricity Explained Video Series
Find Your Local Distribution Company
Get Involved
Get Involved
Energy Efficiency for Homes and Business
There are many ways to participate in energy efficiency efforts - learn how.
Regional Planning
Get involved with power planning for your region.
Bulk Planning
Investing in energy efficiency provides opportunities beyond energy savings.
Innovation
Find out what the IESO is doing to enable innovation in support of its mandate.
Indigenous Relations
Indigenous communities are increasingly playing an active role in Ontario's energy sector.
microFIT Program
Updates and resources for Ontario's microFIT Program are available here.
Stakeholder Engagement
Provide input and feedback on proposed changes affecting Ontario's electricity sector.
Community Engagement
Engaging with communities is an important part of maintaining a reliable electricity supply, now and in the future.
Decarbonization Hub
Preparing an orderly transition from natural gas generation to other forms of non-emitting supply.
Data Hub
Data Hub
Market Data
Data and visuals of provincial/local prices for day-ahead and real-time markets, plus provincial/zonal demands.
Power Data
Snapshot of key demand, supply and price information for Ontario.
Data Directory
A collection of all reports provided on the IESO Public Reports site as well as access to historical data.
Monthly Market Reports
Monthly summaries of market activity.
Peak Tracker
Follow the Peak Tracker to monitor forecasted Ontario demand for the next 24 hours.
Demand Overview
Read more about Ontario’s electricity demand records, forecasts and related real-time reports.
Supply Overview
Get current and historical data for Ontario’s transmission and distribution level supply and yearly import/export data.
Price Overview
Learn how electricity prices are determined in Ontario’s electricity market, including global adjustment rates and time-of-use.
Powering Tomorrow
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Calendars
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Events Calendar
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Stakeholder Engagement Meetings: April 22 - 24
Stakeholder Engagement Meetings: April 22 - 24
22 Apr 2025 - 24 Apr 2025
April 2025
