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In the IESO's Media Centre, reporters will find timely and relevant information about the IESO, Ontario's power system and the wholesale electricity market.

​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​For media inquiries, please contact 416.506.2823 or media@ieso.ca​

​Latest News from the IESO

Briefing Room

Energy Storage 

Storage offers a variety of benefits to the grid.

 Demand Response 

Consumers are having a growing influence on the grid.

 Cyber Security 

An important reliability standard.

Image of the IESO Control Room.

Power Data

Fast Facts (Year-End 2015)

​Installed Capacity35,221 MW
Record Summer Peak27,005 MW (August 1, 2006)
​Record Winter Peak 24,979 MW (December 20, 2004)
​Consumers Served4.9 million
​Transmission Lines30,000 KM
​Ontario Import Capability 4,500-5,200 MW
​IESO Wholesale Market$14 billion in financial transactions
​Average Weighted Price2.36 ¢​/kWh
​Total Annual Energy Consumed137 TWh

Energy Output by Fuel Type (2015)   


Real-time demand, supply and price data »

Energy Output by Fuel Type, 2015 

Due to rounding, percentages may not add to 100.