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  • Ontario’s Electricity Hub

    Ontario's Electricity Hub

    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.

  • Power to Ontario. On Demand.

    Power to Ontario.
    On Demand.

    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.

  • Planning and Procurement

    Planning and Procurement

    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.


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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.

saveONenergy programs

Conservation First​​​

IESO Conservation Fund​​​

Ontario's Power System

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 System

Managing a Reliable Grid

Find your Local Distribution Company

Power System Planning »

Power Data


16,005 MW

Current Hour's Demand at 6:00 a.m. EDT

  • 17,400 MW
    Projected Demand
    at 8:00 a.m. EDT
  • 18,084 MW
    Today's Projected Peak
    at 8:00 p.m. EDT
  • 27,005 MW
    Summer Record Peak
    Aug 1, 2006

TUESDAY,  MARCH  31, 2015


Hourly Output by Fuel Type at 5:00 a.m. EDT

  • 524 MW
    Hourly Imports
  • 2,555 MW
    Hourly Exports
  • 30,025 MW
    Generator Availability at Peak
    at 9:00 p.m. EDT


Installed capacity of wind and solar generation connected to local distribution systems.

  • 1,503 MW
  •          425 MW
  • as of December 31, 2014


2.16 ¢/kWh

Current Hourly Price at 6:00 a.m. EDT

Hourly Ontario Energy Price ($/MWh)

  • 5.12¢/kWh
    Average Weighted Price
    for February
  • 3.96¢/kWh
    Global Adjustment
    for February

About the IESO

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 ​​

Leadership Team ​​

Corporate Reporting ​​


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Stakeholder Engagement

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.

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