button button active
  • 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.


​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​Photo of IESO Control Room

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


18,920 MW

Current Hour's Demand at 11:00 a.m. EST

  • 18,783 MW
    Projected Demand
    at 12:00 p.m. EST
  • 20,451 MW
    Today's Projected Peak
    at 8:00 p.m. EST
  • 27,005 MW
    Summer Record Peak
    Aug 1, 2006



Hourly Output by Fuel Type at 11:00 a.m. EST

  • 2,049 MW
    Hourly Imports
  • 3,458 MW
    Hourly Exports
  • 28,927 MW
    Generator Availability at Peak
    at 8:00 p.m. EST


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

  • 1,305 MW
  • 391 MW
  • as of September 2014


4.24 ¢/kWh

Current Hourly Price at 11:00 a.m. EST

Hourly Ontario Energy Price ($/MWh)

  • 2.96¢/kWh
    Average Weighted Price
    for January
  • 5.07¢/kWh
    Global Adjustment
    for January

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 ​​


Image of IESO Staff 

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.

Image of people in a meeting