Working with Our Sector Partners

Ensuring there is enough energy to meet demand - 24 hours a day, 7 days a week - requires close co-ordination between the many moving parts that make up Ontario’s electricity sector.

Infographic explaining the role of the IESO in Ontario's electricity system and how the IESO works with generators, transmitters, local distribution companies and communities.

System and Market Operator – The Independent Electricity System Operator (IESO)

The IESO works at the heart of Ontario's power system by directing the flow of electricity across the province’s transmission lines and administering Ontario’s electricity markets. The IESO monitors supply and demand in real-time - 24 hours a day, 7 days a week - ensuring that enough energy is available when and where it is needed. The IESO also works with communities and stakeholders to forecast energy demand and plan changes to the system that ensure electricity remains affordable, reliable and sustainable.

Policy – The Ministry of Energy

Sets overall policies for the electricity sector.
Learn more about Ontario’s Ministry of Energy

Regulation and Consumer Protection – The Ontario Energy Board

Ensures that electricity customers are treated fairly and that sector participants fulfill their responsibilities. This includes licensing electricity companies, setting residential electricity rates and regulating how electricity companies operate.
Learn more about the Ontario Energy Board


Produce electricity to provide Ontario’s energy needs. Ontario has one of the cleanest electricity grids in the world, which is made up of a diverse range of resources, including hydro, natural gas, nuclear, solar, wind and bio-fuels.
Learn more about Ontario’s electricity supply mix


Build and maintain Ontario’s high-voltage transmission lines that transport electricity from generators to local distributors. Transmitters also maintain Ontario’s grid connections with Manitoba, Quebec and the U.S., allowing electricity to be imported and exported.

Local Hydro Companies, or Local Distribution Companies (LDCs)

Deliver electricity directly to households and businesses in your community. There are dozens of LDCs across Ontario that are available to answer questions about your monthly electricity bill, power disruptions in your area and local electricity related programs and projects.
Find your Local Distribution Company

Supply Mix and Generation | Ontario’s Electricity Grid

Ontario has a clean electricity grid made up of multiple different resources that each play an important role in keeping electricity reliable, affordable and sustainable.