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Electricity Facts

Electricity Supply Mix

In Ontario, electricity is produced from a number of sources. The Electricity Supply Mix*, for an electricity product, is the combination of power sources used to generate the product.

The following chart shows the combination of electricity sources used to generate the electricity consumed in Ontario in 2017.

 Ontario's Electricity Supply Mix 2017

*Includes both transmission and distribution-connected/embedded generation

**Includes duel-fuelled facilities that are predominantly natural gas (e.g. Lennox Generating Station)

Note: Figures may not add to 100% due to rounding.

Fuel Source % of Total Supply  


Hydro 25.6%
Alternative power sources (wind, biofuel, solar) 9.8%

Natural Gas




2017 information courtesy the Ontario Energy Board.

For a near real-time supply mix breakdown, please visit the Independent Electricity System Operator