Ontario Electricity Supply Mix

The system-wide supply mix is the combination of power sources used to generate the electricity consumed in Ontario.

As a regulated distributor of electricity in Ontario, and like all other local distribution companies, Alectra Utilities is required by law (under Ontario Reg. 416/99) to disclose to our consumers information regarding the Ontario system-wide electricity supply mix. The Ontario Energy Board (OEB) directive requires that this information is distributed annually. Under the same regulation, the Ministry of Energy is responsible for providing Ontario’s electricity supply mix data to electricity distributors.

The table below discloses the system-wide electricity supply mix data for 2020, which was published by the OEB on March 22, 2021.

Ontario’s System-Wide Electricity Supply Mix: 2020 Data

Electricity Facts

Electricity sources

Ontario’s Electricity Mix

Nuclear Energy


Water Power


Natural Gas*




Solar PV






* Includes Lennox and dual fuel (natural gas/bioenergy) consistent with IESO.

** IESO’s embedded generation data set combines biomass and gas.

*** Non-Contracted represents a variety of fuel types that the IESO is unable to categorize due to a lack of information from Local Distribution Companies (LDCs).

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

Download Ontario’s System-Wide Electricity Supply Mix: 2020 Data (168 KB PDF)

For more information, please contact the Ontario Energy Board or the Independent Electricity System Operator.

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