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Ontario’s System-Wide Electricity Supply Mix: 2021 Data

Oct 4, 2022

Where did Ontario’s 2021 electricity come from?

 2021 Electricity Facts
Electricity sources Ontario’s Electricity Mix
Nuclear Energy 55.3%
Water Power 23.3%
Natural Gas* 8.1%
Wind 9.0%
Solar PV 2.5%
Bioenergy** 0.5%
Non-Contracted*** 1.2%
*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:
1.Figures may not add to 100% due to rounding.
2.Figures do not account for the sale and retirement of Clean Energy Credits(CECs).

 

Under O. Reg. 416/99 the Ministry of Energy is responsible for providing Ontario’s electricity supply mix data for electricity suppliers. The following table discloses the system-wide electricity supply mix data for 2021. This data must be used by electricity suppliers for the purposes of complying with the disclosure obligations of O. Reg. 416/99 and the Directive. This data should be considered current until further notice.
To fulfill the requirements of the Regulation, the OEB presents the information in percentages. To support the changes the IESO has made to the presentation of their distribution-connected data, the supply mix data in the table below is also presented in Terawatt-hours (TWh).

 

2021 Electricity Facts
Ontario’s Electricity Mix(System-Wide Generation in terawatt-hour – TWh)
Electricity Source Tx-Connected (direct) Dx-Connected (embedded) Total
Nuclear 83.0 83.0
Water Power 34.2 0.8 35.0
Natural Gas* 12.2 12.2
Wind 12.0 1.5 13.5
Solar PV 0.8 3.0 3.7
Bioenergy** 0.4 0.3 0.7
Non-Contracted*** 0.01 1.8 1.9
Total 142.5 7.5 150.0
* 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:
1. Components may not sum to the total due to rounding.
2. Figures do not account for the sale and retirement of Clean Energy Credits (CECs).