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 2024, which was published by the OEB on June 3, 2025.
Ontario’s System-Wide Electricity Supply Mix: 2024 Data
Electricity Facts
Electricity sources
Ontario’s Electricity Mix
Nuclear Energy
48.5%
Water Power
23.4%
Natural Gas*/Oil/Other
16.6%
Wind
9.0%
Solar
2.2%
Bioenergy
0.4%
* Includes Lennox, dual fuel (natural gas / bioenergy) and non-contracted emitting generation consistent with IESO.
Notes: Figures may not add to 100% due to rounding. Figures do not account for the sale and retirement of Clean Energy Credits (CECs).
Download Ontario’s System-Wide Electricity Supply Mix: 2024 Data (191KB PDF)
For more information, please contact the Ontario Energy Board or the Independent Electricity System Operator.