In Ontario, electricity is produced from a number of sources. For a close to real-time supply mix breakdown, please visit the Independent Electricity System Operator website. 

Ontario's System-Wide Electricity Supply Mix 2021 (.PDF)

Ontario's system-wide Electricity Supply Mix in 2021
Electricity Sources                         Ontario Electricity Mix
Nuclear Energy 55.3%
Water Power 23.3%
Natural Gas  8.1%   Includes Lennox and dual fuel (natural gas, bioenergy)

Wind

 9.0%
Solar PV 2.5%
Bioenergy 0.5%   IESO embedded generation combines biomass and gas

Non-Contracted

 0.9%   Variety of fuel types not categorized by IESO