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Electricity Data
Fourth Quarter 2019

October - December 2019


Transmission Grid-connected Generation Output (Q4)
Nuclear 23.1 TWh 61.9%
Hydro 8.7 TWh 23.5%
Wind 3.3 TWh 8.8%
Gas 2 TWh 5.3%
Biofuel <1 TWh 0.3%
Solar <1 TWh 0.2%
Conservation Savings (Q4)
Net Peak Demand Savings 61 MW
Net Energy Savings 418 GWh


Ontario Grid-Connected Peak Demand (Q4)

20,974 MW

Set on December 19, 2019, 6:00 pm EST

Ontario Grid-Connected Peak Demand (for 2019)

21,791 MW

Set in Q3 – July 29, 2019, 5:00 pm EST

Commodity Cost

Commodity Cost (Q4) – Class A (¢/kWh)
  Q4 YTD
Hourly Ontario Energy Price
(Unweighted average)
1.55 1.67
Global Adjustment
(Average, Class A)1
5.57 5.89
Total 7.12 7.56
Commodity Cost (Q4) – Class B (¢/kWh)
  Q4 YTD
Hourly Ontario Energy Price
(Weighted Average)
1.70 1.83
Global Adjustment
(Average, Class B)1
10.84 10.76
Total 12.54 12.59

1 Class A customers are large electricity consumers that pay Global Adjustment based on their proportion of energy use during the five hours of the year with the highest demand. All other customers are Class B.

Ontario’s Transmission Grid

Ontario's Power Grid map, View Full Map PDF

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