Transmission-Connected Generation
Transmission-connected generation refers to facilities that are connected to the high-voltage IESO-Controlled Grid, which include all lines over 50 kilovolts (kV), such as 115 kV, 230 kV, and 500 kV transmission lines. The low-voltage grid is operated by local distribution companies.
Real-time Supply Output
The current hourly output by fuel type reported on the homepage and the Power Data page represents the production values of transmission-connected generation. This real-time data comes from the hourly Generator Output and Capability report, that provides output levels from generators, registered as market participants, with capacities of 20 megawatts (MW) or greater.
Distribution-connected generation (also known as embedded generation) is not reported through the Generator Output and Capability report. More information can be found in the distribution-connected generation section.
Current Installed Capacity
Ontario’s supply mix has significantly changed over the last decade—wind, solar, bioenergy, waterpower, refurbished nuclear and natural gas-fired resources have replaced Ontario’s coal fleet. The current Reliability Outlook reports that Ontario's installed (transmission-connected) generation capacity totals 37,566 MW. The amount of generation actually available from day-to-day is dependent on current conditions, including facility outages (planned maintenance or unplanned).
| Year | Nuclear | Hydro | Gas/Oil | Wind | Biofuel | Solar |
|---|---|---|---|---|---|---|
|
2024 |
80 TWh 50.9% |
37.8 TWh 24.1% |
24.7 TWh 15.7% |
13.4 TWh 8.5% |
0.4 TWh <1% |
0.8 TWh <1% |
|
2023 |
79.3 TWh 53.2% |
37.4 TWh 25.1% |
19.1 TWh 12.8% |
12.2 TWh 8.2% |
0.4 TWh <1% |
0.7 TWh <1% |
|
2022 |
78.8 TWh 53.7% |
38.0 TWh 25.9% |
15.2 TWh 10.4% |
13.8 TWh 9.4% |
0.3 TWh <1% |
0.75 TWh <1% |
|
2021 |
83.0 TWh 58.2% |
34.2 TWh 24% |
12.2 TWh 8.6% |
12 TWh 8.4% |
0.4 TWh <1% |
0.75 TWh <1% |
|
2020 |
87.8 TWh 60% |
36.9 TWh 25% |
9.7 TWh 7% |
11.8 TWh 8% |
0.4 TWh <1% |
0.8 TWh <1% |
|
2019 |
90.4 TWh 61% |
36.4 TWh 25% |
9.5 TWh 6% |
11.0 TWh 7% |
0.4 TWh <1% |
0.7 TWh <1% |
| 2018 |
90.1 TWh 61% |
36.2 TWh 25% |
9.6 TWh 6% |
10.7 TWh 7% |
0.4 TWh <1% |
0.6 TWh <1% |
| 2017 |
90.6 TWh 63% |
37.7 TWh 26% |
5.9 TWh 4% |
9.2 TWh 6% |
0.4 TWh <1% |
0.5 TWh <1% |
| 2016 |
91.7 TWh 61% |
35.7 TWh 24% |
12.7 TWh 9% |
9.3 TWh 6% |
0.49 TWh <1% |
0.46 TWh <1% |
 |
Amherst Island Wind | 74 MW |
| |
North Kent Wind 1 | 99.1 MW |
|
Belle River Wind | 100 MW |
 |
Namewaminikan Hydro | 10 MW |
 |
Thunder Bay Generating Station | -153 MW |
| |
Fort Frances Unit | -47 MW |
 |
Niagara Region Wind Farm | 230 MW |
| |
Peter Sutherland Senior Generating Station | 29 MW |
 |
South Gate Solar | 50 MW |
|
Windsor Solar | 50 MW |
 |
Greenfield South (Green Electron Power) | 334 MW |
|
Bow Lake Phase 1 and 2b | 60 MW |
 |
Grand Bend Wind Farm (Zurich) | 99 MW |
 |
Northland Power Solar Empire | 10 MW |
|
Northland Power Solar Abitibi | 10 MW |
|
Northland Power Solar Martin's Meadow | 10 MW |
|
Northland Power Solar Long Lake | 10 MW |
|
Grand Valley Wind Farms (Phase 3) | 40 MW |
|
Armow Wind | 180 MW |
|
Cedar Point Wind Power Project Phase II | 100 MW |
|
Thunder Bay Unit Converted to Burn Biomass | 153 MW |
|
Grand Renewable Energy Park (Grand SF) | 100 MW |
|
Jericho Wind Energy Centre | 150 MW |
| |
Adelaide Wind Power (Landon) | 40 MW |
|
Dufferin Wind Power (Shannon) | 91.3 MW |
|
Goshen Wind Energy Center | 102 MW |
|
Grand Renewable Energy Park (Grand WF) | 149 MW |
|
Goulais Wind Farm | 25 MW |
|
K2 Wind Project | 270 MW |
| |
Bornish Wind Energy Centre | 74 MW |
|
Adelaide Wind Energy Centre | 60 MW |
 |
Nuclear Upgrade at the Bruce Power Plant | 31 MW |
|
Kingston Solar Project | 100 MW |
 |
Thunder Bay Condensing Turbine Project | 40 MW |
|
Old Smoky Falls Units | -53 MW |
 |
Three new hydraulic units at Smoky Falls | 264 MW |
|
Third hydraulic unit at Kipling Generating Station | 79 MW |
| |
Erieau Wind | 99 MW |
|
Port Dover and Nanticoke Wind Project | 105 MW |
| |
Third Unit at Little Long | 67 MW |
 |
Liskeard 1,3 and 4 | 30 MW |
 |
Thunder Bay Units 2 and 3 | -306 MW |
| |
New Third Unit at Harmon | 78 MW |
|
South Kent Wind (Railbed) | 270 MW |
|
McLean's Mountain Wind Farm | 60 MW |
|
Bluewater Wind Energy Centre (Blake) | 60 MW |
|
East Lake St. Clair | 99 MW |
| |
Summerhaven Wind Energy Centre | 125 MW |
 |
Atikokan Converted to burn Biomass |
|
Comber Wind | 166 MW |
|
Pointe Aux Roches Wind Farm (Paroches) | 49 MW |
 |
Lambton Coal Shutdown | -1,016 MW |
| |
Nanticoke Coal Shutdown | -1,985 MW |
| |
Greenwich Wind Farm | 99 MW |
|
Gosfield Wind | 50 MW |
|
Raleigh Wind Energy Centre (Dillon) | 78 MW |
| |
Nanticoke Units 1 and 2 shutdown | -980 MW |
 |
Thorold cogeneration | 287 MW |
|
Halton Hills Generating Station | 705 MW |
| |
Nanticoke and Lambton unit shutdowns | -1,950 MW |
|
Conversion of Fort Frances to biofuel | 47 MW |
| |
Talbot Wind Farm (Spence) | 99 MW |
|
Kruger Energy Chatham Wind (Portalma T3) | 101 MW |
| |
St. Claire Energy Centre | 678 MW |
| |
Portlands Energy Centre (Combined Cycle) | 246 MW |
|
Goreway Station | 942 MW |
 |
Beck Unit 7 conversion | 69 MW |
|
Beck 2 upgrades | 68 MW |
| |
Enbridge Ontario Wind Farm (Underwood) | 182 MW |
 |
Wolfe Island Wind Farm | 198 MW |
 |
East Windsor Cogeneration | 100 MW |
| |
Portlands Energy Centre (Simple Cycle) | 394 MW |
|
Greenfield Energy Centre | 1,153 MW |
 |
Umbata Falls | 24 MW |
|
Kruger Energy Port Alma (T1) Wind Project (Portalma T1) | 101 MW |
|
Melancthon II (Amaranth) | 132 MW |
