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Supply Overview

​Ontario's supply mix landscape has significantly changed since the market opened in 2002. More than 12,400 megawatts (MW) of new supply including renewable resources have been connected, while infrastructure such as nuclear units is undergoing renewal. Coal generation in Ontario is close to being phased out completely and a new fleet of gas-fired facilities have emerged.


Current Supply Mix

The amount of generation actually available at any one time is dependent on facility outages (planned maintenance or unplanned) and the capacity factor of certain forms of supply.

​Ontario's installed generation capacity totals 32,829 MW which includes*:

Nuclear

​Nuclear:

​12,947 MW or 39.4%

Gas

​Gas/Oil:

​9,920 MW or 30.2%

Gas

Hydro:

​8,014 MW or 24.4%

Wind

​Wind:

​1,824 MW or 5.6%

Other

Other (wood waste, biogas, etc): 124 MW or 0.4%

 

Installed-Capacity-by-Fuel-Type-Jan-14--for-Power-Data_V2.png

*Generating resources as of April 15, 2014. Note that these figures do not include generators that operate within local distribution service areas, except for those that participate in the IESO-administered market. ​


Energy Output By Fuel Type

The pie chart below details the percentage of total energy produced in 2013, categorized by each fuel type. Compare this with output from previous years in the table to the right.

  Energy-Output-by-Fuel-Type-2013_for-web-v2.png   

Due to rounding, percentages may not add to 100.

 

 

Year

Nuclear

Hydro

Coal

Gas

Wind

Other

​2013​91.1 TWh
59.2%
​36.1 TWh
23.4%
​3.2 TWh

2.1%

​17.1 TWh

11.1%

​5.2 TWh

3.4%

​1.3 TWh

0.8%

2012

85.6 TWh
56.4%

33.8 TWh
22.3%

4.3 TWh
2.8%

22.2 TWh
14.6%

4.6 TWh
3.0%

1.3 TWh
0.8%

2011

85.3 TWh
56.9%

33.3 TWh
22.2%

4.1 TWh
2.7%

22.0 TWh
14.7%

3.9 TWh
2.6%

1.2 TWh
0.8%

2010

82.9 TWh
55.0%

30.7 TWh
20.4%

12.6 TWh
8.3%

20.5 TWh
13.6%

2.8 TWh
1.9%

1.3 TWh
0.8%

2009

82.5 TWh
55.2%

38.1 TWh
25.5%

9.8 TWh
6.6%

15.4 TWh
10.3%

2.3 TWh
1.6%

1.2 TWh
0.8%

2008

84.4 TWh
53.0%

38.3 TWh
24.1%

23.2 TWh
14.5%

11.0 TWh
6.9%

1.4 TWh
0.9%

1.0 TWh
0.6%

Ontario's Changing Supply Mix

​Ontario's electricity sector is going through a process of renewal — with the replacement of aging infrastructure and the transition to a more sustainable energy supply mix. Here's an overview of new or refurbished generation projects of 20 MW or more that have been commissioned as well as units that have been retired since 2002. Also included below is a list of new generation scheduled to come in service within the next 18 months (as of January 15, 2014; updated quarterly, based on the 18-Month Outlook).

Ontario's Electricity System map on the right, provides an overview of generation facilities over 20 MW and connected to the high voltage transmission grid.

​New and Retired Generation Since the IESO Market Opened in May 2002

2014 +
2013 +
2012 +
​2011 +
​2010 +
​2009 +
​2008 +
​2007 +
​2006 +
​2005 +
​2004 +
​2003 +

Note:

An asterisk (*) denotes the project has achieved commercial operation  but has not met all the commissioning requirements of the IESO.

Some facilities have been combined in name (resulting in an increase in capacity) or have changed their name from when being first registered into the system. The list above is the original record when they first commissioned onto the system. The Generator Output and Capability Report includes a list of all facilities over 20 MW and their current output connected to the IESO-controlled grid.

Committed and Contracted Generation Resources

​2014 Q2 +
​2014 Q3 +
​2014 Q4 +
​2015 Q1 +
​2015 Q2 +

 


​Imports and Exports

The fact that Ontario is interconnected with neighbouring provinces and states improves electricity reliability. Ontario's high-voltage transmission grid is connected to Manitoba, Quebec, New York, Michigan and Minnesota.

Year

Imports (TWh)

Exports (TWh)

​2013​4.9​18.3
20124.714.6
20113.912.9
20106.415.2
20094.815.1
200811.322.2
20077.212.3
20066.211.4
200511.010.2
20049.89.5
200310.46.3
20027.13.9
20014.34.1
20005.15.5
19996.04.0
19986.03.0
19973.86.4

​Download Data (.csv)

For a complete listing of reports, see Data Directory