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Supply Overview

​Ontario's supply mix landscape has significantly changed since the market opened in 2002. New supply including renewable resources has been connected, while infrastructure such as nuclear units is undergoing renewal. Coal generation in Ontario has been phased out and a new fleet of gas-fired facilities has 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.

Energy Output By Fuel Type - Monthly

The Generator Output by Fuel Type Monthly, year-to-date report contains monthly values of total output for market participants grouped by their primary fuel type. It includes facilities with installed capacity of less than 20 MW, but does not include embedded solar or wind generation

Previous Reports


Energy Output By Fuel Type - Yearly

Total yearly output (in MWh) since 2008 for all Ontario generators registered as a market participant, including those in commissioning, in the tables below.  

Year Nuclear ​Hydro ​Coal ​Gas/Oil  Wind ​Biofuel ​Solar
2015​92.3 TWh
60%
​36.3 TWh
24%
​n/a
n/a
​15.4 TWh
10%
​9.0 TWh
6%
​0.45 TWh
<1%
​0.25 TWh
<1%
2014​94.9 TWh
62%
​37.1 TWh
24%
​0.1 TWh
<1%
​14.8 TWh
10%
 ​6.8 TWh
 4%
​0.3 TWh
<1%
0.0185 TWh​
<1%
2013​91.1 TWh
59%
​36.1 TWh
23%
​3.2 TWh
2%
​18.2 TWh
12%
​ 5.2 TWh
 3%
​0.2 TWh
<1%
n/a​
n/a

Note: Fuel supply categories have changed here since 2012. The category Gas/Oil includes all dual-fuel facilities. The Solar category includes grid-connected facilities, which for 2014 was generation in the process of commissioning. Almost all solar generation in Ontario is currently connected to distribution systems.      

Year

Nuclear

Hydro

Coal

Gas

Wind

Other

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

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

2016 +
2015 +
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

​2016 Q3 +
​2016 Q4 +
​2017 Q1 +
​2017 Q3 +
​2017 Q4 +
              

IESO Contracted Generation

Quarterly Progress Report on Contracted Electricity Supply

Generation capacity under IESO contract in the Ontario transmission and distribution grid.

Note: The IESO's contracted generation capacity data differs from the Installed Capacity (Supply) pie graph above, which includes all market participant generators who supply or bid into the market.

IESO Active Generation Contract List

The IESO Active Generation Contract List provides the status of individual contracted electricity supply projects within different IESO procurement programs. The list is limited to generation facilities under contract to the IESO.

See the Quarterly Progress Report on Contracted Electricity Supply above for information on aggregated microFIT data.