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There is approximately 35,781 MW of installed generation in Ontario's electricity market.
Total daily generator availability is posted on the IESO website.
The amount of generation available is dependent on outages on part or all of a generating unit.
Here's an overview of Ontario's supply situation:
Supply Outlook
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.
The IESO's Ontario Reliability Outlook identifies a number of new projects in various stages of development to address this need.
The latest issue of the Ontario Reliability Outlook points to a positive outlook for Ontario’s longer-term reliability picture, but indicates that going forward, the focus will need to shift to ensuring that both generation and transmission projects are implemented in time to meet needs. The IESO will be working with the Ontario Power Authority to address the integration and operational challenges of a complex and changing generation mix.
Imports and Exports
Ontario is capable of importing or exporting approximately 4,600 MW at any one time, depending on system conditions.
The transmission grid is connected to Manitoba, Quebec, New York, Michigan and Minnesota.
| Year |
Imports (TWh) |
Exports (TWh) |
Net Imports (TWh) |
| 2009 |
4.8 |
15.1 |
-10.3 |
| 2008 |
11.3 |
22.2 |
-10.9 |
| 2007 |
7.2 |
12.3 |
-5.1 |
| 2006 |
6.2 |
11.4 |
-5.2 |
| 2005 |
11.0 |
10.2 |
0.8 |
| 2004 |
9.8 |
9.5 |
0.3 |
| 2003 |
10.4 |
6.3 |
4.1 |
| 2002 |
7.1 |
3.9 |
3.2 |
| 2001 |
4.3 |
4.1 |
0.2 |
| 2000 |
5.1 |
5.5 |
-0.4 |
| 1999 |
6 |
4 |
2 |
| 1998 |
6 |
3 |
3 |
| 1997 |
3.8 |
6.4 |
-2.6 |
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Existing Installed Generation
Ontario's existing installed generation capacity includes nuclear, coal, oil, gas, hydroelectric, wood and waste-fuelled generation, which results in a total installed capacity of approximately 35,781 MW.
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Where to Find More Information About Supply
- The Ontario Reliability Outlook reports on projects underway to meet Ontario's future electricity needs.
- The Quarterly Power Outlook provides a summary of demand forecasts and generation availability over the next three months.
- More detailed 18-Month and 10-Year Outlooks are available on the Forecasts page in the "Inside the Market" section.
- Information on available generation, imports and exports are available from the Market Summaries page of the "Inside the Market" section.
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