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Electricity Demand Records
The winter peak for electricity demand set on December 20, 2004 was 24,979 MW.
The summer peak for electricity demand set on August 1, 2006 was 27,005 MW.
Forecasting Peak Electricity Demand
Electricity supply and demand must be in balance every minute of the day.
The IESO must forecast peak demand to ensure that generation will be available to meet the peak.
Peak Demand Forecasts
| Season |
Seasonal Normal
Weather Peak (MW) |
Extreme Weather
Peak (MW) |
| Winter 2009-10 |
22,717 |
23,883 |
| Summer 2010 |
23,608 |
25,806 |
| Winter 2010-11 |
22,447 |
23,527 |
18-Month Outlook, November 17, 2009
Demand Patterns Throughout the Day
Electricity demand is primarily influenced by weather, hours of daylight, business hours, school holidays and consumption patterns as people arrive home from work.
Typically, demand peaks between 4 p.m. and 7 p.m. everyday.
Demand in the middle of the night can be as low as 12,000 - 13,000 MW and can rise by as much as 10,000 MW later the same day.
Total Annual Ontario Energy Demand
| Year |
Total (TWh) |
Increase Over
Previous Year |
| 2009 |
139 |
-6.1% |
| 2008 |
148 |
-2.3% |
| 2007 |
152 |
0.7% |
| 2006 |
151 |
-3.8% |
| 2005 |
157 |
2.3% |
| 2004 |
153 |
1.1% |
| 2003 |
152 |
-0.7% |
| 2002 |
153 |
4.1% |
| 2001 |
147 |
0% |
| 2000 |
147 |
2.1% |
| 1999 |
144 |
2.9% |
| 1998 |
140 |
1.4% |
| 1997 |
138 |
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Average Electricity Demand in Selected Ontario Communities
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| Toronto: | |
3,900 MW |
| Mississauga: |
1,240 MW |
| Brampton: |
610 MW |
| Windsor: |
430 MW |
| Guelph: |
240 MW |
| Thunder Bay: | 125 MW |
| Stratford: |
94 MW |
| Orillia: |
49 MW |
| Kenora: |
18 MW |
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Where to Find More Information About Ontario Demand
- Up-to-date demand information is available on the Demand and Price page.
- The Monthly Market Update provides demand information for the past month.
- Detailed daily, weekly and monthly market summaries are available on the Market Summaries page of the "Inside the Market" section.
- The seasonal Power Outlook provides a summary of demand forecasts and generation availability over the next three months.
- More detailed 18-Month and Ontario Reliability Outlooks are available on the Forecasts page in the "Inside the Market" section.
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