Ontario Demand Peaks

Customers with an average peak demand of over 5 MW (Class A Customers) have their Global Adjustment costs charged based on the percentage that their demand contributes to the overall system demand during the five peak hours of a defined base period. The five peak hours must occur on different days for this settlement calculation.

The information on this page will help consumers to track current daily system peaks as well as look at future forecast demand information. The forecast information on this page is currently available in other reports on the IESO website. Note that the IESO presents data on this page based on EST or market time which does not adjust for daylight savings time.

Ontario Demand information listed below is published in real-time to www.ieso.ca/demand. Allocated Quantity of Energy Withdrawn (AQEW) represents more precise, verified peak system demands for the five peak hours per Ontario Government Regulation 398/10. This is published 20 business days after the trade date. Only the highest demand hour of the day is used in each table. This information will help determine when the peak hours occurred, but should not be used for settlement purposes.

Top Ten Ontario Demand Peaks from May 1, 2012 to April 30, 2013
Rank	Date	Hour Ending	Ontario Demand (MW)	AQEW (MW)*
1	May 15, 2012	17	17,097
2	May 3, 2012	20	17,080
3	May 14, 2012	20	16,896
4	May 16, 2012	21	16,759
5	May 7, 2012	20	16,656
6	May 4, 2012	11	16,588
7	May 1, 2012	20	16,585
8	May 2, 2012	20	16,546
9	May 17, 2012	21	16,431
10	May 8, 2012	17	16,421

This table lists the current top ten days and what the hourly peak demand in Ontario was for that day. When available, the IESO will publish the corresponding AQEW value in the right column of this table.

*AQEW information up-to-date as of April 20, 2012.

Top Five AQEW Peaks from May 1, 2012 to April 30, 2013
Rank	Date	Hour Ending	AQEW (MW)

Allocated Quantity of Energy Withdrawn (AQEW) is not available in another part of the website. This table represents the current top five peak hours and will change as higher peaks in the period are attained.

Forecast Data

Forecast Demand for the Next Three Hours
Hour Ending	Ontario Demand (MW)
20	15,637
21	15,865
22	14,979

This table displays the pre-dispatch Ontario demand for the next 3 hours. It is updated hourly throughout the day. Complete pre-dispatch reports are available at: http://ieso.ca/imoweb/marketdata/ssrsaa.asp.

Forecasted Peak Demand for the Next Six Days
Date	Hour Ending	Maximum Forecasted Ontario Demand (MW)	Link
May 19, 2012	21	15,171	HTML
May 20, 2012	21	15,637	HTML
May 21, 2012	20	14,992	HTML
May 22, 2012	17	16,447	HTML
May 23, 2012	17	16,236	HTML
May 24, 2012	17	16,778	HTML

This table contains the forecasted peak hour for each of the next 6 days. The data is collected from the Daily Security and Adequacy Assessment reports. It is updated at 12:00 a.m. EST each day.

Glossary

AQEW is the figure used to determine the five peak hours for the Global Adjustment calculation for Class A consumers. It represents the total Allocated Quantity of Energy Withdrawn in the hour, net of certain load quantities as set out in Ontario Government Regulation 398/10. AQEW is available 20 business days after the trade date.

Hour Ending denotes the time when an hour ends, e.g. HE 14 represents the time period 1:00-2:00 p.m. EST.

Ontario Demand is available on an hour-to-hour basis from the IESO website. Because it is published in real-time and has only been verified to a rudimentary degree, it is not the figure used to determine peak hours.

Note: All data on this page is displayed for informational purposes only. System conditions can change between pre-dispatch and actual data resulting in differences. The IESO makes no representations, express or implied, and disclaims any and all liability as to the accuracy of this data.