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Ontario Demand Peaks - Archive

Customers with an average peak demand of over 5 MW 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 account for the daily system peaks recorded from May 1, 2012 until April 30, 2013.

Ontario Demand information listed below was published in real-time on the Power Data​ page. Allocated Quantity of Energy Withdrawn (AQEW) represents more precise, verified peak system demands for the five peak hours. 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, 2015 to April 30, 2016 ​

Rank

Date

Hour Ending

Ontario Demand (MW)

AQEW (MW)*

1

July 28, 2015

17

22,516

22,016

2

July 29, 2015

17

22,472

21,900

3

August 17, 2015

17

22,383

21,882

4

September 02, 2015

17

22,063

21,394

5

September 08, 2015

18

21,923

21,227

6

July 27, 2015

18

21,920

21,562

7

September 03, 2015

13

21,889

21,348

8

September 07, 2015

17

21,883

21,206

9

August 19, 2015

17

21,629

21,158

10

September 01, 2015

20

21,366

20,815

Top Ten Ontario Demand Peaks from May 1, 2014 to April 30, 2015 ​

Rank

Date

Hour Ending

Ontario Demand (MW)

AQEW (MW)*

1

January 07, 2015

18

21,814

21,038

2

February 19, 2015

20

21,494

20,976

3

August 26, 2014

17

21,363

20,967

4

July 22, 2014

17

21,300

20,744

5

February 23, 2015

19

21,272

20,774

6

February 24, 2015

20

21,127

20,635

7

September 05, 2014

17

21,123

20,831

8

January 13, 2015

19

21,028

20,589

9

February 12, 2015

19

21,018

20,510

10

January 05, 2015

19

20,999

20,392

 

Top Ten Ontario Demand Peaks from May 1, 2013 to April 30, 2014 ​

Rank

Date

Hour Ending

Ontario Demand (MW)

AQEW (MW)*

1

July 17, 2013

14

24,927

24,094

2

July 16, 2013

17

24,224

23,551

3

July 18, 2013

12

24,139

23,397

4

July 19, 2013

14

23,875

23,234

5

July 15, 2013

17

23,557

23,107

6

August 29, 2013

16

22,833

22,279

7

January 7, 2014

19

22,774

22,182

8

January 22, 2014

19

22,737

22,127

9

September 10, 2013

20

22,682

22,021

10

September 11, 2013

16

22,670

22,065

 

Top Ten Ontario Demand Peaks from May 1, 2012 to April 30, 2013 ​

Rank

Date

Hour Ending

Ontario Demand (MW)

AQEW (MW)*

1

July 17, 2012

16

24,636

23,954

2

June 20, 2012

16

24,107

23,239

3

July 4, 2012

17

23,910

23,355

4

June 21, 2012

16

23,801

22,986

5

July 23, 2012

14

23,745

23,060

6

July 6, 2012

16

23,612

22,991

7

July 16, 2012

16

23,392

22,750

8

August 3, 2012

17

23,188

22,544

9

June 19, 2012

16

23,012

22,363

10

July 13, 2012

15

22,927

22,322


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.