Changes to the Global Adjustment

The Global Adjustment (GA) is the difference between the total payments made to certain contracted or regulated generators/demand management projects, and market revenues.

Starting January 1, 2011, customers with an average peak demand over five megawatts (MW) during a defined Base Period will be considered ‘Class A’ customers.  The monthly GA amounts for these customers will be based on their coincident peak demands. This change is a result of Regulation 398/10 amending Regulation 429/04.

GA amounts for Class A customers will now be based on the percentage that their peak demand contributes to overall system demand during the five peak hours of a defined Base Period. For example, if their demand is assessed to be responsible for one per cent of peak demand during the five peak hours of the Base Period, they will be charged one per cent of the total monthly global adjustment costs throughout the subsequent billing period (called Adjustment Period).

The IESO has worked extensively to reach out to large electricity consumers affected by this regulation. For more information, please see the IESO’s backgrounder, the IESO’s presentation (with sample session agenda), or contact IESO Customer Relations at 1-888-448-7777.

All other consumers are considered Class B and will continue to pay for the Global Adjustment based on their total monthly consumption.

Base Period (Peak-setting period)	Adjustment Period (Billing period)
May 1, 2010 to October 31, 2010	January 1, 2011 to June 30, 2011
May 1, 2010 to April 30, 2011	July 1, 2011 to June 30, 2012
May 1, 2011 to April 30, 2012	July 1, 2012 to June 30, 2013
May 1, (Year X) to April 30, (Year X+1)	July 1, (Year X+1) to June 30, (Year X+2)

Coincident Peaks (Base Period: May 1, 2011 to April 30, 2012)

Date Hour Ending Net Ontario Load (MW) Embedded Generation (MW) Total (MW)* July 18, 2011 16 23,151.788 273.632 23,425.420 July 19, 2011 17 22,517.184 305.815 22,822.999 July 20, 2011 17 23,720.265 357.910 24,078.175 July 21, 2011 16 24,706.556 447.961 25,154.517 July 22, 2011 12 22,401.165 352.281 22,753.446

Coincident Peaks (Base Period: May 1, 2010 to April 30, 2011)

Date Hour Ending Net Ontario Load (MW) Embedded Generation (MW) Total** (MW)* July 6, 2010 16 23,914.747 296.457 24,211.204 July 7, 2010 16 24,456.468 267.472 24,723.940 July 8, 2010 15 24,432.434 258.664 24,691.098 August 31, 2010 16 24,010.299 309.307 24,319.606 September 1, 2010 16 23,822.773 344.161 24,166.934

Coincident Peaks (Base Period: May 1 to October 31, 2010)

Date Hour Ending Net Ontario Load (MW) Embedded Generation (MW) Total (MW)* July 6, 2010 16 23,914.747 287.757 24,202.504 July 7, 2010 16 24,456.468 264.120 24,720.588 July 8, 2010 15 24,432.434 253.205 24,685.639 August 31, 2010 16 24,010.299 304.322 24,314.621 September 1, 2010 16 23,822.773 338.726 24,161.499

*The value in the Total (MW) column is the number used to calculate a customer’s Peak Demand Factor.
**The total MW value for each date is different between the two base periods because the IESO received updated embedded generation numbers in the spring of 2011.