Each Class A customer’s portion of the province-wide total GA cost is calculated using their Peak Demand Factor.
After the IESO establishes the top five demand peaks for a base period, the IESO and LDCs then look at each Class A customer’s consumption during those five hours (coincident peaks) to calculate their corresponding portion of peak demand.
For more detailed information, see the
Industrial Conservation Initiative Backgrounder.
Class A customers are assessed their portion of GA costs based on the percentage that their peak demand contributes to the top five system coincident peaks during a predetermined base period. For example, if a Class A customer is assessed to be responsible for one per cent of Ontario's coincident peak demand for the five highest hours of a set base period, they will be charged for one per cent of total GA costs through the next adjustment, or billing period.
May 1, 2014 to April 30, 2015
July 1, 2015 to June 30, 2016
May 1, 2015 to April 30, 2016
July 1, 2016 to June 30, 2017
May 1, 2016 to April 30, 2017
July 1, 2017 to June 30, 2018
May 1, (Year X) to April 30, (Year X+1)
July 1, (Year X+1) to June 30, (Year X+2)
Top 5 Peaks: Hours & System-Wide Consumption
The table below shows the final peak hours and the corresponding adjusted demand for the past base period. Embedded generation is included, as it represents Ontario demand that was met through local generation.
July 28, 2015
July 29, 2015
August 17, 2015
July 27, 2015
September 3, 2015
*The value in the Total (MW) column is the number used to calculate a customer's Peak Demand Factor.
Calculating Your Peak Demand Factor
After the IESO establishes the final top five Ontario demand peaks using adjusted AQEW for a base period, the IESO and LDCs then look at each Class A customer's demand during those five hours (coincident peaks) to calculate their corresponding portion of peak demand. This portion is called a peak demand factor and is used to determine a customer's allocation of costs for the adjustment or billing period.
A customer's consumption during the top 5 demand peak hours (MWh/h)|
Sum of Top 5 System-Wide Consumption Peaks
Peak Demand Factor
How Class A Customers are Charged GA
The Class A customer's Peak Demand Factor is used to calculate monthly GA charges during the adjustment or billing period. This is done by multiplying the monthly, Ontario-wide total GA costs by the customer's Peak Demand Factor.
Your Peak Demand Factor from
Your GA charge for