The Global Adjustment (GA) rate for Class A customers varies individually depending on their energy use during peak hours. This Class A rate, known as the Industrial Conservation Initiative (ICI), encourages large users to shift their energy use away from system-wide peaks. Participation in the ICI includes all customers with an average hourly peak demand over five megawatts and certain classes of customers with peak demands greater than 3 MW but less 5 MW. Read more about Class A Eligibility.
Base Period - The 12 months during which customer peak energy is assessed to determine their percentage of coincident peak energy use
Coincident Peaks - The top five Ontario demand peaks for the previous base periods
The Peak Tracker - The current top 10 demand peaks for the current base period, updated in real-time
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 predetemined 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)
Under the coincident peak model, the IESO establishes the top five Ontario demand peaks for each base period. Then the IESO and LDCs look at each Class A customer's demand during those five hours (also known as coincident peaks) to calculate their corresponding portion of peak demand. This proportion (called a peak demand factor) determines a customer's allocation for the next adjustment (or billing) period.
The five system coincident peak hours must occur on different days for this settlement calculation. The table below sets out these peak hours and the corresponding Ontario demand for previous base periods.
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.
Tracking Demand Peaks
IESO market and forecast data can help Class A customers monitor and anticipate daily system peaks. Note that the IESO presents data on this page using Eastern Standard Time (market time), which does not adjust for Eastern Daylight Saving Time (EDT).
Top Ten Ontario Demand Peaks from May 1, 2016 to April 30, 2017
This table lists the top ten daily peaks for the current base period. This chart is updated in real-time. Once it becomes available, the IESO will publish the corresponding Allocated Quantity of Energy Withdrawn (AQEW) value in the right column of this table. AQEW represents more precise, verified peak system demands for the five peak hours and is published 20 business days after the trade date. Only the highest demand hour of the day is used in each table.
|Rank||Date||Hour Ending||Ontario Demand (MW)||Corresponding AQEW (MW)|
For historical demand peaks, see
Ontario Demand Peaks Archive.
Top Ten AQEW Demand Peaks from May 1, 2015 to April 30, 2016
This table ranks the verified Ontario daily demand peaks (AQEW)
for the current Industrial Conservation Initiative base period so far.
AQEW represents more precise, verified peak system demands. This ranking is used to determine the top five peaks for settling Global Adjustment for Class A customers. Only the highest verified demand hour of the day is used.
In some cases, these Top Ten AQEW Peaks may differ from the above peaks.
As of April 30, 2016
|1||July 28, 2015||17||22,016|
|2||July 29, 2015||17||21,900|
|3||August 17, 2015||17||21,882|
|4||July 27, 2015||18||21,562|
|5||September 3, 2015||14||21,429|
|6||September 2, 2015||17||21,394|
|7||September 8, 2015||17||21,369|
|8||September 7, 2015||17||21,206|
|9||August 19, 2015||17||21,158|
|10||September 1, 2015||17||20,873|
Note: This Top Ten AQEW Peaks table will be updated as necessary.
Forecasting Demand for the Next Three Hours
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:
8:00 PM EST May 28,
|Hour Ending||Ontario Demand (MW)|
This table contains the forecasted peak hour for each of the next six days. The data is collected from the
Daily Security and Adequacy Assessment reports. It is updated at 12:00 a.m. EST each day.
Forecasted Peak Demand for the Next Six Days
6:00 PM EST May 28,
|Date||Hour Ending||Maximum Forecasted Ontario Demand (MW)||Link|
2016||17||18,828||System Status Report|
2016||17||19,088||System Status Report|
2016||19||16,572||System Status Report|
2016||21||17,269||System Status Report|
2016||17||17,567||System Status Report|
2016||14||15,973||System Status Report|