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Market Manual 5.5: Physical Market Settlement Statements

Recent Changes

The Ontario government has expanded the Industrial Conservation Initiative program (previously Global Adjustment Allocation) to include eligible customers with monthly peak demand of greater than three megawatts. For more information, see Changes to Class A Eligibility.

Also in this Section

Global Adjustment for Class A

​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.

Base Period

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.

Base Period (Peak-setting Period)

Adjustment Period (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)

Visit Global Adjustment for Class B to see  Estimated and Actual Global Adjustment rates.

See the Global Adjustment main page for a breakdown of the GA components.

Coincident Peaks

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.



Hour Ending

Allocated Quantity of Energy Withdrawn (MW)

Embedded Generation (MW)

Total (MW)*

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.

As of May 28, 2016
RankDateHour EndingOntario Demand (MW)Corresponding AQEW (MW)
1May 27, 20161719,681
2May 28, 20161719,338
3May 25, 20162018,320
4May 26, 20161918,181
5May 24, 20161917,397
6May 02, 20162116,117
7May 19, 20162115,949
8May 12, 20162015,884
9May 04, 20162015,884
10May 03, 20162015,855

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

​Rank ​Date ​Hour Ending
​1​July 28, 2015
​2​July 29, 2015
​3​August 17, 2015
​4​July 27, 2015
​5​September 3, 2015
​6​September 2, 2015
​7​September 8, 2015
​8​September 7, 2015
​9August 19, 2015
​10​September 1, 2015

Note: This Top Ten AQEW Peaks table will be updated as necessary.

Forecasting Demand

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: http://reports.ieso.ca/public/SSR/ 

As of 8:00 PM EST May 28, 2016
Hour EndingOntario 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

As of 6:00 PM EST May 28, 2016
DateHour EndingMaximum Forecasted Ontario Demand (MW)Link
May 29, 20161718,828System Status Report
May 30, 20161719,088System Status Report
May 31, 20161916,572System Status Report
June 01, 20162117,269System Status Report
June 02, 20161717,567System Status Report
June 03, 20161415,973System Status Report