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Ontario Demand: Represents the energy supplied by the IESO-Administered Market to meet demand within Ontario. The IESO calculates Ontario Demand by subtracting scheduled exports from Total Market Demand. It is also equal to the sum of all loads (consumption) within Ontario supplied from the market, plus all line losses incurred on the IESO-controlled grid.

Market Demand: Represents the total energy supplied by the IESO-Administered Market. The IESO calculates Market Demand by summing all output from generators registered in the market plus all scheduled imports to the province. It is also equal to the sum of all load supplied from the Market plus exports from the province, plus all line losses incurred on the IESO-controlled grid.

Select Recent and Historical Reports: Click the links below to go to the latest version of select reports within the IESO Public Reports Site (.xml) and historical reports (.csv). IESO Public Reports contain a day or hour`s worth of data and historical reports provide data from 2002 to the present. For more information, the Data Directory provides  a listing and explanation of all reports below as well as all other IESO reports.

Demand


Supply


Price


 

Recent Reports



Historical Reports

Demand Demand Inforamtion

Demand

Ontario Demand – Hourly and 5-Minute: Represents the energy supplied by the IESO-Administered Market to meet demand within Ontario. The IESO calculates Ontario Demand by subtracting scheduled exports from Total Market Demand. It is also equal to the sum of all loads (consumption) within Ontario supplied from the market, plus all line losses incurred on the IESO-controlled grid.

Market Demand – Hourly and 5 Minute: Represents the total energy supplied by the IESO-Administered Market. The IESO calculates Market Demand by summing all output from generators registered in the market plus all scheduled imports to the province. It is also equal to the sum of all load supplied from the Market plus exports from the province, plus all line losses incurred on the IESO-controlled grid.

Today’s Projected Peak (at time): Represents the projected maximum amount of electricity required to meet peak Ontario and Market Demand for the day. Project demand can change throughout the day as the weather, system status and other factors that affect demand and supply also change. Where two intervals have the same projected peak, the earlier hour will be reported.

Today’s Projected Minimum (at time): Represents the lowest projected amount of electricity required to meet Ontario and Market Demand for the day.

Operating Reserve Requirement: Generation or load reduction capacity that the IESO can call upon on short notice to restore a balance between supply and demand, in the event of an unexpected demand increase or generator outage. The IESO purchases defined amounts of Operating Reserve from participants via three real-time markets.


Ontario Demand

13,175 MW
at 12:00 a.m. EST
October 21, 2014

down

5-minute Ontario Demand

12,691 MW
at 12:20 a.m. EST

down

Projected Ontario Demand (next hour)

12,802 MW
at 1:00 a.m. EST

down

Today's Projected Peak (Ontario)

18,163 MW
at 7:00 p.m. EST

Today's Projected Minimum (Ontario)

12,340 MW
at 3:00 a.m. EST

Market Demand

15,660 MW
at 12:00 a.m. EST

down

5-minute Market Demand

15,271 MW
at 12:20 a.m. EST

down

Today's Projected Peak (Market)

19,905 MW
at 7:00 p.m. EST

Today's Projected Minimum (Market)

14,104 MW
at 12:00 a.m. EST

Operating Reserve Requirement

1,418 MW
at 12:00 a.m. EST

nochange

Supply Supply Inforamtion

Supply

Generator Availability at Peak: Total amount of Ontario electricity generation available to produce energy at the predicted demand peak hour.

Generator Availability (at time): Total amount of Ontario electricity generation available to produce energy as per the previous hour’s output reports.

Output (by Fuel Type): Energy production by generators, 20 MW or greater, by fuel type (nuclear, hydro, gas, wind and other – mostly woodwaste), published 30 minutes following the dispatching hour.

Hourly Imports: Total amount of scheduled electricity imported into Ontario, from neighbouring jurisdictions – Michigan, Manitoba, Minnesota, Quebec and New York.

Hourly Exports: Total amount of scheduled electricity exported from Ontario to neighbouring jurisdictions - Michigan, Manitoba, Minnesota, Quebec and New York.


Generator Availability at Peak

24,328 MW

down

Generator Availability

23,978 MW
at 11:00 p.m. EST

down

Nuclear Output

10,689 MW
at 11:00 p.m. EST

up

Hydro Output

3,711 MW
at 11:00 p.m. EST

down

Gas Output

930 MW
at 11:00 p.m. EST

down

Wind Output

485 MW
at 11:00 p.m. EST

up

Other Output

181 MW
at 11:00 p.m. EST

down

Hourly Imports

184 MW
at 12:00 a.m. EST

down

Hourly Exports

2,547 MW
at 12:00 a.m. EST

up

Price Price Inforamtion

Price

Current Hourly Ontario Energy Price (HOEP): Charged to Local Distribution Companies and large customers who use more than 250,000 kWh a year. HOEP is also paid to self-scheduling generators. HOEP is the hourly arithmetic average of the uniform Ontario energy price determined for each of the 12, 5-minute dispatch intervals in a particular hour.

Market Clearing Price (5-Minute Price): Calculated every five minutes, 12 times an hour. This is the price paid to generators and charged to dispatchable load.

Global Adjustment: Accounts for the difference between the market price and the rates paid to regulated and contracted generators and for conservation and demand management programs.

The First Estimate: Published at the beginning of the month and incorporates a forecast of Ontario demand to project the revenue needed to cover the global adjustment costs for that month. It also takes into account variances from previous months. Actual Global Adjustment costs for the previous month are also posted.

Average Weighted Price (Month): The Hourly Ontario Energy Price weighted by the amount of electricity used throughout the province within each hour, with adjustments.

Hourly Uplift Settlement Charge: The Estimated Hourly Uplift Settlement Charges presents hourly estimates of this charge which covers the costs of Operating Reserve, Congestion Management Settlement Credits, Intertie Offer Guarantee payments (IOG), and other hourly costs such as energy losses on the IESO-controlled grid.


Current Hourly Ontario Energy Price

$-2.03/MWh
at 12:00 a.m. EST
October 21, 2014

down

Market Clearing Price
(5-minute price)

$-4.10/MWh
at 12:15 a.m. EST

nochange

Global Adjustment
(First Estimate)

$74.92/MWh
October

Global Adjustment
(Actual)

$79.63/MWh
September

Average Weighted Price

$5.54/MWh
(.55 cents/kWh)
for October

up

Hourly Uplift Charge Estimate

$1.00/MWh
at 11:00 p.m. EST

nochange

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Demand Overview

Read more about Ontario’s demand trends, records and seasonal peaks.

Learn more »

Supply Overview

Learn about Ontario’s current supply mix, a history of generation capability, and yearly imports and export values.

Learn more »

Price Overview

Historical prices including monthly average prices, Global Adjustment charge, and other electricity-related prices.

Learn more »

Monthly HOEP Peaks

On Peak
8 a.m. to 8 (M-F)
219.07 $/MWh
October 2014
Off Peak
8 p.m. to 8 a.m.
(M-F, weekends, holidays)
31.08 $/MWh
October 2014
Actual   Projected
Market Demand (MW)
Hour EndingDemand 
114,703 717,813 1318,620 1918,831
214,444 818,607 1418,522 2018,284
314,441 918,754 1518,688 2118,217
414,443 1019,029 1618,947 2217,463
515,039 1119,059 1718,871 2316,248
616,739 1218,905 1819,529 2416,041
Download: XML

The Market Day

October 20, 2014

Dispatch   Pre-Dispatch
HOEP Price ($/MWh)
Hour EndingPrice 
1-4.88 78.73 136.22 1917.34
2-4.93 88.86 148.57 2020.79
3-4.78 98.39 1511.07 2113.15
4-4.78 109.17 1613.21 2211.14
5-4.58 115.08 1785.54 236.00
61.57 129.30 1845.02 245.00
Download: XML
Actual   Projected
Ontario Demand (MW)
Hour EndingDemand 
112,219 715,746 1316,431 1917,679
211,917 816,292 1416,258 2017,248
311,915 916,299 1516,482 2116,642
411,889 1016,351 1617,037 2215,483
512,567 1116,478 1717,511 2314,034
614,119 1216,354 1817,679 2413,339
Download: XML

Peak Tracker

Top 5 Allocated Quantity of Energy Withdrawn (AQEW) Peaks from
May 1, 2014 to April 30, 2015
RankDateHour EndingAQEW (MW)
1Aug 26, 20141720,967
2Sep 5, 20141720,831
3Jul 22, 20141720,744
4Jun 30, 20141720,457
5Sep 4, 20141720,193
Download: XML

The IESO uses the "Hour Ending" naming convention for the hours in a day. For example, Hour 1 is from 12 a.m. to 1 a.m., Hour 2 is from 1 a.m. to 2 a.m. Hours 1-24 are the hours from midnight one day through midnight the next day. Eastern Standard Time is used year round.