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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

16,019 MW
at 5:00 p.m. EST
September 22, 2014

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5-minute Ontario Demand

16,062 MW
at 5:15 p.m. EST

down

Projected Ontario Demand (next hour)

16,076 MW
at 6:00 p.m. EST

up

Today's Projected Peak (Ontario)

16,962 MW
at 8:00 p.m. EST

Today's Projected Minimum (Ontario)

11,558 MW
at 3:00 a.m. EST

Market Demand

18,226 MW
at 5:00 p.m. EST

up

5-minute Market Demand

17,743 MW
at 5:15 p.m. EST

down

Today's Projected Peak (Market)

18,965 MW
at 7:00 p.m. EST

Today's Projected Minimum (Market)

15,273 MW
at 12:00 a.m. EST

Operating Reserve Requirement

1,418 MW
at 6:00 p.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

27,611 MW

down

Generator Availability

28,795 MW
at 4:00 p.m. EST

up

Nuclear Output

12,112 MW
at 4:00 p.m. EST

down

Hydro Output

4,194 MW
at 4:00 p.m. EST

up

Gas Output

822 MW
at 4:00 p.m. EST

up

Wind Output

505 MW
at 4:00 p.m. EST

up

Other Output

169 MW
at 4:00 p.m. EST

nochange

Hourly Imports

491 MW
at 5:00 p.m. EST

up

Hourly Exports

2,377 MW
at 5:00 p.m. EST

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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

$15.09/MWh
at 5:00 p.m. EST
September 22, 2014

up

Market Clearing Price
(5-minute price)

$5.08/MWh
at 5:10 p.m. EST

up

Global Adjustment
(First Estimate)

$80.49/MWh
September

Global Adjustment
(Actual)

$67.61/MWh
August

Average Weighted Price

$16.12/MWh
(1.61 cents/kWh)
for September

down

Hourly Uplift Charge Estimate

$1.00/MWh
at 5:00 p.m. EST

nochange

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)
90.20 $/MWh
September 2014
Off Peak
8 p.m. to 8 a.m.
(M-F, weekends, holidays)
126.61 $/MWh
September 2014
Actual   Projected
Market Demand (MW)
Hour EndingDemand 
115,276 717,682 1317,788 1918,965
215,153 818,180 1417,955 2018,842
315,068 918,144 1517,772 2118,288
415,167 1017,935 1618,012 2217,386
515,344 1118,015 1718,687 2316,278
616,376 1217,839 1818,073 2415,273
Download: XML

The Market Day

September 22, 2014

Dispatch   Pre-Dispatch
HOEP Price ($/MWh)
Hour EndingPrice 
1-4.60 710.76 133.26 1914.38
2-4.60 85.76 147.28 2014.38
3-4.59 98.02 158.07 2113.43
4-4.54 101.62 1611.95 2213.07
5-4.56 111.22 175.00 234.96
6-3.63 128.86 185.05 24-4.40
Download: XML
Actual   Projected
Ontario Demand (MW)
Hour EndingDemand 
111,692 715,056 1315,292 1916,700
211,573 815,449 1415,182 2016,962
311,463 915,451 1515,159 2116,343
411,480 1015,558 1615,556 2215,200
511,964 1115,536 1716,041 2313,882
613,389 1215,383 1816,076 2412,976
Download: XML

Peak Tracker

Top 5 Allocated Quantity of Energy Withdrawn (AQEW) Peaks from
May 1, 2014 to April 30, 2015
RankDateHour EndingAQEW (MW)
1Jul 22, 20141720,744
2Jun 30, 20141720,457
3Jul 2, 20141420,144
4Jul 21, 20141819,873
5Jul 1, 20141719,783
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.