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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

19,260 MW
at 8:00 p.m. EST
May 27, 2016

down

5-minute Ontario Demand

18,960 MW
at 9:00 p.m. EST

down

Projected Ontario Demand (next hour)

19,257 MW
at 9:00 p.m. EST

down

Today's Projected Peak (Ontario)

19,533 MW
at 5:00 p.m. EST

Today's Projected Minimum (Ontario)

12,700 MW
at 4:00 a.m. EST

Market Demand

20,977 MW
at 8:00 p.m. EST

down

5-minute Market Demand

20,884 MW
at 8:50 p.m. EST

down

Today's Projected Peak (Market)

22,130 MW
at 4:00 p.m. EST

Today's Projected Minimum (Market)

15,292 MW
at 3:00 a.m. EST

Operating Reserve Requirement

1,418 MW
at 9:00 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

23,259 MW

up

Generator Availability

25,180 MW
at 8:00 p.m. EST

up

Nuclear Output

9,132 MW
at 8:00 p.m. EST

down

Hydro Output

5,561 MW
at 8:00 p.m. EST

up

Gas Output

4,094 MW
at 8:00 p.m. EST

down

Wind Output

210 MW
at 8:00 p.m. EST

down

Solar Output

3 MW
at 8:00 p.m. EST

up

Biofuel Output

36 MW
at 8:00 p.m. EST

up

Hourly Imports

1,859 MW
at 8:00 p.m. EST

up

Hourly Exports

1,815 MW
at 8:00 p.m. EST

down

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

$22.05/MWh
at 8:00 p.m. EST
May 27, 2016

down

Market Clearing Price
(5-minute price)

$21.34/MWh
at 8:45 p.m. EST

nochange

Global Adjustment
(First Estimate)

$104.05/MWh
May

Global Adjustment
(Actual)

$111.32/MWh
April

Average Weighted Price

$10.39/MWh
(1.04 cents/kWh)
for May

down

Hourly Uplift Charge Estimate

$1.00/MWh
at 8:00 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 »

Conservation Overview

Learn about the progress made by province’s electricity conservation and demand response programs in Ontario.

Learn more »

Actual   Projected
Market Demand (MW)
Hour EndingDemand 
115,692 717,042 1320,597 1921,246
215,327 818,189 1421,013 2020,977
314,815 919,118 1521,468 2121,297
414,952 1019,325 1621,682 2220,006
515,414 1119,802 1721,737 2318,624
615,915 1220,182 1821,501 2417,254
Download: XML

The Market Day

May 27, 2016

Dispatch   Pre-Dispatch
HOEP Price ($/MWh)
Hour EndingPrice 
19.07 711.03 1324.64 1923.52
210.09 817.91 1423.86 2022.05
323.57 921.36 1525.51 2121.34
46.48 1018.82 1626.15 2221.33
56.16 1121.86 1726.58 2318.96
67.44 1224.23 1826.37 2417.21
Download: XML
Actual   Projected
Ontario Demand (MW)
Hour EndingDemand 
113,063 715,479 1318,604 1919,474
212,766 816,408 1418,827 2019,260
312,462 917,048 1519,026 2119,257
412,449 1017,279 1619,314 2217,958
512,872 1117,776 1719,681 2316,244
613,704 1218,163 1819,668 2414,946
Download: XML

Data in Action

This graph provides a summary of Ontario's transmission-connected generator output, by fuel type, for 2010 and 2015. Production by nuclear units remain high, comprising 60 percent of generation in 2015. There has been rapid growth in wind and solar resources - output from both types of supply have increased significantly. With coal generation now phased out, former coal generating stations such as Atikokan and Thunder Bay have been converted to biofuel. The 2015 chart does not include the 488 MW of wind generation capacity or 1,838 MW solar generation capacity connected within distribution systems.

As of May 27, 2016
Top 10 Ontario Demand Peaks from May 1, 2016 to April 30, 2017

New Ontario demand records are updated in real time. Verified Ontario demand values (AQEW) published 20 business days later.

As of May 27, 2016
RankDateHour EndingOntario Demand (MW)AQEW (MW)
1May 27, 20161719,681
2May 25, 20162018,320
3May 26, 20161918,181
4May 24, 20161917,397
5May 02, 20162116,117
6May 19, 20162115,949
7May 12, 20162015,884
8May 04, 20162015,884
9May 03, 20162015,855
10May 17, 20162115,829
Download: XML

Recent Summaries

Global Adjustment


Global Adjustment (GA) Rates and Average Hourly Ontario Energy Price
GA RATES FOR BILLING
1st ($/MWh)2nd ($/MWh)Actual Rate ($/MWh)Average HOEP ($/MWh)*
Jan 201684.2392.1491.7913.69
Feb103.8496.7898.5112.56
Mar90.22102.99106.105.90
Apr121.15111.77111.326.11
May104.05
Jun
Jul
Aug
Sep
Oct
Nov
Dec

*Preliminary values for average weighted monthly price will be available soon after month end. Values will be finalized 10 business days after month end.

Download: XML

Monthly HOEP Peaks

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.