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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

13,748 MW
at 2:00 a.m. EST
January 24, 2017

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5-minute Ontario Demand

13,628 MW
at 2:10 a.m. EST

up

Projected Ontario Demand (next hour)

13,498 MW
at 3:00 a.m. EST

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Today's Projected Peak (Ontario)

18,753 MW
at 6:00 p.m. EST

Today's Projected Minimum (Ontario)

13,427 MW
at 4:00 a.m. EST

Market Demand

16,584 MW
at 2:00 a.m. EST

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5-minute Market Demand

16,434 MW
at 2:10 a.m. EST

up

Today's Projected Peak (Market)

21,252 MW
at 7:00 p.m. EST

Today's Projected Minimum (Market)

16,520 MW
at 4:00 a.m. EST

Operating Reserve Requirement

1,418 MW
at 7:00 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

27,000 MW

down

Generator Availability

29,120 MW
at 12:00 a.m. EST

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Nuclear Output

11,552 MW
at 12:00 a.m. EST

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Hydro Output

3,993 MW
at 12:00 a.m. EST

down

Gas Output

357 MW
at 12:00 a.m. EST

down

Wind Output

1,118 MW
at 12:00 a.m. EST

down

Solar Output

MW
at 12:00 a.m. EST

nochange

Biofuel Output

17 MW
at 12:00 a.m. EST

down

Hourly Imports

395 MW
at 2:00 a.m. EST

nochange

Hourly Exports

2,885 MW
at 2:00 a.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

$21.26/MWh
at 2:00 a.m. EST
January 24, 2017

up

Market Clearing Price
(5-minute price)

$.00/MWh
at 2:05 a.m. EST

down

Global Adjustment
(First Estimate)

$66.87/MWh
January

Global Adjustment
(Actual)

$87.08/MWh
December

Average Weighted Price

$22.47/MWh
(2.25 cents/kWh)
for January

up

Hourly Uplift Charge Estimate

$1.00/MWh
at 1:00 a.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 »

The Market Day

January 24, 2017

Dispatch   Pre-Dispatch
HOEP Price ($/MWh)
Hour EndingPrice 
116.45 739.26 1337.53 1933.72
221.26 839.15 1437.60 2031.64
31.50 939.15 1536.40 2134.26
43.00 1037.81 1637.59 2232.86
54.98 1137.62 1739.15 2335.07
639.15 1237.62 1825.74 2432.00
Download: XML
Actual   Projected
Ontario Demand (MW)
Hour EndingDemand 
114,097 716,188 1317,207 1918,689
213,748 817,154 1417,147 2018,536
313,498 917,251 1517,115 2118,158
413,427 1017,224 1617,398 2217,393
513,565 1117,216 1718,305 2316,315
614,799 1217,242 1818,753 2415,255
Download: XML
Actual   Projected
Market Demand (MW)
Hour EndingDemand 
116,967 718,947 1319,419 1921,252
216,584 819,990 1419,275 2020,791
316,610 919,800 1519,102 2120,376
416,520 1019,715 1619,528 2219,048
516,598 1119,290 1720,460 2318,017
617,697 1219,436 1821,138 2417,471
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 January 24, 2017
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 January 24, 2017
RankDateHour EndingOntario Demand (MW)AQEW (MW)
1September 07, 20161723,21322,527
2August 10, 20161823,10022,637
3August 11, 20161722,81222,318
4July 13, 20161822,65922,189
5August 12, 20161722,40221,904
6August 04, 20161722,31221,868
7September 06, 20161722,15021,641
8July 22, 20161722,02421,665
9September 08, 20161821,96321,200
10August 05, 20161321,92621,408
Download: XML

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 201766.87
Feb
Mar
Apr
May
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.