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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

12,662 MW
at 1:00 a.m. EST
October 21, 2014

down

5-minute Ontario Demand

12,283 MW
at 2:00 a.m. EST

down

Projected Ontario Demand (next hour)

12,510 MW
at 2:00 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

15,244 MW
at 1:00 a.m. EST

down

5-minute Market Demand

14,846 MW
at 2:00 a.m. EST

down

Today's Projected Peak (Market)

19,942 MW
at 7:00 p.m. EST

Today's Projected Minimum (Market)

14,089 MW
at 12:00 a.m. EST

Operating Reserve Requirement

1,418 MW
at 2:00 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

24,332 MW
at 1:00 a.m. EST

up

Nuclear Output

10,058 MW
at 1:00 a.m. EST

down

Hydro Output

3,423 MW
at 1:00 a.m. EST

up

Gas Output

930 MW
at 1:00 a.m. EST

up

Wind Output

611 MW
at 1:00 a.m. EST

down

Other Output

151 MW
at 1:00 a.m. EST

down

Hourly Imports

MW
at 1:00 a.m. EST

down

Hourly Exports

2,649 MW
at 1:00 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

$-3.79/MWh
at 1:00 a.m. EST
October 21, 2014

up

Market Clearing Price
(5-minute price)

$-4.30/MWh
at 1:55 a.m. EST

nochange

Global Adjustment
(First Estimate)

$74.92/MWh
October

Global Adjustment
(Actual)

$79.63/MWh
September

Average Weighted Price

$5.52/MWh
(.55 cents/kWh)
for October

up

Hourly Uplift Charge Estimate

$.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 »

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 
115,244 718,207 1318,214 1919,905
215,236 818,321 1418,268 2019,544
315,023 918,423 1518,328 2118,990
415,098 1018,200 1618,705 2217,898
515,626 1118,216 1718,978 2316,693
617,276 1218,307 1819,715 2414,104
Download: XML

The Market Day

October 21, 2014

Dispatch   Pre-Dispatch
HOEP Price ($/MWh)
Hour EndingPrice 
1-3.79 710.49 136.71 1926.82
2-4.30 86.20 145.16 2014.95
3-4.30 95.16 155.00 2113.94
4-4.30 105.16 167.23 226.83
5-4.10 116.20 1714.17 235.00
614.52 125.00 1815.04 24-4.70
Download: XML
Actual   Projected
Ontario Demand (MW)
Hour EndingDemand 
112,662 716,227 1316,348 1918,163
212,510 816,239 1416,292 2017,890
312,340 916,212 1516,387 2117,151
412,378 1016,302 1616,878 2215,970
512,876 1116,333 1717,369 2314,702
615,071 1216,323 1817,803 2413,789
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.