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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

17,688 MW
at 9:00 p.m. EST
August 1, 2014

up

5-minute Ontario Demand

16,516 MW
at 9:30 p.m. EST

down

Projected Ontario Demand (next hour)

16,756 MW
at 10:00 p.m. EST

down

Today's Projected Peak (Ontario)

18,251 MW
at 6:00 p.m. EST

Today's Projected Minimum (Ontario)

12,795 MW
at 4:00 a.m. EST

Market Demand

19,216 MW
at 9:00 p.m. EST

up

5-minute Market Demand

17,896 MW
at 9:30 p.m. EST

down

Today's Projected Peak (Market)

20,890 MW
at 4:00 p.m. EST

Today's Projected Minimum (Market)

15,564 MW
at 4:00 a.m. EST

Operating Reserve Requirement

1,418 MW
at 10:00 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

28,282 MW

up

Generator Availability

28,332 MW
at 8:00 p.m. EST

up

Nuclear Output

11,368 MW
at 8:00 p.m. EST

up

Hydro Output

4,731 MW
at 8:00 p.m. EST

up

Gas Output

1,780 MW
at 8:00 p.m. EST

up

Wind Output

25 MW
at 8:00 p.m. EST

up

Other Output

160 MW
at 8:00 p.m. EST

up

Hourly Imports

1,091 MW
at 9:00 p.m. EST

down

Hourly Exports

1,618 MW
at 9:00 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

$31.22/MWh
at 9:00 p.m. EST
August 1, 2014

down

Market Clearing Price
(5-minute price)

$29.00/MWh
at 9:25 p.m. EST

nochange

Global Adjustment
(First Estimate)

$61.08/MWh
August

Global Adjustment
(Actual)

$60.25/MWh
June

Average Weighted Price

$30.89/MWh
(3.09 cents/kWh)
for August

up

Hourly Uplift Charge Estimate

$1.00/MWh
at 9:00 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 »

Data in Action

The effects of demand response (DR) is seen in the control room every day – on a typical day, demand holds fairly flat until 7 p.m., then decreases as off-peak price period starts. With market incentive programs such as Global Adjustment Allocation and DR3, the IESO has seen at least 900 MW of DR on the hottest days of the summer.

Recent Summaries

Monthly HOEP Peaks

On Peak
8 a.m. to 8 (M-F)
72.18 $/MWh
August 2014
Off Peak
8 p.m. to 8 a.m.
(M-F, weekends, holidays)
14.29 $/MWh
August 2014
Actual   Projected
Market Demand (MW)
Hour EndingDemand 
115,955 717,074 1320,346 1919,094
215,874 817,874 1420,560 2019,176
315,525 918,737 1520,905 2119,216
415,323 1019,064 1620,938 2218,291
515,312 1119,510 1719,926 2316,903
616,043 1220,015 1819,554 2416,174
Download: XML

The Market Day

August 1, 2014

Dispatch   Pre-Dispatch
HOEP Price ($/MWh)
Hour EndingPrice 
114.25 714.10 1332.79 1932.09
214.29 824.03 1445.75 2034.18
37.80 934.43 1572.18 2131.22
413.45 1031.05 1654.31 2229.01
512.88 1131.82 1732.39 2342.86
614.16 1231.84 1834.21 2444.78
Download: XML
Actual   Projected
Ontario Demand (MW)
Hour EndingDemand 
113,338 714,464 1318,040 1917,775
213,049 815,612 1418,258 2017,628
312,788 916,439 1518,403 2117,688
412,655 1016,916 1618,545 2216,756
513,011 1117,358 1718,360 2315,498
613,556 1217,764 1818,044 2414,371
Download: XML

Peak Tracker

Top 5 Allocated Quantity of Energy Withdrawn (AQEW) Peaks from
May 1, 2014 to April 30, 2015
RankDateHour EndingAQEW (MW)
1Jun 30, 20141720,457
2Jul 2, 20141420,143
3Jul 1, 20141719,782
4Jul 7, 20141719,594
5Jun 17, 20141719,439
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.