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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

12,219 MW
at 4:00 a.m. EST
September 30, 2014

up

5-minute Ontario Demand

12,562 MW
at 4:45 a.m. EST

down

Projected Ontario Demand (next hour)

12,891 MW
at 5:00 a.m. EST

up

Today's Projected Peak (Ontario)

17,778 MW
at 8:00 p.m. EST

Today's Projected Minimum (Ontario)

12,344 MW
at 3:00 a.m. EST

Market Demand

15,332 MW
at 4:00 a.m. EST

up

5-minute Market Demand

15,487 MW
at 4:45 a.m. EST

down

Today's Projected Peak (Market)

19,746 MW
at 8:00 p.m. EST

Today's Projected Minimum (Market)

13,961 MW
at 12:00 a.m. EST

Operating Reserve Requirement

1,418 MW
at 5:00 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

27,648 MW

up

Generator Availability

27,583 MW
at 4:00 a.m. EST

down

Nuclear Output

11,487 MW
at 4:00 a.m. EST

down

Hydro Output

2,743 MW
at 4:00 a.m. EST

up

Gas Output

617 MW
at 4:00 a.m. EST

up

Wind Output

287 MW
at 4:00 a.m. EST

up

Other Output

149 MW
at 4:00 a.m. EST

up

Hourly Imports

MW
at 4:00 a.m. EST

nochange

Hourly Exports

3,213 MW
at 4:00 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

$-4.32/MWh
at 4:00 a.m. EST
September 30, 2014

down

Market Clearing Price
(5-minute price)

$-4.20/MWh
at 4:40 a.m. EST

down

Global Adjustment
(First Estimate)

$80.49/MWh
September

Global Adjustment
(Actual)

$67.61/MWh
August

Average Weighted Price

$15.88/MWh
(1.59 cents/kWh)
for September

down

Hourly Uplift Charge Estimate

$.00/MWh
at 2:00 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 »

Data in Action

As of June 2014, there were 1,608 megawatts of wind and solar generating capacity operating within distribution service areas in Ontario. The energy produced by these embedded facilities off-sets the amount of energy required from the transmission system – and in the case of solar, reducing summer peaks.

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 
115,864 717,706 1318,641 1919,361
215,454 818,455 1418,484 2019,746
315,219 918,612 1518,472 2118,628
415,332 1018,128 1618,726 2217,125
516,273 1118,438 1718,948 2316,849
615,622 1218,535 1818,733 2413,961
Download: XML

The Market Day

September 30, 2014

Dispatch   Pre-Dispatch
HOEP Price ($/MWh)
Hour EndingPrice 
1-2.89 70.04 134.27 1912.50
2-4.31 810.21 140.02 2013.19
3-4.38 910.21 150.02 214.27
4-4.32 100.02 166.87 22-4.20
54.50 114.27 176.87 2310.61
6-4.50 126.83 180.01 24-10.00
Download: XML
Actual   Projected
Ontario Demand (MW)
Hour EndingDemand 
112,668 715,277 1316,333 1917,724
212,346 815,726 1416,231 2017,778
312,128 916,014 1516,281 2116,925
412,219 1016,131 1616,609 2215,638
512,891 1116,262 1716,890 2314,586
614,073 1216,269 1816,907 2413,656
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
2Jul 22, 20141720,744
3Jun 30, 20141720,457
4Jul 2, 20141420,144
5Jul 21, 20141819,873
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.