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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

15,823 MW
at 10:00 p.m. EST
October 30, 2014

down

5-minute Ontario Demand

14,545 MW
at 10:35 p.m. EST

down

Projected Ontario Demand (next hour)

14,624 MW
at 11:00 p.m. EST

down

Today's Projected Peak (Ontario)

17,973 MW
at 7:00 p.m. EST

Today's Projected Minimum (Ontario)

12,511 MW
at 3:00 a.m. EST

Market Demand

17,898 MW
at 10:00 p.m. EST

down

5-minute Market Demand

16,739 MW
at 10:35 p.m. EST

down

Today's Projected Peak (Market)

19,746 MW
at 7:00 p.m. EST

Today's Projected Minimum (Market)

15,521 MW
at 2:00 a.m. EST

Operating Reserve Requirement

1,418 MW
at 11:00 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

26,168 MW

up

Generator Availability

25,473 MW
at 10:00 p.m. EST

down

Nuclear Output

11,058 MW
at 10:00 p.m. EST

nochange

Hydro Output

4,632 MW
at 10:00 p.m. EST

down

Gas Output

953 MW
at 10:00 p.m. EST

up

Wind Output

235 MW
at 10:00 p.m. EST

up

Other Output

127 MW
at 10:00 p.m. EST

down

Hourly Imports

893 MW
at 10:00 p.m. EST

down

Hourly Exports

2,172 MW
at 10:00 p.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

$9.70/MWh
at 10:00 p.m. EST
October 30, 2014

up

Market Clearing Price
(5-minute price)

$13.25/MWh
at 10:30 p.m. EST

down

Global Adjustment
(First Estimate)

$74.92/MWh
October

Global Adjustment
(Actual)

$79.63/MWh
September

Average Weighted Price

$6.54/MWh
(.65 cents/kWh)
for October

up

Hourly Uplift Charge Estimate

$3.00/MWh
at 8:00 p.m. EST

up

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)
108.56 $/MWh
October 2014
Actual   Projected
Market Demand (MW)
Hour EndingDemand 
115,322 718,030 1318,024 1919,378
215,284 818,179 1418,199 2019,106
315,151 917,967 1518,080 2118,618
415,525 1017,934 1618,257 2217,898
515,953 1118,119 1719,004 2317,012
617,026 1218,040 1819,375 2416,617
Download: XML

The Market Day

October 30, 2014

Dispatch   Pre-Dispatch
HOEP Price ($/MWh)
Hour EndingPrice 
110.30 735.37 1313.97 1926.93
23.72 815.19 1413.93 2026.44
30.51 918.20 1514.41 2127.92
47.38 1014.31 1614.98 229.70
510.85 1114.37 1719.09 235.00
623.98 1213.93 1829.13 245.00
Download: XML
Actual   Projected
Ontario Demand (MW)
Hour EndingDemand 
112,773 716,246 1315,886 1917,785
212,603 816,267 1415,977 2017,489
312,407 915,913 1516,011 2117,013
412,622 1015,866 1616,453 2215,823
513,294 1115,884 1716,936 2314,624
614,721 1215,858 1817,585 2413,734
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.