IESO (Ontario) Hourly Nodal Prices

Nodal Price
Ontario's 10 Zone
Since 2008

Hourly nodal prices for Ontario's ten transmission zones

Charts of IESO (Ontario) Hourly Nodal Prices


  • Short-term and long-term prediction of dynamic electricity prices
  • Diurnal and seasonal average and distribution of historical power prices
  • Peak and off-peak price range analysis


IESO (Ontario) Hourly Nodal Prices


This data product offers hourly wholesale power prices in Ontario's 10 transmission zones and their nodal zones.

The Ontario transmission system is mainly comprised of a 500 kV transmission network, a 230 kV transmission network, and several 115 kV transmission networks.

Nodal Zone Coverage

Here are the list of transmission zones and their respective nodal zones in this data product:

Geographical Zone Node(s)
Bruce Zone BruceB
East Zone Saunders
Essa Zone Desjoachims
Niagara Zone BECK2
Northeast Zone Andrews, Canyon, NP Iroquois Falls
Northwest Zone Atikokan, Pine Portage, Thunderbay
Ottawa Zone TAOHSC
Southwest Zone GerdauCam
Toronto Zone Darlington
West Zone Greenfield

You can check out the Ontario Zonal Map for more details.

The hourly nodal pricing is not used for market settlements, but provides a representative indication of the relative cost of generation in each of Ontario's electrical zones based on transmission limitations and system conditions relative to generation and load.

Data Source

IESO (The Independent Electricity System Operator) works at the heart of Ontario's power system. The IESO delivers key services across the electricity sector including: managing the power system in real-time, planning for the province's future energy needs, enabling conservation and designing a more efficient electricity marketplace to support sector evolution.

Key Features

  • Includes hourly actual wholesale electricity prices in CAN$/MWh
  • Updated daily at or before 5:00 PM ET
  • Historical data goes back to 2008
  • Covers 10 Ontario zones including Bruce, East, Essa, Niagara, West, Toronto, Ottawa, North East, North West, South West


5 Data Columns

Delivery Datetime (delivery_dt)

The date and hour when the market runs and energy is supplied

Peak Hour Specification (on_peak_off_peak_hours)

The on peak, off peak flag of the hour

Intertie Zone (zone)

Ontario and its interconnections (intertie zones) with other jurisdictions (or control areas)

Nodal Zone (nodal_zone)

Nodal zone under one of the Ontario's electrical zone

Nodal Price (nodal_price)

Nodal price in CDN per megawatt hour

Data Provider

Alta Bering

Alta Bering is a Data Curation and Business Analytics Company with its roots in management consulting and decision science. Alta Bering is based in British Columbia and also offers a visual business analytics platform called EPO to help solve complex business problems by using popular Machine Learning and statistical methods

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