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Technical Interfaces

This page contains information about the current technical interfaces with IESO's market systems. These interfaces are categorized by the functions performed by the IESO and/or market participants. Choose a functional area below to see all relevant documents.

Upcoming changes to these interfaces are listed on the Pending Changes - Documents and Pending Changes - Reports pages.

Procedural information for each function is included in the Market Rules & Manuals Library.

Security

IESO Java Policy File

This revised Java policy file, which replaces the previous existing policy files, contains additional security settings to enable use of the new Verizon CA. The previous java policy files are no longer available as they do not meet IESO MPI java security requirements. The Java policy file must be installed on a user’s workstation for successful login and use of the Market Participant Interface (MPI) when using Internet Explorer browser. Without this file, login to the MPI will be unsuccessful. Further instructions for installing the policy file can be accessed here.

Last Updated Mar 2, 2016
Document zip

Market Participant Submissions (incl. MIM, EMI & API)

Market Participant Client Platform Information Technology Standard (IESO_ISTD_0017)

This document is intended to clearly and concisely present the standards and guidelines for the upgrade of the Market Participant Client Platform.

Last Updated Mar 5, 2007
Document pdf

Physical Market Bids (RTEM) (IMO_TPL_0028)

This template is used to specify the bids or offers for various resources like generators, loads, off-takes and injections.

Pending Change - To be obsolete
Last Updated Jun 1, 2005
Sample txt
Template pdf

Physical Market Standing Bids (RTEM)

This template is used to specify the standing bids or offers for various resources like generators, loads, off-takes and injections.

Last Updated Jun 1, 2005
Sample txt
Template pdf

Physical Market Schedules (IMO_TPL_0029)

This template is used to specify the schedules for various resources.

Pending Change - To be obsolete
Last Updated Jun 1, 2005
Sample txt
Template pdf

Physical Market Standing Schedules

This template is used to specify the standing schedules for various resources.



Last Updated Jun 1, 2005
Sample txt
Template pdf

Operating Reserve Valid Bids (IMO_TPL_0016)

This template is used to send Operating Reserve Offer/Bid data to the IESO.

Pending Change - To be obsolete
Last Updated Jun 1, 2005
Sample txt
Template pdf

Operating Reserve Standing Bids

This template is used to send standing Operating Reserve Offer/Bid data to the IESO.

Last Updated Jun 1, 2005
Sample txt
Template pdf

Bilateral Contracts (IMO_TPL_0030)

This template is used to specify the hourly amount exchanged between parties to the bilateral contract.

Pending Change - To be obsolete
Last Updated Jun 1, 2005
Sample txt
Template pdf

Bilateral Standing Contracts

This template is used to specify the hourly amount exchanged between parties to the bilateral contract.

Last Updated Jun 1, 2005
Sample txt
Template pdf

Validation Rules/Message and Abbreviations

This document, which is in DRAFT form, describes: the validation rules; the messages returned as a result of the validations; and abbreviations used in data submission templates.

Pending Change - To be obsolete
Last Updated Jun 1, 2005
Template rtf

IESO Developers Kit (IDK) Implementation Manual (IMO_MAN_0023)

This document describes the functionality of the MIM programmatic application interface that enables programmatic bid and offer submission functionality for the Energy Markets.. (i.e. use of the MIM API).

Pending Change - To be obsolete
Last Updated Mar 7, 2012
Document pdf

Market Information Management Application Interface (IDK)

This signed IESO Developers Kit provides the programmatic API to submit/download MIM data using CSV data files. This version of the API works with either UserID/Password or Digital Certificate.

Pending Change - To be obsolete
Last Updated Oct 12, 2011
Document zip

Market Information Management Application Interface (Web Services)

This signed IESO MIM Web Services provides the programmatic API to submit/download MIM data using SOAP based web services. This version of the API requires two part of authentication: UserID/Password and whitelisted client machine IP address.

Quick Reference Guide

Last Updated Aug 11, 2016
Document zip WSDL XSD

Outage Management

Web Service Design Specification (SPEC-113)

This document provides the design specification for Outage Coordination and Scheduling System (OCSS) web service.

Last Updated Oct 26, 2016
Document pdf

Planned Transmission Outages Report

This report shows the future transmission outages for various time frames; daily, monthly and six-monthly.

The following sets of reports are made available to participants:

- daily reports until the end of the next month;

- Monthly reports for the following six months;

- 6-monthly reports available for the following year.


Last Updated Sep 25, 2002
Publishing Frequency Daily
Report Period Day, Month, 6-Month
Sample html csv

Historical Transmission Outage Report

This report lists the outages that have occurred or were in-progress for the previous hour.

Last Updated Aug 28, 2002
Publishing Frequency Hourly
Report Period Previous 1 Hour
Sample html csv

Market Participant Requests

Four Hour Predispatch Operating Reserve Market Information Report

This report is identical in structure to the Operating Reserve Predispatch Report (MP specific). It will only contain predispatch results for the next 4 hours and will be produced before the same report for the full predispatch timeframe. When the 4 hour period crosses a day boundary, a separate report will be generated for each day.

Last Updated Dec 21, 2001
Sample txt
Template pdf

Physical Market RTEM Valid Bids (IMO_TPL_0028)

This template is used to retrieve the bids or offers for various resources like generators, loads, offtakes and injections.

Last Updated Jun 5, 2006
Sample txt
Template pdf

Physical Market RTEM Valid Standing Bids

This template is used to retrieve standing bids or offers for various resources like generators, loads, offtakes and injections.

Last Updated Jun 5, 2006
Sample txt
Template pdf

Physical Market Energy (Bid) Summary

This template is used to provide a market participant with a summary of their resources for which there are active bids.

Last Updated Oct 12, 2001
Sample txt
Template pdf

Physical Market Schedules Valid Bids (IMO_TPL_0029)

This template is used to retrieve the schedules for various resources.

Last Updated Jun 1, 2005
Sample txt
Template pdf

Physical Market Schedules Valid Standing Bids

This template is used to retrieve standing schedules for various resources.

Last Updated Jun 1, 2005
Sample txt
Template pdf

Physical Market Schedules (Bid) Summary

This template is used to provide a market participant with a summary of their resources for which there are active schedules.

Last Updated Oct 12, 2001
Sample txt
Template pdf

Operating Reserve Valid Bids

This template is used to retrieve Operating Reserve Offer/Bid data.

Last Updated Jun 5, 2006
Sample txt
Template pdf

Operating Reserve Valid Standing Bids

This template is used to retrieve standing Operating Reserve Offer/Bid data

Last Updated Jun 5, 2006
Sample txt
Template pdf

Physical Market Bilateral Valid Bids

This template is used to retrieve hourly amount exchanged between parties to the bilateral contract.

Last Updated Jun 1, 2005
Sample txt
Template pdf

Physical Market Bilateral Valid Standing Bids

This template is used to retrieve standing hourly amount exchanged between parties to the bilateral contract.

Last Updated Jun 1, 2005
Sample txt
Template pdf

Physical Market Bilateral Contract (Bid) Summary

This template is used to provide a market participant with a summary of their resources for which there are active bilateral contracts.

Last Updated Nov 21, 2001
Sample txt
Template pdf

Physical Market Predispatch Report

This report provides pre-dispatch energy schedule information for each hour of the forecast period

Last Updated Sep 26, 2001
Sample txt
Template pdf

Physical Market Dispatch Constrained Hourly Report (IESO_TPL_0035)

This report contains energy dispatch schedules for each 5-minute interval of a particular hour.

Last Updated Jun 5, 2006
Sample txt
Template pdf

Physical Market Dispatch Unconstrained Hourly Report

This report contains the energy Market Schedule for each 5-minute interval of a particular hour; i.e., the dispatch schedule in the absence of system constraints

Last Updated Dec 21, 2001
Template pdf

Physical Market Dispatch 5-minute Report (IESO_TPL_0033)

This 5-Minute Dispatch Schedule Report contains preliminary information on facility dispatch schedules for a particular 5-minute scheduling interval. These schedules are subject to change.

Last Updated Jun 5, 2006
Sample txt
Template pdf

Operating Reserve Predispatch Report

This template is used to retrieve Operating Reserve Offer/Bid data.

Last Updated Sep 26, 2001
Template pdf

Operating Reserve Dispatch Constrained Hourly Report (IESO_TPL_0036)

This report contains dispatch schedules for Operating Reserve for each 5-minute interval of a particular hour.

Last Updated Jun 5, 2006
Sample txt
Template pdf

Operating Reserve Dispatch Unconstrained Report

This report contains the Operating Reserve Market Schedule for each 5-minute interval of a particular hour; i.e., the dispatch schedule in the absence of system constraints.

Last Updated Dec 21, 2001
Template pdf

Operating Reserve Dispatch 5-minute Report (IESO_TPL_0034)

This 5-Minute Dispatch Schedule Report contains preliminary information on facility dispatch schedules for a particular 5-minute scheduling interval. These schedules are subject to change.

Last Updated Jun 5, 2006
Sample txt
Template pdf

Operating Reserve (Bid) Summary

This template is used to provide a market participant with a summary of their resources for which there are active Operating Resource bids.

Last Updated Sep 26, 2001
Sample txt
Template pdf

Four Hour Predispatch Energy Market Information Report

This report is identical in structure to the Physical Market Predispatch Report (MP specific). It will only contain predispatch results for the next 4 hours and will be produced before the same report for the full predispatch timeframe. When the 4 hour period crosses a day boundary, a separate report will be generated for each day.

Last Updated Dec 21, 2001
Sample txt
Template pdf

Market Results

Multi-Interval Optimization, Functional Requirements (IMO_REQ_0048)

This document defines the functional requirements and current settings for Multi-Interval Optimization.

Last Updated Jun 1, 2005
Document pdf

Operating Reserve Predispatch Unconstrained Report for OR in the Market

This report provides unconstrained pre-dispatch Operating Reserve schedule information for OR in the Market.

Last Updated Jul 25, 2003
Publishing Frequency Hourly
Report Period Dispatch Day
Sample csv
Template pdf

Operating Reserve Predispatch Constrained Report for OR in the Market

This report provides constrained pre-dispatch Operating Reserve schedule information for OR in the Market.

Last Updated Jul 25, 2003
Publishing Frequency Hourly
Report Period Dispatch Day
Sample csv
Template pdf

Operating Reserve Dispatch Constrained Hourly Report for OR in the Market

This report contains dispatch schedules for Operating Reserve in the Market for each 5-minute interval of a particular hour.

Last Updated Jul 25, 2003
Publishing Frequency Hourly
Report Period Dispatch Hour
Sample csv
Template pdf

Operating Reserve Dispatch Unconstrained Report for OR in the Market

This report contains the Operating Reserve Market Schedule for each 5-minute interval of a particular hour for OR in the market; i.e., the dispatch schedule in the absence of system constraints.

Last Updated Jul 25, 2003
Publishing Frequency Hourly
Report Period Dispatch Hour
Sample csv
Template pdf

Predispatch Unconstrained Energy Price Report

This report provides market clearing price (MCP) energy and Operating Reserve for all zones for each hour of the forecast period

Last Updated Dec 21, 2001
Publishing Frequency Hourly
Sample csv
Template pdf

Dispatch Unconstrained Energy Price Report

This report provides the Market Clearing Price for energy and Operating Reserve, for all zones, for each 5 minute interval of the hour.

Last Updated Dec 21, 2001
Sample csv
Template pdf

Predispatch Unconstrained Totals Report

This report provides a forecast of expected load, available energy, Operating Reserve requirements, and losses for each hour of the forecast period as established by the unconstrained predispatch run of the algorithm.

Last Updated Sep 26, 2001
Publishing Frequency Hourly
Sample csv
Template pdf

Predispatch Constrained Totals Report (IESO_TPL_0045)

This report provides a forecast of expected load, available energy, Operating Reserve requirements, and losses for each hour of the forecast period as established by the constrained predispatch run of the algorithm.

Last Updated Mar 7, 2007
Publishing Frequency Hourly
Sample csv
Template pdf

Dispatch Unconstrained Totals Report (IESO_TPL_0046)

This report provides the total energy and Operating Reserve scheduled as well as the market demand as established by the unconstrained dispatch run of the algorithm, for each 5 minute interval of the hour.

Last Updated Mar 7, 2007
Publishing Frequency Hourly
Sample csv
Template pdf

Dispatch Area Operating Reserve Shortfalls

This report contains Operating Reserve shortfalls, in five-minute intervals, for the previous dispatch hour for each dispatch area.

Last Updated Apr 9, 2002
Publishing Frequency Hourly
Sample htm csv

Dispatch Area Operating Reserve and Energy Called from Operating Reserve

This report contains both scheduled and utilized Operating Reserve for the previous dispatch hour, by dispatch area.

Last Updated Sep 10, 2003
Publishing Frequency Hourly
Sample html csv

Predispatch Area Operating Reserve Shortfalls

This report contains Operating Reserve shortfalls in each hour for a pre-dispatch day, by dispatch area.

Last Updated Apr 9, 2002
Publishing Frequency Hourly
Sample htm csv

Dispatch Constrained Totals Report

This report provides the total energy and Operating Reserve scheduled as well as the market demand as established by the constrained dispatch run of the algorithm, for each 5 minute interval of the hour.

Last Updated Mar 27, 2002
Publishing Frequency Hourly
Sample csv

Predispatch Unconstrained Regional Constraints Report

This report contains the intertie scheduling limits used as inputs to the unconstrained run of the predispatch algorithm.

Last Updated Sep 26, 2001
Publishing Frequency Hourly
Sample csv
Template pdf

Predispatch Constrained Regional Constraints Report

This report contains the area Operating Reserve constraints and intertie scheduling limits used as inputs to the constrained run of the predispatch algorithm.

Last Updated Sep 26, 2001
Publishing Frequency Hourly
Sample csv
Template pdf

Dispatch Unconstrained Regional Constraints Report

This report contains the intertie scheduling limits between Ontario and neighbouring control areas produced by the real time unconstrained run of the algorithm, for each 5 minute interval of the hour.

Last Updated Dec 21, 2001
Publishing Frequency Hourly
Sample csv
Template pdf

Dispatch Constrained Regional Constraints Report

This report contains the intertie scheduling limits between Ontario and neighbouring control areas and the internal Operating Reserve Constraints produced by the real time constrained run of the algorithm, for each 5 minute interval of the hour.

Last Updated Dec 21, 2001
Publishing Frequency Hourly
Sample csv
Template pdf

Predispatch Security Constraints Report (IMO_TPL_0017)

This report contains a list of binding security constraints for the predispatch run of the algorithm.

Last Updated Dec 5, 2002
Sample html csv
Template pdf

Dispatch Security Constraints Report (IMO_TPL_0018)

This report contains a list of binding security constraints for the dispatch run of the algorithm, for each 5 minute interval of the hour.

Last Updated Dec 5, 2002
Publishing Frequency Hourly
Sample html csv
Template pdf

Predispatch Constrained Shadow Prices Report

This report contains pre-dispatch Shadow Prices at selected nodes within Ontario.

Last Updated Mar 11, 2002
Publishing Frequency Hourly
Sample csv
Template pdf

Dispatch Constrained Shadow Prices Report

This report contains dispatch Shadow Prices at selected nodes within Ontario, for each 5 minute interval of the hour.

Last Updated Mar 11, 2002
Publishing Frequency Hourly
Sample csv
Template pdf

Dispatch Unconstrained Energy HOEP Price Report

This report displays the Hourly Ontario Energy Price for each preceding hour of the day.

Last Updated Dec 21, 2001
Publishing Frequency Hourly
Sample csv
Template pdf

Dispatch Unconstrained Price Disaggregation Report

This report provides each 5-minute price disaggregated for both Energy and Operating Reserve for all zones for each preceding hour of the day.

Last Updated Jan 24, 2002
Publishing Frequency Hourly
Sample csv
Template pdf

Dispatch Deviation Monthly Report

Subject to Market Rule, Ch. 7, sec. 4.2.2 and sec 4.2.3 this report summarizes the number of occurrences where the IESO has deviated significantly from the results of the dispatch algorithm, the action taken and the rationale for doing so. An occurrence may cover one or more intervals and all occurrences recorded in the IESO Shift Operations log are considered significant.

Last Updated Jul 4, 2002
Publishing Frequency Monthly
Sample html

Intertie Schedules and Flow Report Schema

Sample file intended to allow report users to set up their XML parser for receiving the Intertie Schedules and Flow report. Refer also to shared schemas.

Last Updated Oct 3, 2003
Sample xsd

Generator Output and Capability Report Schema

Sample file intended to allow report users to set up their XML parser for receiving the Generator Output and Capability report. Refer also to shared schemas.

Last Updated Dec 10, 2003
Sample xsd

Hourly Ontario Energy Price (HOEP) Report Schema

Sample file intended to allow report users to set up their XML parser for receiving the Hourly Ontario Energy Price (HOEP) report. Refer also to shared schemas.

Last Updated Dec 10, 2003
Sample xsd

Dispatch Advisory Report Schema

Sample file intended to allow report users to set up their XML parser for receiving the Dispatch Advisory report. Refer also to shared schemas.

Last Updated Jun 23, 2004
Sample xsd

DACP Predispatch Energy Report Schema

Sample file intended to allow report users to set up their XML parser for receiving the DACP Predispatch Energy report. Refer also to shared schemas.

Last Updated Jun 7, 2006
Sample xsd

DACP Predispatch Prices Report Schema

Sample file intended to allow report users to set up their XML parser for receiving the DACP Predispatch Prices report. Refer also to shared schemas.

Last Updated Jun 7, 2006
Sample xsd

DACP Adequacy Report Schema

Sample file intended to allow report users to set up their XML parser for receiving the DACP Adequacy report. Refer also to shared schemas.

Last Updated Jun 7, 2006
Sample xsd

DACP Reliability Commitment Report Schema

Sample file intended to allow report users to set up their XML parser for receiving the DACP Reliability Commitment report. Refer also to shared schemas.

Last Updated Jun 7, 2006
Sample xsd

DACP Commitments Report Schema

Sample file intended to allow report users to set up their XML parser for receiving the DACP Commitments report. Refer also to shared schemas.

Last Updated Jun 7, 2006
Sample xsd

DACP Check Source/ADE Report Schema

Sample file intended to allow report users to set up their XML parser for receiving the DACP Check Source/ADE report. Refer also to shared schemas.

Last Updated Jun 7, 2006
Sample xsd

Financially Binding Status

Sample file intended to allow report users to set up their XML parser for receiving the DACP Financially Binding Status report. Refer also to shared schemas.

Last Updated Aug 17, 2006
Sample xsd

Adequacy

Sample file intended to allow report users to set up their XML parser for receiving the Adequacy report. Refer also to shared schemas.

Last Updated Feb 19, 2007

Market Forecasts

Daily SAA hourly data report (TPL-27)

This report is used to post Daily System Adequacy and Assessment Report hourly data.

Last Updated Feb 5, 2014
Publishing Frequency Daily
Report Period 12 Days
Sample csv
Template pdf

SAA daily notes and limitations report (IESO_TPL_0087)

This report is used to post Daily System Adequacy and Assessment Report Transmission Flowgate Limitations, System Advisories and SAA Notes data.

Last Updated Mar 7, 2012
Publishing Frequency Daily
Report Period 12 Days
Sample csv
Template pdf

SAA daily all data report

This report is used to post Daily System Adequacy and Assessment Report combined hourly and Transmission Flowgate Limitations, System Advisories and SAA Notes data in an html format.

Last Updated Mar 19, 2002
Publishing Frequency Daily
Report Period 12 Days
Sample htm

Weekly SAA report (IESO_TPL_0088)

This report is used to post Weekly System Adequacy and Assessment Report data for public information.

Last Updated Feb 5, 2014
Publishing Frequency Daily
Report Period 35 Days
Sample htm csv
Template pdf

Daily SSR hourly data report (IMO_TPL_0022)

This report is used to post System Status Report hourly data.

Last Updated Feb 5, 2014
Publishing Frequency Daily
Report Period 3 Days
Sample csv
Template pdf

SSR daily notes and limitations Report (IMO_TPL_0023)

This report is used to post System Status Report Transmission Flowgate Limitations, SA Notices and SAA Notes data.

Last Updated Mar 7, 2012
Publishing Frequency Daily
Report Period 3 Days
Sample csv
Template pdf

SSR daily all data report

This report is used to post System Status Report combined hourly and Transmission Flowgate Limitations, System Advisories and SAA Notes data in an html format.

Last Updated Mar 19, 2002
Publishing Frequency Daily
Report Period 3 Days
Sample htm

Message Exchange

Web Based Message Exchange, Market Participant's Guide (IMP_MAN_0031)

This guide provides market participants with the details of how they interact and interface with the web based message exchange system for receiving dispatch messages.

Last Updated Sep 30, 2013
Document pdf

Dispatch Messaging - ICCP

Included in the 'Participant Technical Reference Manual'.

Last Updated Jun 4, 2003

Web Based Message Exchange API

Downloadable API for message exchange (refer to User Guide).

Last Updated Mar 7, 2007
Document zip

Transmission Rights

Transmission Rights Auction System - Market Participant User Guide (IMO_GDE_0004)

This document provides a description of the functionality of the IESO's Transmission Rights Auction which is available to those market participants who have registered to be TR participants.

Last Updated Dec 7, 2011
Document pdf

Transmission Auction Participant Notification Report

This report contains a TR Participant’s results for a TR auction round. The TR Participant must have participated in a TR auction round specified by placing an accepted bid in order to receive a Participant Notification Report. The report provides notice of what transmission rights, if any, have been awarded and the resultant TR market clearing price. It also lists the round end time and the time structure. A report will be issued, regardless if a TR participant was successful or not.

The report can be accessed through the Market Participant Interface (MPI).

Last Updated Jul 18, 2001
Publishing Frequency Within 24 Hours of Auction Closing
Sample html

Transmission Auction Participant Bid History Report

This report enables a TR participant to view TR bids submitted by them, and their status over the last 18 months. The TR participant must have participated in the TR auction round specified by placing an accepted bid in order to receive the Bid History Report.

The report can be accessed through the Market Participant Interface (MPI).

Last Updated Jul 18, 2001
Publishing Frequency Within 24 Hours of Auction Closing
Sample html

Post Auction MCP Report

This report provides aggregated auction results after the TR auction round has been completed. The report identifies the total number of TRs awarded and the associated TR market clearing price for a particular path in a TR auction round.

The report will remain visible from the user interface page for thirty days from the TR Auction round completion. The report can be accessed through the IESO Web site.

Last Updated Apr 18, 2002
Publishing Frequency Within 24 Hours of Auction Closing
Sample html

Daily TR Hourly Zonal Price Report

This report enables you to view, in a daily format, the hourly zonal prices determined by the last projected market price (the zonal price from the last run of the Predispatch Unconstrained schedule) for energy. The report looks backward for 60 days to ensure that any price changes are captured in the report.

The report can be accessed through the user interface of the IESO Web site for the previous 3 days of data. Data from previous days, up to 12 months into the past, are available from the IESO Reports site.

Last Updated Apr 18, 2002
Publishing Frequency Daily at 6:30 EST
Sample html

Monthly TR Hourly Zonal Price Report

This report enables you to view, in a monthly format, the hourly zonal prices determined by the last projected market price (the zonal price from the last run of the Predispatch Unconstrained schedule) for energy. The report looks backward for 60 days to ensure that any price changes are captured in the report.

Data from previous days, up to 12 months into the past (or up to Market Commencement), are available and can be accessed via the IESO Reports site.

Last Updated Apr 18, 2002
Publishing Frequency Daily at 6:30 EST
Sample csv

Daily TR Historical Interface Flow, Schedule and TTC Report

This report enables you to view, in a daily format, the actual hourly average Schedules and Flows as a result of scheduled and off market transactions between Ontario and an intertie zone. (Negative values denote flows into Ontario).

The report also enables you to view the Total Transfer Capability (TTC) used for determining the maximum import / export market schedules between Ontario and an Intertie Zone. (TTC IN refers to flows from the external Intertie zone into Ontario). The report looks backward for 60 days to ensure that any price changes are captured in the report.

This report can be accessed through the user interface of the IESO Web site for the previous 3 days of data. Data from previous days, up to 12 months into the past, are available from the IESO Reports site.

Last Updated Apr 18, 2002
Publishing Frequency Daily at 6:30 EST
Sample html

Monthly TR Historical Interface Flow, Schedule and TTC Report

As with the daily report, this report enables you to view, in a monthly format, the actual hourly average Schedules and Flows as a result of scheduled and off market transactions between Ontario and an intertie zone. The report looks backward for 60 days to ensure that any price changes are captured in the report.

Data from previous days, up to 12 months into the past (or up to Market Commencement), are available and can be accessed via the IESO Reports site.

Last Updated Apr 18, 2002
Publishing Frequency Daily at 6:30 EST
Sample csv

Pre Auction MCP Report

This report enables the TR Participant to view the Market Clearing Price at which each TR sold during all TR auction rounds held in the previous 18 months (or until market opening).

This report can be accessed through the user interface of the IESO Web site until the start of the TR period of validity.

Last Updated Apr 18, 2002
Sample html

Pre Auction TTC Report

This report enables you to view the forecast of TTC used to determine the number of TRs that will be offered and the maximum number of TRs that may be available. The report also contains a link to the detailed TTC assessments used to identify any assumptions and applicable constraints that can limit the number of TRs that can be awarded.

This report can be accessed through the user interface of the IESO Web site until the start of the TR period of validity.

Last Updated Apr 18, 2002
Sample htm

Revenue Metering

Loss Equations, Administration of Losses (GDE-184)

This document describes how loss equations (fixed loss factors and loss coefficients) are applied to specific service points within the IESO’s Meter Data Management (MDM) system.


Last Updated Mar 31, 2017
Document pdf

Implementation Guide for EDI-867 Meter Data (GDE-139)

This document describes the EDI-867 meter data file format.

Last Updated Sep 9, 2015
Document pdf

Importing and Reading the IESO EDI-867 Meter Data File (GDE-140)

This is a new document to describe how to import and read the IESO EDI-867 meter data file.

Last Updated Mar 2, 2016
Document pdf

EDI-867 Sample File 1

This is a new sample file that represents the meter data a market participant can expect to see when an EDI-867 file is produced by the Meter Data Management System and published to the IESO Reports Site.

Last Updated Sep 9, 2015
Sample edi

EDI-867 Sample File 2 with DTM Flags

This is a new sample file that represents the meter data (with date/time stamps included) a market participant can expect to see when an EDI-867 file is produced by the Meter Data Management System and published to the IESO Reports Site.

Last Updated Sep 9, 2015
Sample edi

Meter Trouble Reporting

Application Status Tool: A User Guide (IMP_GDE_0103)

This document is a guide to the use of the Applications Status tool for IESO interactive workflow applications.

Last Updated Dec 7, 2005
Document pdf

Meter Trouble Report: A Guide for Market Participants (IMP_GDE_0098)

This document is a guide for market participants to the use of the Meter Trouble Report workflow application.

Last Updated Sep 21, 2005
Document pdf

Commercial Reconciliation

Format Specifications for Settlement Statement Files and Data Files (IMP_SPEC_0005)

This Technical Interface document describes the format of settlement statement files and supporting data files.


Last Updated Mar 2, 2017
Document pdf

Format Specification for Demand Response Settlement Data Files (SPEC-142)

The file format specification deals with the data file report that a DR customer may receive.

Last Updated Oct 20, 2016
Document pdf

HST Guide for IESO Transactions (IMO_GDE_0002)

This document provides an overview of the operation of the HST in the IESO administered markets.


Last Updated Mar 1, 2017
Document pdf

Participant Transmission Tariff Data Files (IMP_SPEC_0006)

This file format specification deals with the data file that a Transmission Customer may use for the purpose of validating the energy measurements used by the IESO to determine transmission tariff billing demands.

Last Updated Sep 10, 2008
Document pdf

Transmitter Transmission Tariff Data Files (IMP_SPEC_0007)

This file format specification deals with the data file that the Ontario transmitters may use for the Purpose of validating the energy measurements Used by the IESO to determine transmission tariff billing demands.

Last Updated Sep 12, 2012
Document pdf

Transmitter Reconciliation Data File (IMP_SPEC_0008)

This file format specification deals with the data file required to enable the Ontario transmitters to reconcile the bases for transmission tariff credits.

Last Updated Sep 10, 2008
Document pdf

Transmission Tariff Peak System Demand Data Report (IMP_REP_0016)

The Peak System Demand Data Report provides the sum of the hourly measurements across all delivery points defined for transmission network charges for each Trading Date / Hour in the reporting month.

Last Updated Sep 12, 2012
Document pdf

IESO Charge Types and Equations (IMP_LST_0001)

This document enumerates the various charge types and equations used in the IESO Settlements process for IESO-Administered markets which are subject to a functional deferral and those that are NOT subject to a functional deferral.


Last Updated Mar 1, 2017
Document pdf

Physical Market Preliminary Statements

Published on the 10th Business day for each trading day.

Last Updated Dec 10, 2008
Sample txt

Physical Market Final Statements

Published on the 20th Business day for each trading day.

Last Updated Dec 10, 2008
Sample txt

Physical Market Preliminary data file

Published on the 10th Business day for each trading day.

Last Updated Jun 9, 2006
Sample txt

Physical Market Final data file

Published on the 20th Business day for each trading day.

Last Updated Jun 9, 2006
Sample txt

Financial Market Preliminary Statements

Published on the 2nd Business day for each trading day.

Last Updated Nov 20, 2000
Sample txt

Financial Market Final Statements

Published on the 6th Business day for each trading day.

Last Updated Nov 20, 2000
Sample txt

Participant Transmission Tariff Data Files

Sample of the Transmission Tariff related data files published to market participants and transmitters for reconciliation of Transmission Tariff related charges. These are Published with Preliminary information on the 10th business day after the month end trade date to be followed by a Final edition on the 20th business day.

Last Updated Jun 4, 2003
Sample txt

Transmitter Transmission Tariff Data File

Sample of the Transmission Tariff related data files published to market participants and transmitters for reconciliation of Transmission Tariff related charges. These are Published with Preliminary information on the 10th business day after the month end trade date to be followed by a Final edition on the 20th business day.

Last Updated Jun 4, 2003
Sample txt

Transmitter Reconciliation Data File

Sample of the Transmission Tariff related data files published to market participants and transmitters for reconciliation of Transmission Tariff related charges. These are Published with Preliminary information on the 10th business day after the month end trade date to be followed by a Final edition on the 20th business day.

Last Updated Nov 22, 2004
Sample txt

Transmission Tariff Peak System Demand Report

Sample of the Transmission Tariff related data files published to market participants and transmitters for reconciliation of Transmission Tariff related charges. These are Published with Preliminary information on the 10th business day after the month end trade date to be followed by a Final edition on the 20th business day.

Last Updated Nov 11, 2004
Sample htm

Funds Administration

Text Invoice File Format Report Format (IMP_REP_0049)

This document describes the formats of the Market Participant invoices.

Last Updated Mar 2, 2016
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Financial Market Invoices (Accessed via the IESO Reports Site)

This sample of a Financial Market Invoice produced for participating Market Participants for each Financial Market Billing cycle. The invoice details the credits an debits for the market participant on a charge type basis.

Last Updated Mar 3, 2016
Report Period Billing Period
Sample xml

Statements of Activity

This sample of the monthly Statement of Activity, published for market participants, summarizes all invoice and payment activity for the month.

Last Updated Mar 3, 2016
Publishing Frequency Monthly
Report Period Calendar Month
Sample xml

Physical Market Invoices (Accessed via the IESO Reports Site)

This sample of a Physical Market Invoice produced for participating Market Participants for each Physical Market Billing cycle. The invoice details the credits an debits for the market participant on a charge type basis.

Last Updated Mar 3, 2016
Report Period Billing Period
Sample xml

XML and Automated Documents

XML - A Quick Primer (IESO_GDL_0028)

A document to provide participants with a simple overview of XML Reporting.

Last Updated Sep 12, 2007
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Viewing XML documents in Excel (IESO_GDE_0181)

This guide describes how to view XML documents in Excel 2003.

Last Updated Mar 9, 2005
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Automated Documents (STD-2)

This document defines the standards applicable to the production of IESO automated documents.

Last Updated Mar 25, 2015
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Outbound Automated Document, Application Programming Interface (IMO_SPEC_0100)

This document presents and describes the application programming interface (API) for automating retrieval of XML reports published by the IESO.

Last Updated Aug 12, 2015
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Shared components of Schema model for XML reports that reference old IMO domain.

Sample file intended to allow report users to set up their XML parser for receiving the following IESO reports: - Intertie Schedule and Flow Report - Generators Output and Capablity Report - Hourly Ontario Energy Price (HOEP) Report - Dispatch Advisory Report

Last Updated Dec 10, 2003
Sample xsd

Shared XML Schema

Common Schema for al XML reports in service after June 1st, 2006.

Last Updated Jun 7, 2006
Sample xsd

IESO Reports API Guide

Access Interfaces for Confidential Reports

This document presents and describes the application programming interface (API) and SFTP for automating retrieval of confidential reports published by the IESO.

Last Updated Apr 13, 2015
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