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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 view all relevant documents.

Upcoming changes to these interfaces are listed on the Pending Changes page. Procedural information for each function is included on the Rules & Manuals page.

Show New and Updated Documents Only:

Commercial Reconciliation

GUIDES/MANUALS

Status Document Description Last Updated Link
Updated 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. 12/4/2013 pdf 
Updated HST Guide for IESO Transactions (IMO_GDE_0002) This document provides an overview of the operation of the HST in the IESO administered markets. 12/4/2013 pdf 
Updated 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. 12/4/2013 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 9/10/2008 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. 9/12/2012 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. 9/10/2008 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. 9/12/2012 pdf 

REPORT TEMPLATES & SAMPLES

Status Document Description Last Updated Sample
 Format Specifications for Settlement Statement Files and Data Files Has the following samples  N/A 
 
  • Physical Market Preliminary Statements
 
Published on the 10th Business day for each trading day 12/10/2008 text 
 
  • Physical Market Final Statements
 
Published on the 20th Business day for each trading day 12/10/2008 text 
 
  • Physical Market Preliminary data file
 
Published on the 10th Business day for each trading day 6/9/2006 text 
 
  • Physical Market Final data file
 
Published on the 20th Business day for each trading day 6/9/2006 text 
 
  • Financial Market Preliminary Statements
 
Published on the 2nd Business day for each trading day 11/20/2000 text 
 
  • Financial Market Final Statements
 
Published on the 6th Business day for each trading day 11/20/2000 text 
 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 6/4/2003 text 
 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 6/4/2003 text 
 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 11/22/2004 text 
 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 11/11/2004 html 

Commercial Reconciliation Statements and Files are available to market participants via the Market Participant Interface (MPI).

 

 
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