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Conforming Meter List

The Market Rules require each metering installation used for IESO settlement purposes to be on the list of conforming meters established by the IESO. Meters on the Conforming Meter List are permitted to be used as the "main" or "alternate" meter, provided that all applicable conditions of acceptance are met.

To be on the Conforming Meter List, these requirements must be met:

  • The IESO standard Wholesale Revenue Metering Standard - Hardware contains a description of the functions for each of the "main" and "alternate" meters that must form part of a metering installation

  • Market Rules and the policies and standards established by the IESO, including the IESO standard Wholesale Revenue Metering Standard - Hardware, describe the accuracy and other requirements for meters and metering installations

  • Sample tested by the IESO to verify that the meters are by design compatible with the IESO's metering communication facilities and software

Metered Market Participants and Metering Service Providers are solely responsible for ensuring that their metering installations comply in all respects with the applicable provisions of the Market Rules and of any policy or standard established by the IESO pursuant to the Market Rules, including sealing by an accredited meter verifier and containing meters obtained from a manufacturer that has obtained approval of type from Measurement Canada.  

Inclusion of a meter on the Conforming Meter List attached does not represent or warrant that any individual meter is accurate or complies fully with the requirements of the Market Rules or of any such policy or standard. The IESO reserves the right to:

  • Refuse registration of a metering installation in the event of non-compliance with the Market Rules or any such policy or standard; and
  • Take such other action as may be permitted by the Market Rules in respect of a non-compliant metering installation even if the metering installation contains meters that are on the list attached.  

Meters Conforming to the Requirements of the IESO Market

Last Updated: December 22, 2016


The following list specifies the first character of the internal identification number (device I.D.) assigned for each meter manufacturer. When programming meters, these conventions must be followed for all accepted meters on the Conforming Meter List.

Meter Manufacturer Assigned Character
Elster Metering and ex-ABBA
GE Canada Inc.G
Schneider Electric/PMLP
Itron Canada, ex-SchlumbergerSema and ex-SchlumbergerS

The contents of these materials are provided "as is" without any warranties of any kind and the Independent Electricity System Operator (IESO) makes no representation and disclaims all express and implied warranties and conditions of any kind, including without limitation, representations, warranties or conditions regarding accuracy, timeliness, completeness, non-infringement, merchantability or fitness for any particular purpose and the IESO assumes no responsibility to you or any third party for the consequences of any errors or omissions. The IESO is not liable to the reader of these materials for any revisions of these materials or to any third party for any damages of any kind arising out of or relating to the use of this material including, but not limited to, any lost profits, lost opportunities, special, incidental, indirect, consequential or punitive damages, even if the IESO is advised of such possibility. These are conditions of access to these materials. This disclaimer is subject to the Market Rules made pursuant to the Electricity Act, 1998.