Smart meter interoperability and interchangeability in Europe

Smart meter interoperability and interchangeability in Europe

by Willem Strabbing - ESMIG Managing DirectorWillem Strabbing, Managing Director

To stimulate the roll-out of Smart Meters across Europe, ESMIG supports the initiatives intended to improve the interoperability of components. ESMIG has adopted a set of open standards (originating in the European Commission) to which members’ products must comply. These standards will allow the competitive development of applications from various sources, creating business models for industry stakeholders, including consumers.

Complying with open standards is a basic condition, but in itself not sufficient to achieve the interoperability required. International standards leave room for further configuration to function within various architectures of EU member states. This document describes the additional measures needed, such as the selection of technologies, definition of optional features and process of data exchange between the Advanced Metering Infrastructure (AMI) components. ESMIG proposes to position such standards in a pyramid with unified standard data models at the top and various alternative technologies (such as RF and PLC technology standards) at the base.


The Smart Meter Coordination Group (SMCG) that acts on the M/441 mandate, defines interoperability as the ability of a system to exchange data with other systems of different types. We define interchangeability as the ability to exchange one device with another without reducing the original functionality.

To achieve interchangeability, several extra conditions must be met beyond the conditions for interoperability. Interchangeability requires devices to support the same functional behaviour on their communication interfaces or allow changes in functionality to be supported by the relevant communication protocol. This document describes the different degrees of interoperability that can be achieved, of which interchangeability would be the highest.

ESMIG believes that to achieve interoperability, interfaces between components of the AMI, provided by ESMIG members, shall be based on open standards i.e. those based on the European Commission’s own definition of open standards as part of the final version 1.0 of the European Interoperability Framework, and is adopted by ESMIG.

Interoperability, 1st degree

To achieve interoperability, it is often not sufficient or suppliers of meters, components etc just to meet agreed EU communications standards. Such standards are intended to apply to various architectures used across Europe. These standards often contain a wide range of functions, options and free data fields, which are not necessarily always used. To ensure a first degree of interoperability, project specific companion specifications will be required, which specify the required standards and how to use free data fields.

Communication standards typically comprise three main elements:

  • Lower protocol layer standards, generally for the physical and data link layers.
  • Higher protocol layer standards, for network, transport and applications layers.
  • Data model standards that define element structures recognised in utility systems.

The choice of upper protocol layer standards and data model can be made on both regional and international levels. Lower layer standards can be made on national or project levels. Interoperability will of course be confined to the same respective level. The most practical situation would be to define a "pyramid" of standards: the top layer for the data models; some in the middle for data formatting and transaction definitions; and several at the bottom to define the use of various technologies on different (wired and wireless) communication media.

Interoperability, 2nd degree

As indicated above, in order to reach the 1st degree of interoperability, additional companion specifications should clearly show for all layers how to use options and free fields in the base standards. In order to reach a second and final level of interoperability and interchangeability, it is necessary to specify what behaviour is expected in both normal conditions and under error conditions. This behaviour can be laid down in Functional Requirement Specifications based on Use Cases or other types of specification formats.


  1. The basis of the ESMIG approach is the definition of open standards to which we adhere. Members’ products will comply with this definition.
  2. ESMIG fully supports international standardisation up to the level that is needed to reach real interoperability.
  3. The communication standards will be positioned in a pyramid of standards with unified standard data models on top and various alternative technology standards at the bottom.
  4. The approach towards interoperability will be phased and covers both international and national levels.


Notes for editors:


The European Smart Metering Industry Group (ESMIG) is the European industry association that provides knowledge and expertise on Smart Metering and related communications at a European level. ESMIG's members are the leading companies in the European Smart Metering Market: meter manufacturers, IT companies, communications product and service providers and system integrators. ESMIG covers all aspects of Smart Metering, including electricity, gas, water and heat measurement. Member companies cover the entire value chain from meter manufacturing, software, installation and consulting to communications and system integration. By giving support to European Union Institutions, Member States and Standardisation Organisations, the industry group aims to assist in the development of national and European-wide introduction, roll-out and management of Smart Metering solutions.

ESMIG is an Official Associate of the Sustainable Energy Europe Campaign:  

For further information contact:

ESMIG Secretariat

Phone: +32 2 7068257, Fax: +32 2 7068250


European Smart Metering Industry Group

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