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SmartGrid Interoperability Standards are available online. Collected here are Smart Grid standards from the Smart Grid Interoperability Panel (SGIP) Catalog of Standards and the NIST Framework and Roadmap for Smart Grid Interoperability Standards, Release 3.0 (pdf link). Given the nature and goal of interoperability, most of the standards presented here are part of both the SGIP and the NIST Framework. For further information, please visit the NIST SmartGrid site.

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ANSI C12. Smart Grid Meter Package

ANSI C12. Smart Grid Meter Package

The ANSI C12. Smart Grid Meter Package provides the requirements and guidance on electricity metering, watt hour meter sockets, device data tables, meter interfacing to data communication networks and type 2 optical ports. ANSI C12. Meter package also establishes performance criteria for thermal demand meters, mechanical demand registers and phase shifting devices used in metering. Test methods for transformer-rated meters and self contained "A" base watt hour meter are included in this package as well as a watt hour safety standard. This package contains all parts of NEMA ANSI C12. ANSI C12.1-2014 NEMA ANSI C12.4:1984 (R2011) ANSI C12.5-1978 (R2012) ANSI C12.6-1987 (R2016) ANSI C12.7-2014 ANSI C12.8-1981 (R2021) ANSI C12.9-2014 (R2021) ANSI C12.10:2011 (R2021) ANSI C12.11:2006 (R2019) ANSI C12.18:2006 (R2016) ANSI C12.20-2015 ANSI C12.21:2006 (R2016) ANSI C12.19-2021 ANSI C12.22-2012 (R2020) NEMA C12.24 TR-2022

ANSI C12.1-2014

Electric Meters - Code for Electricity Metering

This Code establishes acceptable performance criteria for new types of ac watthour meters, demand meters, demand registers, pulse devices, and auxiliary devices. It describes acceptable in-service performance levels for meters and devices used in revenue metering. It also includes information on related subjects, such as recommended measurement standards, installation requirements, test methods, and test schedules. This Code for Electricity Metering is designed as a reference for those concerned with the art of electricity metering, such as utilities, manufacturers, and regulatory bodies.

ANSI C12.18-2006 (R2016)

Protocol specification for ansi type 2 optical port

Details the criteria required for communications between a C12.18 device and a C12.18 client via an optical port. The C12.18 client may be a handheld reader, a portable computer, a master station system, or some other electronic communications device.

ANSI C12.19-2021

Utility Industry End Device Data Tables

Defines a Table structure for utility application data to be passed between an End Device and any other device. It neither defines device design criteria nor specifies the language or protocol used to transport that data. The Tables defined in this Standard represent a data structure that shall be used to transport the data, not necessarily the data storage format used inside the End Device.

ANSI C12.20-2015

Electricity Meters - 0.1, 0.2, and 0.5 Accuracy Classes

Establishes the physical aspects and acceptable performance criteria for 0.1, 0.2, and 0.5 accuracy class electricity meters meeting Blondel's Theorem.

ANSI C12.21-2006 (R2016)

Protocol Specification for Telephone Modem Communication

Details the criteria required for communications between a C12.21 device and a C12.21 client via a modem connected to the switched telephone network. The C12.21 client could be a laptop or portable computer, a master station system or another electronic communications device.

ANSI C12.22-2012 (R2020)

Protocol Specification for Interfacing to Data Communication Networks

Describes the process of transporting C12.19 table data over a variety of networks, with the intention of advancing interoperability among communications modules and meters. Uses AES encryption to enable strong, secure smart grid communications, including confidentiality and data integrity, and is also fully extensible to support additional security mechanisms the industry may require in the future.


As the voice of the U.S. standards and conformity assessment system, the American National Standards Institute (ANSI) empowers its members and constituents to strengthen the U.S. marketplace position in the global economy while helping to assure the safety and health of consumers and the protection of the environment.