Standard Transfer Specification Association
Standard Transfer Specification Association

The Standard Transfer Specification is the global standard for the transfer of electricity and other utility prepayment tokens, ensuring inter-operability between system components from different manufacturers.

What is the STS?

The Standard Transfer Specification (STS) describes a secure message system for carrying information between a point-of-sale and a meter, and is currently finding wide application in electricity metering and payment systems.

Product Certification

All products that are required to display the STS logo must be certified by a STS accredited test house. Read more on the certification process or view the list of Certified Products.

Key Management Services

The Key Management Centre allocates, generates, and safely stores all vending keys for the STS based systems around the world. Click here to access the KMC forms


The members of the association are companies and utilities involved in the manufacture, supply or operation of STS based systems. Membership can be obtained by signing our membership agreement and paying the prescribed joining and annual membership fees.

STS Edition 2

The latest edition of the specifications, STS Edition 2, not only maintains backward compatibility to the current systems in use, but more importantly, it enables the use of the latest state of the art cryptographic algorithms, while also introducing many new features in order to keep abreast with modern smart metering technologies.  Watch Now!

Manufacturer Codes

Paid up members of the association can acquire a Manufacturer Code if they have metering products that are ready for compliance certification. The Manufacturer Code is a unique four digit numerical code that you need to encode into your product firmware before compliance testing can commence.

How to Implement STS

This section is for Members and Non-Members alike. Here you will go through the Step-by-Step guides on how to benefit from the wide range of features that STS offers.

STS Videos

Click here for the STSA video gallery, where you’ll discover everything you need to know about understanding STS, the TID rollover,  STSA board updates, STS Technical Training, and much more.

Technical Support

Technical, Key Management, Membership and Administrative support contact details.