SEC v54.0 implemented to support the DCC SMETS1 service

17 December 2021

On 17 December 2021, an updated version of the SEC came into effect to designate SEC Appendix AT ‘SMETS1 Cryptographic Key Management Policy’ along with consequential changes to SEC Section A ‘Definitions and Interpretation’. Also, SEC Appendix AM ‘SMETS1 Supporting Requirements’ has been re-designated. This is in support of the Data Communications Company (DCC) Smart Metering Equipment Technical Specifications (SMETS) 1 service.


Summary of changes

As required by SEC Section L ‘Smart Metering Key Infrastructure and DCC Key Infrastructure’ 14.8, the DCC has consulted on a draft of the SMETS1 Cryptographic Key Management Policy (the “Policy”) as well as on corresponding changes to the SMETS1 Supporting Requirements (to reflect the proposed position on key rotation in the Policy). The Policy was approved by the Smart Metering Key Infrastructure (SMKI) Policy Management Authority (PMA) prior to the consultation. The Policy has now been designated into the SEC as Appendix AT.

Changes have also been made to the SMETS1 Supporting Requirements to make provisions for Device specific behaviours in relation to the Initial Operating Capability (IOC), Middle Operating Capability (MOC) and Final Operating Capability (FOC) cohorts that have arisen out of testing.

The designation letter and associated redlining can be found here.


What parts of the SEC were affected?

  • SEC Section A ‘Definitions and Interpretation’
  • SEC Appendix AM ‘SMETS1 Supporting Requirements’
  • SEC Appendix AT ‘SMETS1 Cryptographic Key Management Policy’


Where can I access the legal text?

The redlined changes for Section A are also available on CodeWorks via the links below:


Our Document Log lists the versions of each SEC document now in effect following this release.

You can download the individual SEC documents from the SEC and Supporting Documents section of our website or via CodeWorks.


Where can I find further information?

If you have any questions, you can call the SECAS Helpdesk at 020 7090 7755 or email