SEC v26.0 implemented to support the DCC SMETS1 service

24 November 2020

An updated version of the SEC came into effect on 24 November 2020 to implement a Designation by the Department for Business, Energy and Industrial Strategy (BEIS). This is to support the Data Communications Company’s (DCC’s) Smart Metering Equipment Technical Specifications (SMETS) 1 service.

The BEIS designation letter and accompanying annexes which include the redlining can be found here.


SMETS1 PPMID firmware updates

Changes have been made to support the update of firmware for Initial Operating Capability (IOC) and Middle Operating Capability (MOC) SMETS1 Prepayment Interface Devices (PPMIDs) so that if issues are encountered in production, the PPMID software can be updated remotely without disruption to the consumer.


Secure Device-specific S1SR changes

Changes have been made to SEC Appendix AM ‘SMETS1 Supporting Requirements’ (S1SR) to describe Device specific behaviours for MOC Secure Devices. These changes also define the configuration requirements specific to Devices that are planned to be enrolled into the DCC’s network.


What parts of the SEC were affected?

  • SEC Appendix AB ‘Service Request Processing Document’
  • SEC Appendix AD ‘DCC User Interface Specification’ v3.0
  • SEC Appendix AD ‘DCC User Interface Specification’ v3.1
  • SEC Appendix AM ‘SMETS1 Supporting Requirements’


The redlined changes for SEC Appendix AB can also be found on CodeWorks via the links below:


Our Document Log lists the versions of each SEC document now in effect following this release. This will be updated shortly.

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