SEC v42.0 implemented to support the DCC SMETS1 service

21 July 2021

On 20 July 2021, an updated version of the SEC came into effect to implement a designation made by the Department for Business, Energy and Industrial Strategy (BEIS). This is in support of the Data Communications Company (DCC) Smart Metering Equipment Technical Specifications (SMETS) 1 service.


Summary of changes

SMETS1 Transition and Migration Approach Document (TMAD)

The amendments to the TMAD are to support the migration of “split supply”, where there are different Responsible Suppliers for gas and electricity meters at the same site, and to enable profile data on the Communications Hub to be provided to Users.


SMETS1 Supporting Requirements (S1SR)

The amendments to the S1SR are to make provision for device-specific behaviours in relation to Final Operating Capability (FOC) migrations.


DCC User Interface Specification (DUIS)

The amendments to the DUIS are to allow firmware upgrades on SMETS1 Prepayment Meter Interface Devices (PPMIDs) for FOC Device Model Combinations (DMCs).


Emergency Central Products List (CPL) Entries

The amendments to the CPL Requirements Document are to enable firmware upgrades on SMETS1 Devices where a security vulnerability has been discovered, without causing the Devices to be removed from the Eligible Products Combination List (EPCL). This includes consequential changes to SEC Section ‘Definitions and Interpretation’ and Section H ‘DCC Services’.

The BEIS designation letter and accompanying annexes, including the redlining, can be found here.


What parts of the SEC were affected?

  • SEC Section A ‘Definitions and Interpretation’
  • SEC Section H ‘DCC Services’
  • SEC Appendix Z ‘CPL Requirements Document’
  • SEC Appendix AD ‘DCC User Interface Specification Version 3.0’
  • SEC Appendix AD ‘DCC User Interface Specification Version 3.1’
  • SEC Appendix AD ‘DCC User Interface Specification Version 4.0’
  • SEC Appendix AL ‘Transition Migration Approach Document’
  • SEC Appendix AM ‘SMETS1 Supporting Requirements’


Where can I access the legal text?

The redlined changes for SEC Sections A & H and Appendix Z 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