SEC v48.0 implemented to support the DCC SMETS1 service

8 October 2021

On 8 October 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.

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 Appendix Z ‘CPL Requirements Document’
  • SEC Appendix AM ‘SMETS1 Supporting Requirements’


Where can I access the legal text?

The redlined changes for Section A 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