SEC v41.0 implemented to support the DCC SMETS1 service

2 July 2021

An updated version of the SEC came into effect today, 2 July 2021, to implement a designation made by the Department for Business, Energy and Industrial Strategy (BEIS).

This includes an update to the Smart Metering Equipment Technical Specifications (SMETS) 1 Transition and Migration Approach Document (TMAD) to reduce the timeline for submission of Daily Migration Demand values to two weeks and to drive efficiencies in the migration forecasts and in the demand allocation process.

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


What parts of the SEC were affected?

  • SEC Appendix AL ‘SMETS1 Transition and Migration Approach Document’


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