SEC v34.0 published for the February 2021 SEC Release

25 February 2021

SEC version 34.0 came into effect on 25 February 2021 to implement the February 2021 SEC Release. This included two Modification Proposals:


Summary of changes

MP092 will incorporate the DCC’s new approach for the delivery of Planned Maintenance, which uses a risk-based methodology to categorise planned changes as either Low Impact or High Impact.

MP122A will facilitate the changes to the DCC Technical Operations Centre (TOC) and DCC operational processes in order to report on several new and improved metrics recommended in the Operational Metrics Review (OMR), commissioned by the Operations Group. The enhanced reporting will not commence until May 2021, with reporting looking at data from April 2021.


What parts of the SEC were affected?

  • Section A ‘Definitions and Interpretation’
  • Section H ‘DCC Services’
  • Appendix AL ‘SMETS1 Transition and Migration Approach Document’ (not currently available on CodeWorks)


Where can I access the legal text?

The redlined changes for the documents available on CodeWorks can be found via the links below:


The redlining for SEC Appendix AL, resulting from MP092, can be found here.

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

You can download clean versions of 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