The Distribution Code

Licensed electricity distribution businesses, or Distribution Network Operators (DNOs) in Great Britain, are obliged under Condition 21 of their licences to maintain a Distribution Code. The Distribution Code:

  • covers the technical aspects relating to the connection and use of the electricity distribution licensees’ distribution networks.
  • specifies day-to-day procedures that govern the relationship between a distribution licensee and users of its distribution system for planning and operational purposes in normal and emergency circumstances.
  • is also designed to ensure that the distribution licensee can meet its Grid Code compliance obligations.

Code Administrators are the point of contact for each code where users can find out information about that code, including how to become a party to the code (if appropriate) and the rules on modifying the code. Code Administrators have committed to operating their code administration functions in accordance with the Code Administration Code of Practice (CACoP).

Code Administrators, as part of their role, act as Critical Friends to code users. The role of the Critical Friend is described in CACoP as a Code Administrator who provides support to all with an interest in the code modification process and consumer representatives. The Code Administrators have identified a list of the Top 5 activities of a Critical Friend.

The Code Administrators have developed a Central Modifications Register which details all current modifications across the eleven codes. This spreadsheet is managed by the Code Administrators and updated by them monthly.

ENA acts as the Code Administrator for the Distribution Code of Great Britain. ENA maintains the D Code website (, faciliates meetings of the Distribution Code Review Group (DCRP) and the Industry Technical Codes Group (ITCG), and progresses user issues and modifications as required.

Distribution Code contact:

For more information please contact [email protected].