The GB Distribution Code
All DNOs currently operate the same version of the Code, and the Code is maintained by the Distribution Code Review Panel. All modifications to the Code have to be approved by Ofgem.
Issue 31: Published May 16 2018
This version of the Code has been revised to allow for compliance with the European Network Code Requirements for Generators achieved by the introduction of two new Engineering Recommendations (EREC) G98 and G99. Click on the relevant link for a copy of the new EREC G98 or EREC G99
Please note: Distribution Code Issue 31 is effective from 17 May 2018 and replaces Distribution Code Issue 30
Please note that the Distribution Code, G98 and G99 are incorrect instating that compliance is required from 17 May 2019. The actual effective date when compliance is required is 20 days earlier - ie 27 April 2019. We will update all three documents as soon as possible - but this is a formal process requiring approval by Ofgem. We will aim to do this as soon as possible.
Click here to download a copy of Distribution Code Issue 31
For previous versions of the GB Distribution Code click here
Distribution Code User Guide
The guide gives a high level overview of the Distribution Code, and is aimed at anyone with an interest in the Distribution Code. It contains information about the regulatory structure in Great Britain and Europe and also provides a simple explanation of the various sections of the Distribution Code.
Click here to download the current version of the GB Distribution Code User Guide
Annex 1 and Annex 2 Documents
Some requirements of the Distribution Code are implemented through other industry documents. They are listed in Annex 1 of the Distribution Code, and are mostly Engineering Recommendations. These documents typically cover certain technical areas in detail, such as connection of generation, switchgear ratings and supply quality planning limits.
There are other industry documents which are not implemented via the Distribution Code, but do have a material impact on distribution network users. These are listed in Annex 2 of the Distribution Code.
Standards and other documents referenced in Annex 1 and Annex 2 of the Distribution Code are available for free and can be downloaded at the following link:
Click here for Annex 1 and Annex 2 documents
Standard Governance Procedure
DNOs or Users may bring proposals for modifications to Annex 1 Standards and Annex 2 Standards for consideration by the DCRP Panel. DNOs and Users bringing forward proposals for modifications to Annex 1 Standards and Annex 2 Standards shall set out in general terms the aims of their proposal and the likely impact, including costs.
Further information on how to submit a modification can be found here.
Association for Decentralised Energy (formerly the Combined Heat & Power Association)
Association of Meter Operators
Department for Business, Energy & Industrial Strategy (formerly DECC)
Major Energy Users’ Council
Meter Operation Code of Practice Agreement (MOCOPA)
Microgeneration Certification Scheme
The Grid Code
Renewable Energy Association
Solar Trade Association
Sustainable Energy Association (formerly Mircropower Council)