Distribution Code for Northern Ireland

The Distribution Code is designed to permit the development, maintenance and operation of an efficient, co-ordinated and economical distribution system and generally to facilitate competition in the generation and supply of electricity.

   Distribution Code - Issue 4

This code establishes the rules governing the operation, maintenance and development of the distribution system and sets out the procedures for governing the actions of all distribution system users.

In accordance with the code NIE Networks has established and maintains a Distribution Code Review Panel that reviews and makes amendments to the code as necessary.

Distribution Code - Issue 4 Notes

This version of the code includes amendments made to Generator interface protection settings which now apply to Small Scale Generation, effective from 11 May 2018. These amendments are detailed in the following consultation response document:

Setting Schedules 

Setting Schedules accompany the Distribution Code providing additional technical detail. These documents are considered part of the Distribution Code and fall under the governance of the Distribution Code Review Panel.

The SSG Setting Schedule applies to Power Stations with a registered capacity from 100kW to under 5MW, and it has been updated to align references to paragraph numbers in D-Code Issue 4.
   SSG Setting Schedule

Current Consultations

RfG Consultations

This NIE Networks public consultation is seeking views from stakeholders on the proposed modifications to the Distribution Code and the new Annex 1 documents EREC G98/NI, EREC G99/NI and the PPM Setting Schedule which together implement the European Union (EU) Network Code Requirements for Generators (RfG) in accordance with the Commission Regulation (EU) 2016/631.
Responses should be submitted to NIE Networks at david.hill@nienetworks.co.uk before 5pm on 15 February 2019.

This public consultation document is produced by NIE Networks in its role as the Distribution Network Operator in Northern Ireland.

NIE Networks is issuing this consultation document on the changes required to the Distribution Code and associated documents in the interest of transparency and to ensure that NIE Networks has the best information available to it to submit an appropriate set of recommendations to the Utility Regulator for the proposal of requirements of general application.


A consultation on proposals for implementing Significant Grid User (SGU) Key Organisational Requirements, Roles and Responsibilities (KORRR) relating to Data Exchange – Northern Ireland, is commencing today 25 January 2019. This is in accordance with Article 40(6) of the Commission Regulation (EU) 2017/1485 of 2 August 2017 establishing a guideline on electricity transmission system operation.
This consultation is hosted jointly by SONI in its role as the Transmission System Operator in Northern Ireland and NIE Networks in its role as the Distribution Network Operator in Northern Ireland. EirGrid in its role as the Transmission System Operator in Ireland and ESB Networks in its role as the Distribution System Operator in Ireland are holding a similar consultation with SGUs in Ireland.

The consultation paper for Northern Ireland is published in the European Integration Section of the SONI website.  Please scroll to the ‘Publications’ section.

Please note a separate consultation for Ireland also commenced today. This is published on the EirGrid website. Customers should respond to one or both depending on their interests.
Responses to the consultation should be sent to gridcode@soni.ltd.uk by 17h00 on 25 February 2019.  For your convenience, a response template is available in the ‘Publications’ section.  

Please email your submission with the subject title “KORRR SGU Consultation”.  We look forward to receiving your feedback and using it to improve our proposal.


Previous issues

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