Connecting a Non-Exporting Generator to the Electricity Network

Non-Exporting (MEC=0) Generators operate in parallel with the electricity distribution system. These generators cannot be used to export electricity onto the electricity network or to supply or sell electricity via the distribution network. 

  • Customers applying to install non-exporting generation must complete an NC5 application form for commercial and technical assessment. The details of this assessment, and any potential uprate works required, will be set out in the customer's connection offer. It is important that customers who are installing embedded generation, non-exporting capacity, read and understand the Conditions Governing Connection to the Distribution System (Download PDF | 1,224 KB), before making an application and refer to the Step-by-step guide at the bottom of this page. 
  • To standardize the method by which customers ensure that they do not export electricity onto the distribution system, a reverse power relay is required to trip either the embedded generation or the customer's facility, details of which will be set out in the connection offer. Please note that witness testing of the relay by ESB Networks will not normally require a ‘switch out’ to confirm relay operation.

SCADA Equipment Requirement: 

  • A relatively recent modification [#36] to the Distribution Code, stipulates that customers installing non-synchronous, embedded generation with a total capacity of  >1MW, are required to be controllable by EirGrid. This necessitates the installation of Supervisory Control and Data Acquisition (SCADA) equipment, which includes Remote Terminal Unit (RTU), Distribution System Operator (DSO) SCADA, Polling  Radio and Batteries. Note that this applies even where there is no export of power from the site.

Step-by-Step Guide


For Connections made after September 2018 some Distribution Code Conditions may change, arising from the need to be aligned with European Network Codes.

European Network Codes

If you wish to connect a generator that is intended to export energy onto the electricity network, please go to Generator Connections

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