Connection of Generation > 3.68kW (G99)
Please note that from 27 April 2019 only equipment compliant with G98/G99 is accepted for connection to the networks due to the European Network Codes Requirements for Generators (RfG) legislation that come into effect.
Engineering Recommendation G99 Issue 1 Amendment 6 (applicable from 6 March 2020)
The ENA EREC G99 Standard Application Form should be used for generation connection applications over 50kW 3-phase or 17 kW single phase as per G99. For type tested generation of 50kW or less 3-phase or 17 kW or less single phase then the G99 form A.1 should be used.
The new ENA EREC G99 connection Standard Application Form covers all the G59 data as well as the G99 data requirements, and should therefore be used for all applications. Whilst the old G59 application form may be used for connection applications where the connection is required before 27 April 2019, the new G99 Standard Application Form should be used for all connection application where the connection is required on or after 27 April 2019. Please note that the ENA G99 Standard Application Form will be the only form that can be used after 27 April 2019 and the G59 Standard Application Form will be no longer accepted.
- EREC G99 Issue 1 Amendment 6 (2020)
- ENA ER G99 Generator Standard Application Form
- EREC G99/1NI - Northern Ireland Only
Requirements for the connection of generation equipment in parallel with public distribution networks in Northern Ireland on or after 27 April 2019
The following 15 forms are appendices from Engineering Recommendation G99 and are made available in word format to download. Once the relevant form or forms have been completed they should be sent to the local DNO or IDNO in your area. Please note the ENA is not able to process these documents. You can find out who your DNO is on our Who is My Network Operator? page
Engineering Recommendation G59 Issue 3 Amendment 6 (applicable from 16 June 2019)
The following five appendices from G59 Issue 3 Amendment 6 (2019) - A13.1, A13.2, A13.3, A13.4 and 13.5 - have been made available in MS Word format and are free to download below. Once connection forms have been completed they should be sent to the DNO in your area. Please note the ENA is not able to process these documents. You can find out who your DNO is on our Who is My Network Operator? page.
- A13.1 Generating Unit Type Test Sheet - Type Tested Generating Unit (>16A per phase but < 50kW three phase or 17kW single phase)
- A13.2 Generating Plant Installation and Commissioning Confirmation
- A13.3 Generating Plant Installation and Commissioning Tests - Commissioning test requirements for non-Type Tested Generating Units in addition to those required in A13.2
- A13.4 Generating Plant Decommissioning Confirmation
- A13.5 Application for connection of Type Tested Generating Units with totals aggregate Power Station capacity < 50kW three phase or 17kW single phase
ERG59 and ERG99 Standard Application Forms
It is possible to connect almost any generation plant to the distribution network. The Data Registration Code of the Distribution Code sets out the obligations on the generator and DNO to exchange data as part of the design process and lists the data items that may need to be exchanged. The purpose of the application forms below is to simplify and clarify this data exchange process.
Engineering Recommendation G59
The ENA ER G59 Generator Standard Applicatio Form is to be used for generation that is over 50kW 3-phase or 17 kW single phase or is classed as non type tested generation as per G59/3-4. For type tested generation of 50kW or less 3-phase or 17 kW or less single phase then the G59/3-4 form A13.5 should be used. Please note that the ENA ER G59 Generator Standard Apllication Form will be no longer applicable after 27 April 2019 and you will need to use the G99 standard application form detailed below.
Please note from July 1 2018 any connections application or products referencing G59/3, G59/3-1, G59/3-2 or G59/3-3 will no longer be acceptable and will not be processed/connected by the Network Operator. Such connection applications/products submitted/used after 1 July 2018 must be in accordance with G59/3-4.
Energy Storage Further Information Request
For more information on Energy Storage please see here