Use of Export Limitation Schemes (G100)

Engineering Recommendation G100 (2018) - Technical Guidance for Customer Export Limiting Schemes 

The purpose of this Engineering Recommendation (EREC) is to provide guidance on the connection of customer export limiting schemes (ELS) that operates in parallel with the Distribution Systems of licensed Distribution Network Operators (DNOs). 

The guidance given is designed to facilitate the connection of ELS whilst maintaining the integrity of the distribution system, both in terms of safety and supply quality.

This EREC is intended to provide guidance to Customers planning to use an ELS and to DNOs. 

This document should be read in conjunction with EREC G98 and G99. 

As the cost of generation continues to reduce, many customers are now seeking to increase the amount of generation installed within their premises to offset their import requirements. Where the DNO has assessed that an increase in generation export capacity will require costly or time-bound upstream reinforcement, some customers may choose to restrict the net export from their connection rather than wait for or contribute to the reinforcement.

A typical ELS may be used in the following scenarios:

  • Over-sizing the generation and limiting the peak output
  • Increasing flexibility of on-site demand at times of peak output
  • Guaranteeing a defined export limit 

Engineering Recommendation G100 is available here.  

The following 3 forms are appendices from Engineering Recommendation G100 and are made available in word format to download. Please note ENA does not process these documents. Once the relevant form or forms have been completed they should be sent to the DNO or IDNO you are connected or connecting to. You can find out who your DNO is on our Who is My Network Operator? page

ENA EREC G100 - Appendix A - Information Request

ENA EREC G100 - Appendix B - Export Limitation Scheme Installation and Commissioning Tests

ENA EREC G100 - Appendix C - Manufacturers G100 Product Declaration