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Export Limitation

    Customers who are seeking to increase the amount of generation or energy storage installed but have been advised an increase in export capacity will require costly or time bound upstream reinforcement, may choose to restrict the net export of their connection rather than wait for or contribute to the reinforcement.

    An export limitation scheme measures the Apparent Power (kilowatts) at the exit point of the installation and then uses this information to either restrict generation/energy storage output or increase the customer demand in order to prevent the Agreed Export Capacity from being exceeded.

    These schemes allow network operators to continue to maintain the supply security of existing customers whilst also enabling new generation/energy storage onto the network.

    Requirements for Customer Export Limited Connections:

    Hardware

    Export Limitation Schemes must comply with the relevant power quality standards and with ER G100. Generation, including energy storage systems, also needs to adhere to ER G98 and G99 as applicable. 

    • The export limitation scheme must reduce the exported Active Power to a value that is equal to, or less than, the Maximum Export Capacity within 5s;
    • The system must be fail-safe. If any of the components or signalling systems that comprise the export limitation system fail or lose power the scheme must reduce the exported Active Power to a value that is equal to, or less than, the Maximum Export Capacity within 5s.

    Connection Process

    The installer must fill in and submit an Export Limitation Scheme Application form to National Grid (NG) in addition to the relevant generation application forms. 

    • Once NG has approved the connection the equipment may be installed and comissioned. In some cases NG will need to witness some of these comissioning tests. 
    • The installer must fill in an Export Limitation Installation and Comissioning form and submit this to NG within 28 days. 
    • A G99 Fast Track application process has been developed for single phase installations that comprise ER G98 compliant generation (e.g. solar PV) rated up to 16A and ER G98 compliant energy storage rated up to 16A fitted with an ER G100 compliant Export Limitation Scheme that restricts the export to 16A per phase or less. Further information on the G99 Fast Track process is available here. 

     

    Additional Information 

    Export Limiation Application Form 

    Export Limitation Installation Comissioning Form