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Postcode Checker

Are you in a constraint zone?

Enter the postcode of your flexibility site in the box below. 

Note: this tool can only be used to check EHV postcodes.  You can download an up to date and accurate list of qualifying postcodes for both EHV and LV flexibility zones here.  We also provide  polygon shape files which can be found here.

Note: Postcode data can't always be 100% accurate in relation to our network area boundaries.  Contact us via email nged.flexiblepower@nationalgrid.co.uk to check any sites you are unsure of.

Please enter a valid postcode.

Unfortunately we were unable to retrieve information relating to the postcode.

Sorry, it appears you are not within one of our zones.

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Service Overview:
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