Network and infrastructure

We own the national electricity transmission system in England and Wales. The system consists of approximately 4,500 miles of overhead line, over 900 miles of underground cable and over 300 substations.


Network route maps

Find out the approximate location of our electricity transmission network and check the safety implications of your works.

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Working near our assets

Access guidance and support for working near our electricity transmission assets, including overhead lines and underground cables.


Landowners, occupiers, and grantors

Get in touch if you have any questions about electricity equipment maintenance or refurbishment plans in your area, or need information about compensation and reinstatement.


Planning and development

Find electricity-related guidance for national, regional, and local planning authorities and other statutory consultees.

Enquiries about working near our assets

If you have any questions or need more information about working near our network assets, please contact the National Grid Asset Protection team or submit an enquiry via the Line Searchwebsite.

Phone: 0800 001 4282 (Asset Protection)

Email: [email protected]

For domestic enquiries, such as metering or power cuts, more information can be found on the National Grid ESO website.

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Network Access Policy

National Grid Electricity Transmission’s Network Access Policy (NAP) is written to facilitate collaboration between Transmission Owners, National Grid Electricity System Operator (NGESO) and other stakeholders.

The Network Access Policy is designed to deliver value for consumers in relation to the planning, management and operation of the electricity transmission system in Great Britain.

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