The electricity transmission licensee that owns and maintains the onshore electricity transmission assets in England and Wales. Until 1 April 2019, NGET was also the system operator (SO) for Great Britain. It is a subsidiary company of National Grid plc, a wider group of companies which have interests in interconnection and offshore transmission investments, among other things. For more information, see Practice note, Electricity industry: overview.

For information on the separation of NGET's transmission owner role and system operator role, see Practice note, National Grid: splitting system operator and transmission owner roles.