Publication of ARA-Group company with listed debt

7 August 2017

National Grid plc ('National Grid' or 'NG')

NGG Finance plc

Publication of Annual Report and Accounts - Group Company With Listed Debt

In June 2017, in accordance with Listing Rule 9.6.1, National Grid confirmed it had issued its Annual Report to shareholders and had made them available for public inspection at the UK Listing Authority's document viewing facility - the National Storage Mechanism (NSM) - situated at:

www.morningstar.co.uk/uk/NSM

We confirm that the Annual Report in respect of NGG Finance plc (a NG Group subsidiary company with listed bonds) has been issued to shareholders.

In accordance with Listing Rule 17.3.1, we confirm that a copy of the Annual Report for NGG Finance plc has also been submitted to and will shortly be available for public inspection at the NSM.

The above document is also available electronically on the NG website at:

www.nationalgrid.com

Contact: Alice Morgan, Assistant Company Secretary (020 7004 3228)