Annual Report-Group Companies With Listed Debt

13 July 2017

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

National Grid Electricity Transmission plc

National Grid Gas plc

Publication of Annual Reports and Accounts - Group Companies 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 Reports in respect of the following NG Group subsidiary companies with listed bonds have been issued to shareholders.

National Grid Electricity Transmission plc

National Grid Gas plc

In accordance with Listing Rule 17.3.1, we confirm that copies of the above Annual Reports have also been submitted to and will shortly be available for public inspection at the NSM.

Copies of the all the above documents are also available electronically on the NG website at:

www.nationalgrid.com

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