Annual Report - Group Companies With Debt

22 September 2015

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

National Grid USA

National Grid North America Inc.

Publication of Annual Reports and Accounts - Group Companies With Listed Debt

In June 2015, 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 USA

National Grid North America Inc.

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: David Whincup, Assistant Company Secretary (020 7004 3209)