National Grid plc and National Grid Electricity Transmission plc have published a Supplementary Prospectus, which has been approved by the Financial Conduct Authority. The Supplementary Prospectus supplements the prospectus dated 27 July 2023 for the National Grid plc and National Grid Electricity Transmission plc Euro 20,000,000,000 Euro Medium Term Note Programme. The Supplementary Prospectus should be read in conjunction with the Prospectus. The full Supplementary Prospectus can be viewed at the provided URL. A copy of the Supplementary Prospectus will also be available for public inspection at the National Storage Mechanism. For further information, contact Kwok Liu, Deputy Treasurer, Funding & Investment at National Grid plc, or Lyndsey Evans, Corporate Communications at National Grid plc. The information contained in the Prospectus is intended for residents of specific countries and should not be relied upon by individuals outside of these countries unless they are part of the intended addressees.