Publication of a Supplementary Prospectus

Summary by AI ^BETAClose X

NIE Finance PLC has released a supplement to its prospectus, approved by the Financial Conduct Authority, relating to its £2,500,000,000 Euro Medium Term Note Programme, which is guaranteed by Northern Ireland Electricity Networks Limited. This supplement should be read in conjunction with the offering circular dated 17 April 2025. The document is available for viewing and has been submitted to the National Storage Mechanism.

Disclaimer*

16 January 2026

The following supplement to a prospectus (the “ Supplement ”) has been approved by the Financial Conduct Authority and is available for viewing:

Supplement dated 16 January 2026 relating to the £2,500,000,000 Euro Medium Term Note Programme of NIE Finance PLC and guaranteed by Northern Ireland Electricity Networks Limited

The Supplement should be read and construed in conjunction with the offering circular dated 17 April 2025 (the “ Offering Circular ”) relating to the above programme.

To view the full Supplement, please paste the following URL into the address bar of your browser:

NIE Finance - Supplementary Prospectus.pdf

A copy of the Supplement has also been submitted to the National Storage Mechanism and will shortly be made available for inspection at:

https://data.fca.org.uk/#/nsm/nationalstoragemechanism

For further information, please contact:

Ted Browne

Finance & Regulation Director

NIE Networks

07795 496485

Ted.Browne@nienetworks.co.uk

DISCLAIMER - INTENDED ADDRESSEES

Please note that the information contained in the Supplement and the Offering Circular may be addressed to and/or targeted at persons who are residents of particular countries (specified in the Offering Circular) only and is not intended for use and should not be relied upon by any person outside these countries and/or to whom the offer contained in the Offering Circular is not addressed. Prior to relying on the information contained in the Offering Circular you must ascertain from the Offering Circular whether or not you are part of the intended addressees of the information contained therein.

Your right to access this service is conditional upon complying with the above requirement.

Neither this announcement nor the Supplement constitutes an offer of the Notes described in the Offering Circular for sale in the United States. This is not for distribution in the United States. The Notes have not been, and will not be, registered under the United States Securities Act of 1933, as amended (the “ Securities Act ”) and are subject to U.S. tax law requirements. Subject to certain exceptions, Notes may not be offered, sold or delivered, directly or indirectly, in the United States or to, or for the account or benefit of U.S. persons, as such terms are defined in Regulation S under the Securities Act. There will be no public offering of the Notes in the United States.