Mercury considers Green Bond offer

Mercury NZ Limited (Mercury) is considering making an offer of up to $200 million (with the ability to accept up to an additional $50 million of oversubscriptions at Mercury’s discretion) of 7 year unsecured, unsubordinated, fixed rate green bonds (Green Bonds) to institutional investors and New Zealand retail investors. It is expected that full details of the offer will be released in the near term, subject to market conditions. Mercury has a corporate credit rating from S&P Global Ratings of BBB+ (stable outlook). The Green Bonds, if issued, are expected to be assigned an issue credit rating of BBB+ by S&P Global Ratings. The proceeds of the Green Bonds are intended to be notionally allocated to finance or refinance eligible projects in accordance with Mercury’s Green Financing Framework dated February 2026. In particular, as at the date of this announcement, Mercury expects to apply the proceeds of the Green Bonds to refinance existing debt. Mercury has appointed Westpac Banking Corporation (ABN 33 007 457 141) (acting through its New Zealand branch) (Westpac) as Arranger, and Bank of New Zealand, Craigs Investment Partners Limited, Forsyth Barr Limited, together with Westpac, as Joint Lead Managers in relation to the offer. There will be no public pool for the offer, with all of the Green Bonds being reserved for clients of the Joint Lead Managers, institutional investors and other primary market participants. Investors can register their interest by contacting a Joint Lead Manager or their usual financial advice provider. Indications of interest will not constitute an obligation or commitment of any kind. No money is currently being sought and no Green Bonds can be applied for or acquired until the offer opens. If the proposed offer is made, it will be made in accordance with the Financial Markets Conduct Act 2013 as an offer of debt securities of the same class as existing quoted debt securities. The Green Bonds are expected to be quoted on the NZX Debt Market. Arranger and Joint Lead Manager Westpac - 0800 772 142 Joint Lead Managers BNZ - 09 924 9602 Craigs Investment Partners - 0800 272 442 Forsyth Barr - 0800 367 227 ENDS Howard Thomas General Counsel and Company Secretary Mercury NZ Limited For investor relations queries, please contact: Paul Ruediger Head of Business Performance & Investor Relations 027 517 3470 investor@mercury.co.nz For media inquiries, please contact: Catherine Morab Reputation and Social Impact Lead 09 282 1158 mercurycommunications@mercury.co.nz