FY2026 EBITDAF guidance upgraded to $1.05b

Mercury announced today that it has upgraded its FY2026 EBITDAF guidance from $1.0b to $1.05b. This reflects disciplined portfolio management and higher forecast renewable generation from hydro and new generation. Guidance may change and remains subject to any material events, significant one-off expenses or other unforeseen circumstances including changes to hydrological conditions. 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