TECO Electric: Announcement of Ex-Dividend Record Date Resolution by the Company's Board of Directors

1. Date of resolution by the Board of Directors, Shareholders' Meeting, or company decision: 2026/05/12 2. Type of ex-rights/ex-dividend (please fill in "ex-rights", "ex-dividend", or "ex-rights and ex-dividend"): Ex-dividend 3. Type and amount of ordinary share dividend distribution: Ordinary share cash dividend of NT$4,752,881,368 (NT$2.0 per share) 4. Ex-dividend (or ex-rights) trading date: 2026/06/17 5. Last day for transfer registration: 2026/06/18 6. Start date for suspension of transfer registration: 2026/06/19 7. End date for suspension of transfer registration: 2026/06/23 8. Ex-dividend (or ex-rights) record date: 2026/06/23 9. Last day for bond conversion application: Not applicable 10. Start date for suspension of bond conversion: Not applicable 11. End date for suspension of bond conversion: Not applicable 12. Cash dividend payment date for ordinary shares: Cash dividend payment date is tentatively scheduled for 2026/07/15 13. Other matters that should be specified: None