Huaneng Power International, Inc. (“Huaneng International”) will release its 2026 interim results on the evening of 18 August 2026 and hold a global investor conference call the following day, 19 August 2026, from 16:00 to 17:30 (Beijing Time).

Senior management expected on the call include Director and President Liu Ancang, Chief Accountant and Board Secretary Wen Minggang, several independent non-executive directors, and other departmental heads. The session will cover the company’s operating performance and financial indicators for the first half of 2026, followed by a Q&A segment within the boundaries of regulatory disclosure requirements.

Investors wishing to participate must submit a reply slip to the company’s financial PR adviser, Wonderful Sky Financial Group, via hpi.invite@wsfg.hk by 9:00 a.m. Beijing Time on 17 August 2026 to receive dial-in details. Questions for management can be emailed to the same address by the same deadline.

Post-event, an audio replay of the call will be accessible on the company’s website (www.hpi.com.cn), enabling stakeholders to review management’s commentary and responses.

Enquiries can be directed to: • Ye Shuai, Wonderful Sky Mainland China: +86 131 6622 0381 • Zheng Hao, Wonderful Sky Hong Kong: +852 5958 2147 • Chen Zhelu, Huaneng International: +86 10 6322 6554

The announcement was authorised by Joint Company Secretary Wen Minggang and dated 12 August 2026.