Huaneng Power International, Inc. (“Huaneng International”) plans to disclose its 2025 third quarter results on the evening of October 28, 2025. To provide global investors with a comprehensive understanding of its operating results and financial position for the first three quarters of 2025, Huaneng International will hold a conference call on October 29, 2025 (Wednesday), from 16:00 to 17:30 Beijing Time.

The conference call will feature Chairman Wang Kui, Independent Director Zhang Liying, Vice President/General Counsel/Chief Compliance Officer Qin Haifeng, Vice President and Secretary to the Board Huang Chaoquan, and the heads of relevant departments and offices. Investors interested in attending are requested to email the completed reply slip to hpi.invite@wsfg.hk by 9 a.m. on October 27, 2025 (Monday) to receive dial-in details. Questions of interest may be submitted in advance to the same email address by the same deadline.

After the call, audio materials will be made available on the company’s website (www.hpi.com.cn) for investors to access. The announcement was dated October 22, 2025, in Beijing.