Huaneng Power International, Inc. Announcement on Filing of Form 20-F

BEIJING,April 27,2021 -- Huaneng Power International,Inc. ("the Company") (NYSE: HNP; HKEx: 902; SSE: 600011) today announced that it filed its annual report on Form 20-F for the fiscal year ended December 31,2020 with the Securities and Exchange Commission on April 20,2021and has uploaded such annual report on Form 20-F to the Company's website at http://www.hpi.com.cnon April 26,2021. The Company will provide a hard copy of the annual report containing its audited consolidated financial statements,free of charge,to its shareholders and ADS holders upon request.

About Huaneng Power International,Inc.

Huaneng Power International,Inc. is one of China's largest listed power producers with controlled generation capacity of 113,805MW and equity-based generation capacity of 99,570 MW. The power plants of the Company are located in 26 provinces,autonomous regions and municipalities in China. The Company also has a wholly-owned power company in Singapore,and an invested power company in Pakistan.

For enquiries,please contact:

Huaneng Power International,Inc.

Ms. ZHU Tao / Ms. ZHAO Lin / Mr. CHEN Zhelu

Tel: (8610) 6608 6750 / 6322 6596 / 6322 6554

Fax:(8610) 63226888

Email: zqb@hpi.com.cn

Wonderful Sky Financial Group Limited

Ms. Peri Yang / Mr. Ken Yu

Tel: (852) 3641 1332

Fax: (852) 3102 0210

Email: hpi@wsfg.hk

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