Huaneng Power International : Current Report by Foreign Issuer (Form 6-K)

About this update from Huaneng Power International, Inc. Class A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of June 2022 Commission File Number 001-13314 Huaneng Power International, Inc. (Translation of registrant's name into English) Huaneng Power International, Inc. Huaneng Building, 6 Fuxingmennei Street, Xicheng District, Beijing, 100031 PRC (Address of principal executive office) Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F. Form 20-F x Form 40-F ¨ Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): ¨ Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): ¨ This Form 6-K consists of: A copy of monthly return of equity issuer on movements in securities of Huaneng Power International, Inc.(the "Registrant"), submitted by the Registrant on June 1, 2022. SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. HUANENG POWER INTERNATIONAL, INC. By: /s/ Huang Chaoquan Name: Huang Chaoquan Title: Company Secretary Date: June 6, 2022 Monthly Return for Equity Issuer and Hong Kong Depositary Receipts listed under Chapter 19B of the Exchange Listing Rules on Movements in Securities For the month ended: 31 May 2022 Status: New Submission To : Hong Kong Exchanges and Clearing Limited Name of Issuer: Huaneng Power International, Inc. Date Submitted: 01 June 2022 I. Movements in Authorised / Registered Share Capital 1. Type of shares Ordinary shares Class of shares Class H Listed on SEHK (Note 1) Yes Stock code 00902 Description H shares listed in Hong Kong and ADR listed in New York Number of authorised/registered shares Par value Authorised/registered share capital Balance at close of preceding month 4,700,383,440 RMB 1 RMB 4,700,383,440 Increase / decrease (-) RMB Balance at close of the month 4,700,383,440 RMB 1 RMB 4,700,383,440 2. Type of shares Ordinary shares Class of shares Class A Listed on SEHK (Note 1) No Stock code 600011 Description A Shares listed on The Shanghai Stock Exchange ("SSE") Number of authorised/reg...

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