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:

AAn ~~copy~~announcement of ~~monthly~~intention ~~return~~to ofdelist ~~equity~~American ~~issuer~~Depositary onShares ~~movements~~from inthe ~~securities~~New York Stock Exchange and intention to deregister and terminate reporting obligations under the U.S. Securities Exchange Act of Huaneng Power International, Inc.(the "Registrant"), ~~submitted~~made by the Registrant on June 17, 2022, and a press release with respect to the same issue made by the Registrant on June 1 17, 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
Date: June 21, 2022

~~Monthly~~Hong ~~Return~~Kong ~~for~~Exchanges ~~Equity~~and ~~Issuer~~Clearing Limited and The Stock Exchange of Hong Kong ~~Depositary~~Limited ~~Receipts listed~~take ~~under~~no ~~Chapter~~responsibility ~~19B~~for the contents of ~~the~~this ~~Exchange~~announcement, ~~Listing~~make ~~Rules on~~no ~~Movements~~representation as to its accuracy or completeness and expressly disclaim any liability whatsoever for any loss howsoever arising from or in ~~Securities~~reliance upon the whole or any part of the contents of this announcement.

~~For~~ANNOUNCEMENT ~~the~~OF ~~month~~INTENTION ~~ended:~~TO 31DELIST ~~May~~AMERICAN DEPOSITARY ~~2022~~SHARES ~~Status:~~FROM ~~New~~THE ~~Submission~~NEW YORK STOCK EXCHANGE AND INTENTION TO DEREGISTER AND TERMINATE REPORTING OBLIGATIONS

ToUNDER :THE ~~Hong~~U.S. ~~Kong~~SECURITIES ~~Exchanges~~EXCHANGE ~~and Clearing Limited~~ACT

Name of Issuer:	Huaneng Power International, Inc.
Date Submitted:	01 June 2022

Huaneng Power International, Inc. (“HPI”, or the “Company”) announced that the Company has notified the New York Stock Exchange (“NYSE”) on June 17, 2022 (Eastern Time in the U.S.) that it will apply for the voluntary delisting of its American depositary shares (“ADSs”) from the NYSE and the deregistration of such ADSs and underlying overseas listed shares, par value RMB1.00 per share (the “H Shares”), under the U.S. Securities Exchange Act of 1934, as amended (the “Exchange Act”). The board of directors of the Company approved the delisting of its ADSs from NYSE and the deregistration of such ADSs and the underlying H Shares under the Exchange Act due to a number of considerations, including the limited trading volume of its ADSs relative to the worldwide trading volume of its H Shares, and the considerable administrative burden and costs of maintaining the listing of the ADSs on the NYSE, the registration of the ADSs and the underlying H Shares with the United States Securities and Exchange Commission (the “SEC”) and complying with the periodic reporting and related obligations of the Exchange Act.

IAs such, the Company intends to file a Form 25 with the SEC on or about June 27, 2022 to de-list its ADSs from the NYSE. ~~Movements~~The indelisting ~~Authorised~~of /the ~~Registered~~ADSs ~~Share~~from ~~Capital~~the NYSE is expected to become effective ten days thereafter. The last day of trading of the ADSs on the NYSE will be on or about July 7, 2022. From and after that, the Company will no longer list its ADSs on the NYSE.

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

Once the delisting has become effective and the Company has met the criteria for deregistration, the Company intends to file a Form 15F with the SEC on or about July 7, 2022 to deregister the underlying H Shares under the Exchange Act. Thereafter, all of the Company’s reporting obligations under the Exchange Act will be suspended unless the Form 15F is subsequently withdrawn or denied. Deregistration with the SEC and termination of the Company’s reporting obligations under the Exchange Act are expected to become effective 90 days after its filing of Form 15F with the SEC. Once the Form 15F is filed, the Company will publish the information required under Rule 12g3-2(b) of the Exchange Act on its website, https://www.hpi.com.cn/sites/english/announcementH/publish.aspx. The

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/registered shares			Par value			Authorised/registered share capital
Balance at close of preceding month		10,997,709,919			RMB	1		RMB	10,997,709,919
Increase / decrease (-)								RMB
Balance at close of the month		10,997,709,919			RMB	1		RMB	10,997,709,919

- 1 -

~~Total~~Company ~~authorised/registered~~will ~~share~~also ~~capital~~continue atto comply with its financial reporting and other obligations as a listed-issuer under the ~~end~~Rules Governing the Listing of ~~the~~Securities ~~month:~~on ~~RMB~~The ~~15,698,093,359~~Stock Exchange of Hong Kong Limited (the “Listing Rules”).

~~Page~~The 1 Company intends to terminate its ADS program after delisting its ADSs from the NYSE and the deregistration of 6the underlying H Shares in due course in accordance with the deposit agreement.

~~II.~~The ~~Movements~~Company reserves its rights in ~~Issued~~all ~~Shares~~respects to delay or withdraw the aforementioned filings prior to their effectiveness and will issue any further announcement if required under the Listing Rules or other applicable laws.

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
Balance at close of preceding month		4,700,383,440
Increase / decrease (-)
Balance at close of the month		4,700,383,440

About Huaneng Power International, Inc.

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 SSE
Balance at close of preceding month		10,997,709,919
Increase / decrease (-)
Balance at close of the month		10,997,709,919

Huaneng Power International, Inc. is one of China’s largest listed power producers with controlled generation capacity of 121,118 MW and equity-based generation capacity of 108,588 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.

~~Page~~CAUTIONARY 2STATEMENT FOR PURPOSES OF THE “SAFE HARBOR” PROVISIONS OF THE PRIVATE SECURITIES LITIGATION REFORM ofACT 6OF 1995

~~III~~This announcement may contain, in addition to historical information, “forward-looking statements” within the meaning of the “safe harbor” provisions of the U.S. ~~Details~~Private Securities Litigation Reform Act of ~~Movements~~1995 inand ~~Issued~~Section 27A ~~Shares~~of the U.S. Securities Act of 1933 and Section 21E of the U.S. Securities Exchange Act of 1934. These forward-looking statements are based on the Company’s current assumptions, expectations and projections about future events. The Company uses words like “believe,” “anticipate,” “intend,” “estimate,” “expect,” “project” and similar expressions to identify forward looking statements, although not all forward-looking statements contain these words. These forward-looking statements are necessarily estimates reflecting judgment of the Company’s senior management and involve significant risks, both known and unknown, uncertainties and other factors that may cause the Company’s actual performance, financial condition or results of operations to be materially different from those suggested by the forward-looking statements. Except as required by law, the Company undertakes no obligation and does not intend to update any forward-looking statement, whether as a result of new information, future events or otherwise.

~~(A).~~By ~~Share~~order ~~Options~~of ~~(under~~the ~~Share~~Board ~~Option~~Huaneng ~~Schemes~~Power ofInternational, ~~the~~Inc. ~~Issuer)~~Huang ~~Not~~Chaoquan ~~applicable~~Company Secretary

~~(B).~~- ~~Warrants~~2 ~~to Issue Shares of the Issuer which are to be Listed Not applicable~~-

~~(C).~~As ~~Convertibles~~at ~~(i.e.~~the ~~Convertible~~date ~~into~~of ~~Issue~~this ~~Shares~~announcement, of the ~~Issuer~~directors ~~which~~of ~~are~~the toCompany ~~be Listed) Not applicable~~are:

Zhao Keyu (DExecutive Director). ~~Any~~Xu ~~other~~Mengzhou ~~Agreements~~(Independent orNon-executive ~~Arrangements~~Director) toZhao ~~Issue~~Ping ~~Shares~~(Executive ofDirector) ~~the~~Liu ~~Issuer~~Jizhen ~~which~~(Independent ~~are~~Non-executive toDirector) beHuang ~~listed,~~Jian ~~including~~(Non-executive ~~Options~~Director) Xu Haifeng (~~other~~Independent ~~than~~Non-executive ~~Share~~Director) ~~Options~~Wang ~~Schemes~~Kui (Non-executive Director) ~~Not~~Zhang ~~applicable~~Xianzhi (Independent Non-executive Director) Lu Fei (Non-executive Director) Xia Qing (Independent Non-executive Director) Teng Yu (Non-executive Director) Mi Dabin (Non-executive Director) Cheng Heng (Non-executive Director) Li Haifeng (Non-executive Director) Lin Chong (Non-executive Director)

~~(E).~~Beijing, ~~Other~~the ~~Movements in Issued Share Not applicable~~PRC

~~Page~~17 3June ~~of 6~~2022

~~IV.~~- ~~Information~~3 ~~about Hong Kong Depositary Receipt (HDR) Not applicable~~-

~~Page~~To: ~~4 of~~Business 6Editor June 17, 2022

V.(For immediate ~~Confirmations~~release)

~~We hereby~~HUANENG ~~confirm~~POWER ~~to the best knowledge~~INTERNATIONAL, information and belief that, in relation to each of the securities issued by the issuer during the month as set out in Part III and IV which has not been previously disclosed in a return published under Main Board Rule 13INC.~~25A / GEM Rule 17.27A, it has been duly authorised by the board of directors of the listed issuer and, insofar as applicable:~~

~~(Note~~Announcement 2)of Intention to Delist American Depositary Shares from the New York Stock Exchange And Intention to Deregister and Terminate Reporting Obligations under the U.S. Securities Exchange Act

(iBeijing, China, June 17, 2022) ~~all~~Huaneng ~~money~~Power International, Inc. (“HPI”, or the “Company”) (NYSE: HNP; HKEx: 902; SSE: 600011) today announced that the Company has notified the New York Stock Exchange (“NYSE”) on June 17, 2022 (Eastern Time in the U.S.) that it will apply for the voluntary delisting of its American depositary shares (“ADSs”) from the NYSE and the deregistration of such ADSs and underlying overseas listed shares, par value RMB1.00 per share (the “H Shares”), under the U.S. Securities Exchange Act of 1934, as amended (the “Exchange Act”). The board of directors of the Company approved the delisting of its ADSs from NYSE and the deregistration of such ADSs and the underlying H Shares under the Exchange Act due to a number of considerations, including the ~~listed~~limited ~~issuer~~trading involume of ~~respect~~its ADSs relative to the worldwide trading volume of its H Shares, and the ~~issue~~considerable administrative burden and costs of ~~securities~~maintaining the ~~has~~listing ~~been~~of ~~received~~the byADSs ~~it;~~on the NYSE, the registration of the ADSs and the underlying H Shares with the United States Securities and Exchange Commission (the “SEC”) and complying with the periodic reporting and related obligations of the Exchange Act.

~~(ii)~~As ~~all~~such, ~~pre-conditions~~the ~~for~~Company ~~listing~~intends ~~imposed~~to byfile a Form 25 with the ~~Rules~~SEC ~~Governing~~on or about June 27, 2022 to de-list its ADSs from the ~~Listing~~NYSE. The delisting of ~~Securities~~the onADSs from the NYSE is expected to become effective ten days thereafter. The ~~Stock~~last ~~Exchange~~day of ~~Hong~~trading ~~Kong~~of ~~Limited~~the ~~under~~ADSs ~~"Qualifications~~on ofthe ~~listing"~~NYSE ~~have~~will ~~been~~be ~~fulfilled;~~on or about July 7, 2022. From and after that, the Company will no longer list its ADSs on the NYSE.

~~(iii) all (if any) conditions contained in the formal letter granting listing of and permission to deal in the securities have been fulfilled;~~1

~~(iv)~~Once the delisting has become effective and the Company has met the criteria for deregistration, the Company intends to file a Form 1 5F with the SEC on or about July 7, 2022 to deregister the underlying H Shares under the Exchange Act. Thereafter, all of the Company’s ~~securities~~reporting obligations under the Exchange Act will be suspended unless the Form 15F is subsequently withdrawn or denied. Deregistration with the SEC and termination of ~~each~~the ~~class~~Company’s reporting obligations under the Exchange Act are inexpected ~~all~~to ~~respects~~become effective ~~identical~~90 days after its filing of Form 15F with the SEC. Once the Form 15F is filed, the Company will publish the information required under Rule 12g3-2(~~Note~~b) 3of the Exchange Act on its website, https://www.hpi.com.cn/sites/english/announcementH/publish.aspx. The Company will also continue to comply with its financial reporting and other obligations as a listed-issuer under the Rules Governing the Listing of Securities on The Stock Exchange of Hong Kong Limited (the “Listing Rules”);.

~~(v)~~The ~~all~~Company ~~documents~~intends ~~required~~to byterminate ~~the~~its ~~Companies~~ADS ~~(Winding~~program after Updelisting ~~and~~its ~~Miscellaneous~~ADSs ~~Provisions)~~from ~~Ordinance~~the toNYSE beand ~~filed with~~ the ~~Registrar~~deregistration of ~~Companies~~the ~~have~~underlying ~~been~~H ~~duly~~Shares ~~filed~~in ~~and~~due ~~that~~course ~~compliance~~in ~~has~~accordance ~~been made~~ with ~~other~~the ~~legal requirements;~~deposit agreement.

~~(vi)~~The ~~all~~Company ~~the~~reserves ~~definitive~~its ~~documents~~rights ofin ~~title~~all ~~have~~respects to ~~been~~delay ~~delivered/are~~or ~~ready~~withdraw tothe beaforementioned ~~delivered/are~~filings ~~being~~prior ~~prepared~~to their effectiveness and will beissue ~~delivered~~any infurther ~~accordance~~announcement ~~with~~if required under the ~~terms~~Listing ofRules ~~issue;~~or other applicable laws.

~~(vii)~~About ~~completion~~Huaneng ~~has~~Power ~~taken~~International, place of the purchase by the issuer of all property shown in the listing document to have been purchased or agreed to be purchased by it and the purchase consideration for all such property has been duly satisfied; andInc.

~~(viii)~~Huaneng ~~the~~Power ~~trust~~International, ~~deed/deed~~Inc. ~~poll~~is ~~relating~~one toof ~~the~~China's largest ~~debenture~~listed power producers with controlled generation capacity of 121,118 ~~loan~~MW ~~stock~~and equity-based generation capacity of 108,588 ~~notes~~MW. orThe power ~~bonds~~plants ~~has~~of ~~been~~the ~~completed~~Company ~~and~~are ~~executed~~located in 26 provinces, autonomous regions and ~~particulars~~municipalities ~~thereof,~~in ifChina. soThe ~~required~~Company byalso ~~law,~~has ~~have~~a ~~been~~wholly-owned power ~~filed~~company ~~with~~in ~~the~~Singapore, ~~Registrar~~and ofan ~~Companies~~invested power company in Pakistan.

~~Submitted by: Huang Chaoquan Title: Secretary to the Board of Directors (Director, Secretary or other Duly Authorised Officer)~~2

~~Notes~~CAUTIONARY STATEMENT FOR PURPOSES OF THE “SAFE HARBOR” PROVISIONS OF THE PRIVATE SECURITIES LITIGATION REFORM ACT OF 1995

1.This ~~SEHK~~press ~~refers~~release may contain, in addition to historical ~~Stock~~information, “forward-looking statements” within the meaning of the “safe harbor” provisions of the U.S. Private Securities Litigation Reform Act of 1995 and Section 27A of the U.S. Securities Act of 1933 and Section 21E of the U.S. Securities Exchange Act of ~~Hong~~1934. ~~Kong~~These forward-looking statements are based on the Company’s current assumptions, expectations and projections about future events. The Company uses words like “believe,” “anticipate,” “intend,” “estimate,” “expect,” “project” and similar expressions to identify forward looking statements, although not all forward-looking statements contain these words. These forward-looking statements are necessarily estimates reflecting judgment of the Company’s senior management and involve significant risks, both known and unknown, uncertainties and other factors that may cause the Company’s actual performance, financial condition or results of operations to be materially different from those suggested by the forward-looking statements. Except as required by law, the Company undertakes no obligation and does not intend to update any forward-looking statement, whether as a result of new information, future events or otherwise.

2.~ ~~Items~~End (i) to (viii) are suggested forms of confirmation which may be amended to meet individual cases. Where the issuer has already made the relevant confirmations in a return published under Main Board Rule 13.25A / GEM Rule 17.27A in relation to the securities issued, no further confirmation is required to be made in this return.~

~~Page~~For ~~5 of~~enquiries, please 6contact:

3Huaneng Power International, Inc. Mr. ~~“Identical”~~Chen ~~means~~Zhelu in/ ~~this~~Ms. ~~context~~Liu Tianyu Tel: (8610) 6322 6554 / 6322 6595 Fax: (8610) 6322 6888

•Email: ~~the securities are of the same nominal value with the same amount called up or paid up;~~zqb@hpi.com.cn

•Wonderful ~~they~~Sky ~~are~~Financial ~~entitled~~Group ~~to dividend/interest at the same rate and for the same period, so that at the next ensuing distribution, the dividend/interest payable per unit will amount to exactly the same sum (gross and net); and~~Limited

•Ms. ~~they~~Ketrina ~~carry~~Yang ~~the~~/ ~~same~~Ms. ~~rights~~Hester ~~as to unrestricted transfer, attendance and voting at meetings and rank pari passu in all other respects.~~Li

4.Tel: If(852) ~~there~~3970 ~~is insufficient space, please submit additional document.~~2239

5.Fax: In(852) ~~the~~3102 ~~context of repurchase of shares:~~0210

•Email: ~~“shares issuable to be listed on SEHK” should be construed as “shares repurchased listed on SEHK”; and~~hpi@wsfg.hk

~~• “stock code of shares issuable (if listed on SEHK)” should be construed as “stock code of shares repurchased (if listed on SEHK)”; and~~3

• “type of shares issuable” should be construed as “type of shares repurchased”; and

• “issue and allotment date” should be construed as “cancellation date”

6. In the context of redemption of shares:

• “shares issuable to be listed on SEHK” should be construed as “shares redeemed listed on SEHK”; and

• “stock code of shares issuable (if listed on SEHK)” should be construed as “stock code of shares redeemed (if listed on SEHK)”; and

• “type of shares issuable” should be construed as “type of shares redeemed”; and

• “issue and allotment date” should be construed as “redemption date”

Page 6 of 6

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