FORM 6-K


                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549


                       Report of Foreign Private Issuer
                     Pursuant to Rule 13a-16 or 15d-16 of
                      the Securities Exchange Act of 1934


                         For the month of April, 2005

   (Indicate by check mark whether the registrant files or will file annual
               reports under cover of Form 20-F or Form 40-F.)
                        Form 20-F  X      Form 40-F   
                                 -----             -----

       (Indicate by check mark whether the registrant by furnishing the
         information contained in this form is also thereby furnishing
         the information to the Commission pursuant to Rule 12g3-2(b)
                 under the Securities Exchange Act of 1934. )
                               Yes        No  X 
                                  -----     -----

  (If "Yes" is marked, indicate below the file number assigned to registrant
             in connection with Rule 12g3-2(b): 82-__________. )
                                      N/A

                       Huaneng Power International, Inc.
                    West Wing, Building C, Tianyin Mansion
                          No. 2C Fuxingmennan Street
                               Xicheng District
                              Beijing, 100031 PRC







This Form 6-K consists of:

         The announcement on the supplemental notice of 2004 annual general
meeting of Huaneng Power International, Inc.(the "Registrant"), made by the
Registrant in English on April 22, 2005.








                                   SIGNATURE





         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
under-signed, thereunto duly authorized.



                          HUANENG POWER INTERNATIONAL, INC.



                          By  /s/ Huang Long          
                              -----------------




                          Name:    Huang Long

                          Title:   Company Secretary



Date:     April 22, 2005







                               [GRAPHIC OMITTED]
                      HUANENG POWER INTERNATIONAL, INC.
   (A Sino-foreign joint stock limited company incorporated in the People's
                              Republic of China)
                               (Stock Code: 902)

              SUPPLEMENTAL Notice of 2004 Annual General Meeting

--------------------------------------------------------------------------------

Attention:

(1)   This supplemental notice is issued for the purposes of informing the
      shareholders of the Company that pursuant to the "Standard Opinions on
      Shareholders' Meetings of Listed Companies", Huaneng International Power
      Development Corporation, a shareholder of the Company, has requested to
      table the resolution number 9 below for shareholders' approval at the
      2004 Annual General Meeting. Such resolution will then be considered and
      examined by shareholders at the 2004 Annual General Meeting.

(2)   Revised proxy form ("Revised Proxy Form") is issued to the Company's
      shareholders accompanying with this supplemental notice. The proxy form
      previously issued by the Company accompanying with the Notice of 2004
      Annual General Meeting on 25th March 2005 (if duly completed) will still
      be valid unless the Company has received the Revised Proxy Form (if duly
      completed).
--------------------------------------------------------------------------------

NOTICE IS HEREBY GIVEN that the 2004 Annual General Meeting of Huaneng Power
International, Inc. (the "Company") will be held at 9:00 a.m. on Wednesday,
11th May, 2005 at Beijing International Convention Centre at No. 8 Beichen
East Road, Chaoyang District, Beijing, the People's Republic of China for the
conduct of approving the following resolutions:

Ordinary Resolutions:
1.    To consider and approve the working report from the Board of Directors
      of the Company for year 2004.

2.    To consider and approve the working report from the Supervisory
      Committee of the Company for year 2004.

3.    To consider and approve the audited financial statements of the Company
      for year 2004.

4.    To consider and approve the profit distribution plan of the Company for
      year 2004. (Note 1)

5.    To consider and approve the proposal regarding the appointment of
      PricewaterhouseCoopers Zhong Tian CPAs Co. Ltd as the PRC auditor of the
      Company and PricewaterhouseCoopers as the Company's international
      auditor for 2005 with a total remuneration of US$2.01 million.

6.    Proposal regarding the change of the session of Board of Directors:-
      (Note 2)

      6.1   appointment of Mr. Li Xiaopeng as the Company's director.

      6.2   appointment of Mr. Huang Yongda as the Company's director.

      6.3   appointment of Mr. Wang Xiaosong as the Company's director.

      6.4   appointment of Mr. Na Xizhi as the Company's director.

      6.5   appointment of Mr. Huang Long as the Company's director.

      6.6   appointment of Mr. Wu Dawei as the Company's director.

      6.7   appointment of Mr. Shan Qunying as the Company's director.

      6.8   appointment of Mr. Yang Shengming as the Company's director.

      6.9   appointment of Mr. Xu Zujian as the Company's director.

      6.10  appointment of Mr. Liu Shuyuan as the Company's director.

      6.11  appointment of Mr. Qian Zhongwei as the Company's independent 
            director.

      6.12  appointment of Mr. Xia Donglin as the Company's independent 
            director.

      6.13  appointment of Mr. Liu Jipeng as the Company's independent director.

      6.14  appointment of Mr. Wu Yusheng as the Company's independent director.

      6.15  appointment of Mr. Yu Ning as the Company's independent director.

7.    Proposal regarding the change of session of Supervisory Committee:-
      (Note 3)

      7.1   appointment of Mr. Ye Daji as the Company's supervisor.

      7.2   appointment of Mr. Shen Weibing as the Company's supervisor.

      7.3   appointment of Mr. Shen Zongmin as the Company's supervisor.

      7.4   appointment of Ms. Yu Ying as the Company's supervisor.

                              Special Resolution:

8.    To consider and approve the proposed amendments to the Articles of
      Association. (Note 4)

           Resolution Proposed by Shareholders - Special Resolution:

9.    To consider and approve that (i) an approval to be given to the Company
      to issue a short-term debenture of an principal amount up to RMB5
      billion within 12 months from the date on which shareholders' approval
      is obtained; (ii) an unconditional general mandate to be given to the
      Company's board of directors or any two or more directors to determine
      the terms and conditions and any relevant matters in relation to the
      issue of short-term debenture in accordance with the need of the Company
      and the market conditions, including the final principal amount of the
      short-term debenture to be issued within the prescribed scope as set out
      in (i) above, the execution of all necessary legal documents, and the
      conduct of appropriate information disclosures.


                                                     By Order of the Board
                                                          Huang Long
                                                       Company Secretary

Beijing, the PRC
22nd April, 2005



Notes:

1.    Having been audited by PricewaterhouseCoopers Zhong Tian CPAs Co. Ltd.
      and PricewaterhouseCoopers, the Company's net profit for the year ended
      31st December 2004 under the PRC GAAP, International Financial Reporting
      Standards and US GAAP were Rmb5,389,057,047, Rmb5,323,875,726 and
      Rmb5,740,320,198 respectively. 10% and 7.5% of the net profit for year
      2004 of the Company under the PRC GAAP (Rmb5,389,057,047) should be
      appropriated to the statutory surplus reserve fund and the statutory
      public welfare fund respectively, amounting to a total of
      Rmb943,084,984. No appropriation will be made to discretionary surplus
      reserve fund. According to the Articles of Association of the Company,
      dividends for distribution by the Company will be based on the lowest of
      the amounts determined in accordance with the aforesaid standards. The
      amount of the profit attributable to shareholders for 2004 was
      Rmb4,380,790,742.

      The Company's proposed dividend distribution plan for the year of 2004
      was a cash dividend of Rmb0.25 (tax inclusive) for every share of the
      Company. It was estimated that the total amount of cash to be paid as
      dividend was Rmb3,013,845,860.

2.    Biographies of candidates of Directors:-

      Li Xiaopeng Mr. Li, aged 46, graduated from the North China Institute of
      Electric Power specializing in power plants and power systems and is a
      senior engineer. He is Chairman and President of Huaneng International
      Power Development Corporation ("HIPDC"), as well as President of China
      Huaneng Group. Starting from June 1994, Mr. Li was Vice President,
      President and Vice Chairman of the Company as well as Vice President,
      President and Vice Chairman of HIPDC, Chairman of China Huaneng Group
      and Vice President of State Power Corporation. Before joining HIPDC, he
      had successively served as Engineer of the Power System Research
      Division, as Deputy Division Chief of the Planning and Operations
      Division, and as General Manager of the Power Technology and Economic
      Research Division, Electric Power Research Institute.

      Huang Yongda Mr. Huang, aged 48, graduated from China Renmin University,
      specializing in industrial financial accounting and is a senior
      accountant. He is the President of the Company and the Vice President of
      China Huaneng Group. He was the Deputy Director of the Economic
      Moderation and State Asset Supervision Office of Ministry of Power
      Industry, Deputy Director of the General Office of the Ministry of Power
      Industry, Deputy Officer of the Finance and Asset Management Department
      of State Power Corporation, Deputy Director of the Power Department of
      the State Economic and Trade Commission, President of Jiangxi Province
      Power Corporation and Vice President of HIPDC.

      Wang Xiaosong Mr. Wang, aged 59, graduated from Beijing Institute of
      Electric Power specializing in thermal power engineering and is a senior
      engineer. He is Vice President of HIPDC, and Vice President of China
      Huaneng Group. He was Vice President of the Company and Vice President
      of HIPDC. Before joining the Company, he had served as Deputy General
      Manager of Fushun Power Plant, General Manager of Yuanbaoshan Power
      Plant and Chief of the Labour and Wages Division of Northeast Power
      Administration.

      Na Xizhi Mr. Na, aged 52, graduated from Wuhan Hydro-electric
      University, specializing in thermal power with a master degree in
      engineering and is a senior engineer. He is Vice President of the
      Company and Deputy Chief Engineer of China Huaneng Group. He has served
      in China Huaneng Group as Deputy Manager of the Power Generation
      Department, General Manager of the Operation Department, General Manager
      of the Power Safety and Production Department.

      Huang Long Mr. Huang, aged 52, graduated with a M.S. degree from North
      Carolina State University in the U.S. specializing in communications and
      auto-control and is a senior engineer. He is Vice President of the
      Company as well as Secretary of the Board of Directors. After joining
      the Company, he served as Deputy General Manager and General Manager of
      the International Co-operation Department of the Company.

      Wu Dawei Mr. Wu, aged 52, has obtained a Master of Business
      Administration degree from the Central Europe International Business
      School and is a senior engineer. He is Deputy Chief Engineer of China
      Huaneng Group and President of China Huaneng Group East China Branch
      Company. He joined the Company in 1988 and has served as Deputy General
      Manager of Huaneng Shanghai Shidongkou Second Power Plant, Deputy
      Manager of Shanghai branch of the Company, and the General Manager of
      Huaneng Shanghai Shidongkou Second Power Plant.

      Shan Qunying Mr. Shan, aged 52, graduated from Beijing Steel Institute
      specializing in automation and is a senior engineer. He is the Vice
      President of Hebei Provincial Construction Investment Company. He had
      been the Division Chief of Hebei Provincial Construction Investment
      Company.

      Yang Shengming Mr. Yang, aged 62, graduated from Beijing Light
      Industries Institute and is a senior economist. He is the Vice President
      of Fujian International Trust and Investment Company Limited, Executive
      Director of Hong Kong Minxin Group Limited Company, Director of
      Yongcheng Property Insurance Joint Stock Company and Executive Director
      of Xiamen International Bank.

      Xu Zujian Mr. Xu, aged 51, graduated from Liaoning Finance Institute
      majoring in infrastructure finance and is a senior economist. He is
      Director and Vice President of Jiangsu Province Guoxin Asset Management
      Group Limited Company, and Chairman of Jiangsu Investment Management Co.
      Ltd. He was Vice President of Jiangsu International Trust and Investment
      Company Limited, President of Jiangsu Province Investment Management Co.
      Ltd..

      Liu Shuyuan Mr. Liu, aged 55, is a senior economist and a postgraduate
      specializing in economic management. He is the Director and is President
      of Liaoning Energy Investment (Group) Limited Liability Company. He has
      been the Vice President of Liaoning Provincial Trust and Investment
      Corporation, of Liaoning Chuangye (Group) Limited Liability Company
      (Liaoning Energy Corporation) and Director and President of Liaoning
      Chuangye (Group) Limited Liability Company (Liaoning Energy
      Corporation).

      Qian Zhongwei Mr. Qian, aged 67, graduated from the electrical
      engineering department of Qinghua University and is a senior engineer.
      He has been the Deputy Chief Engineer, Chief Engineer and Deputy
      Director of the Eastern China Power Industry Management Bureau, Director
      of Shanghai Electricity Bureau, Director of Eastern China Power
      Administration Bureau, and President of Eastern China Power Group
      Company.

      Xia Donglin Mr. Xia, aged 44, graduated from the Finance and
      Administration Science Research Institute of Ministry of Finance,
      specialising in accounting and was awarded a Ph.D. degree of Economics.
      He is a certified public accountant (non practising member). He is a
      professor and Ph.D. tutor of the Economic and Management School of
      Qinghua University. He is also the Advisory Specialist of the Accounting
      Standard Committee of the PRC Ministry of Finance, General Secretary of
      China Accounting Society, and Independent Director of Zhejiang Zhongda
      companies and other companies. He was the head of Accounting Department
      of Economic and Management School of Qinghua University.

      Liu Jipeng Mr. Liu, aged 49, graduated from the Industrial Economic
      Department of the Graduate School of China Academy of Social Science
      with a master's degree in economics. He is titled as professor and is a
      certified public accountant. He is the chairman of Beijing Standard
      Consulting Company, professor of Capital Economic and Trade University.
      He is also a professor of the Graduate School of China Academy of Social
      Science, mentor of graduate students of the Centre for Financial Studies
      of the Ministry of Finance, senior consultant of China Power Enterprises
      Union, China Securities Market Research and Design Centre and consultant
      of State Power Corporation.

      Wu Yusheng Mr. Wu, aged 49, graduated from Postgraduate School of China
      Electric Power Research Institute specializing in electric power system
      and auto-control with a master degree. Mr. Wu is a senior engineer. He
      is Deputy Chief Engineer of State Power Grid Corporation and President
      of China Electric Power Research Institute. Mr. Wu served as Deputy
      Director and senior engineer of Power Grid Department of China Electric
      Power Research Institute and Deputy Chief Engineer and Deputy Director
      of China Electric Power Research Institute.

      Yu Ning Mr. Yu, aged 51, graduated from Peking University specializing
      in economic law with a master degree. He is the Deputy President of All
      China Lawyers Association, part-time Professor at Peking University,
      mentor of master postgraduates at Qinghua University Law School,
      practicing lawyer at Beijing Times Law Firm (currently under the name
      "Beijing Times Huadi Law Firm"). Mr. Yu served as Deputy Director and
      Director of CCP Central Disciplinary Inspection Commission.

3.    Biographies of candidates of Supervisors:-

      Ye Daji Mr. Ye, aged 60, graduated from Department of Mechanical
      Engineering Shanghai Jiao Tong University and is a senior engineer. He
      is Chief Engineer of China Huaneng Group. After joining in the Company,
      Mr. Ye served as Deputy Manager of Shanghai branch company of Huaneng
      International Inc., President of Huaneng Shanghai Shidongkou Second
      Power Plant. Since December 1995, Mr. Ye served as Vice President and
      President of the Company, Vice President of HIPDC and Director of China
      Huaneng Group. Before joining the Company, Mr. Ye served as Deputy Chief
      Engineer of Shanghai Shidongkou Power Plant.

      Shen Weibing Mr. Shen, aged 38, graduated from Material Management
      Department of Beijing Material Institute with a bachelar of science
      degree. He is a senior economist. In 2003, he studied at Nanjing
      University and received a master degree in business administration. He
      is Deputy Chief Officer of Nantong Investment Management Center. He
      served as Vice President and President of Nantong Municipal Oil Company,
      Vice President and Legal Representative of Nantong Municipal
      Construction Investment Company, and Deputy Chief Officer and Chief
      Officer of Nantong Investment Management Center.

      Shen Zongmin Mr. Shen, aged 51, has a MBA degree. He is Manager of
      Shantou Electric Power Development Corporation. He was President of
      Shantou Light Industry Mechanical Group, Deputy Manager, and Manager of
      Shantou Power Development Corporation and Chairman of Shantou Power
      Development Joint Stock Company.

      Yu Ying Ms. Yu, aged 50, graduated from Liaoning University of Finance
      and Economics, specializing in finance and credit, with a master degree
      in Economics. Ms. Yu is a senior economist. She is President of Dalian
      Municipal Investment Corporation. Ms. Yu served as Director of Social
      Affair Department of Dalian Municipal Planning Commission and Director
      of Fixed Assets Investment Department of Dalian Municipal Development
      and Planning Commission.

4.    Amendments to the Articles of Association

      1. That the last paragraph of the existing Article 15 of the Articles of
         Association:

            "Following issuance of new overseas listed foreign shares,
            distribution of dividends and issuance of new shares by conversion
            of the additional paid-in capital and the surplus reserve fund as
            stipulated in Article 16, share capital structure of the Company
            has changed to: 12,055,383,440 common shares including 500,000,000
            listed domestic shares representing 4.15% of the total share
            capital of the Company, 8,500,000,000 other domestic shares
            representing 70.51% of the total share capital of the Company and
            3,055,383,440 overseas listed foreign shares representing 25.34%
            of the total share capital of the Company;"

            be amended as follows:

            "The current share capital structure of the Company is:
             12,055,383,440 common shares, including:

            (1)   5,197,680,000 shares held by Huaneng International Power
                  Development Corporation, representing 43.12% of the total
                  share capital;

            (2)   904,500,000 shares held by Heibei Provincial Construction
                  Investment Company, representing 7.50% of the total share
                  capital;

            (3)   624,750,000 shares held by Jiangsu Province International
                  Trust & Investment Company, representing 5.18% of the total
                  share capital;

            (4)   561,700,000 shares held by Fujian International Trust &
                  Investment Company, representing 4.66% of the total share
                  capital;

            (5)   459,370,000 shares held by Liaoning Energy Investment
                  (Group) Limited Liability Company, representing 3.81% of the
                  total share capital;

            (6)   452,250,000 shares held by Dalian Municipal Construction
                  Investment Company, representing 3.75% of the total share
                  capital;

            (7)   135,750,000 shares held by Nantong Investment Management
                  Centre, representing 1.13% of the total share capital;

            (8)   108,000,000 shares held by Minxin Group, representing 0.90%
                  of the total share capital;

            (9)   38,000,000 shares held by Shantou Power Development Joint
                  Stock Company Limited, representing 0.32% of the total share
                  capital;

            (10)  13,000,000 shares held by Dandong Energy Investment
                  Development Centre, representing 0.11% of the total share
                  capital;

            (11)  5,000,000 shares held by Shantou Electric Power Development
                  Company, representing 0.04% of the total share capital;

            (12)  500,000,000 listed domestic shares representing 4.15% of the
                  total share capital;

            (13)  3,055,383,440 overseas listed foreign shares representing
                  25.34% of the total share capital.

            Should there be any discrepancy between the share capital
            structure as stipulated above and the record in shareholders
            registry as specified in Section 6 of the Articles of Association,
            the shareholders registry shall prevail."

      2.    That Article 101 of the existing Articles of Association:

            "The board of supervisors constitutes of 5 shareholder
            representatives and 1 employee representative. Shareholder
            representatives shall be elected and removed by general meeting
            and employee representative shall be elected and removed by
            employees of the Company;"

            be amended as follows:

            "The board of supervisors constitutes of 4 shareholder
            representatives and 2 employee representatives. Shareholder
            representatives shall be elected and removed by general meeting
            and employee representatives shall be elected and removed by
            employees of the Company."

5.    Eligibility for attending the Annual General Meeting

      Holders of the Company's H Shares whose names appear on the HK$ Dividend
      H Shares Register and/or the US$ Dividend H Shares Register maintained
      by Hong Kong Registrars Limited and holders of the Company's Domestic
      Shares whose names appear on the Domestic Shares Register maintained by
      the Company at the close of business on 11th April, 2005 are eligible to
      attend the Annual General Meeting and are entitled to receive cash
      dividends.

6.    Proxy

      (i)   A member eligible to attend and vote at the Annual General Meeting
            is entitled to appoint, in written form, one or more proxies to
            attend and vote on his behalf. A proxy needs not be a shareholder.

      (ii)  A proxy should be appointed by a written instrument signed by the
            appointor or its attorney duly authorised in writing. If the form
            of proxy is signed by the attorney of the appointor, the power of
            attorney authorising that attorney to sign or other authorisation
            document(s) shall be notarised.

      (iii) To be valid, the power of attorney or other authorisation
            document(s) which have been notarised together with the completed
            form of proxy must be delivered, in the case of holders of
            Domestic Shares, to the Company and, in the case of holders of H
            Shares, to Hong Kong Registrar Limited, not less than 24 hours
            before the time designated for holding of the Annual General
            Meeting.

      (iv)  A proxy may exercise the right to vote by a show of hands or by
            poll. However, if more than one proxy is appointed by a
            shareholder, such proxies shall only exercise the right to vote by
            poll.

7.    Registration procedures for attending the Annual General Meeting

      (i)   A shareholder or his proxy shall produce proof of identity when
            attending the meeting. If a shareholder is a legal person, its
            legal representative or other persons authorised by the board of
            directors or other governing body of such shareholder may attend
            the Annual General Meeting by producing a copy of the resolution
            of the board of directors or other governing body of such
            shareholder appointing such persons to attend the meeting.

      (ii)  Holders of H Shares intending to attend the Annual General Meeting
            should return the reply slip for attending the Annual General
            Meeting to the Company on or before 20th April, 2005.

      (iii) Shareholders may send the reply slip to the Company in person, by
            post or by fax.

8.    Closure of H Share Register of MembersThe H share register of members of
      the Company will be closed from 11th April, 2005 to 10th May, 2005 (both
      days inclusive).

      Due to Hong Kong public holidays the last trading day before the closure
      of H Share Register is 8th April, 2005.

9.    Other Businesses

      (i)   The Annual General Meeting will last for half day. Shareholders
            who attend shall bear their own travelling and accommodation
            expenses.

      (ii)  The address of the Share Registrar for H Shares of the Company,
            Hong Kong Registrar Limited, is at:

            46/F., Hopewell Centre
            183 Queen's Road East
            Hong Kong

      (iii) The registered address of the Company is at:

            West Wing,
            Building C,
            Tianyin Mansion,
            2C Fuxingmennan Street,
            Xicheng District,
            Beijing 100031,
            The People's Republic of China

            Telephone No.: (+86)-10-66491999

            Facsimile No.: (+86)-10-66491888


As at the date hereof this announcement, the Board comprises:



                                                      
Li Xiaopeng (Non-executive director)                     Gao Zongze (Independent non-executive director)
Wang Xiaosong (Non-executive director)                   Zheng Jianchao (Independent non-executive director)
Huang Yongda (Executive director)                        Qian Zhongwei (Independent non-executive director)
Ye Daji (Non-executive director)                         Xia Donglin (Independent non-executive director)
Huang Jinkai (Non-executive director)                    Liu Jipeng (Independent non-executive director)
Liu Jinlong (Non-executive director)
Shan Qunying (Non-executive director)
Yang Shengming (Non-executive director)
Xu Zujian (Non-executive director)
Liu Shuyuan (Non-executive director)