[_____________________ FORM 20-F (Mark One) £ OR R OR £ OR £ Date of event requiring this shell company report ………………. For the transaction period form ____________ to __________ 华能国际电力股份有限公司 HUANENG POWER INTERNATIONAL, INC. _____________________________ PEOPLE’S REPUBLIC OF CHINA _____________________________ (Jurisdiction of incorporation or organization) HUANENG BUILDING NO.4 FUXINGMENNEI STREET, XICHENG DISTRICT, BEIJING, PEOPLE’S REPUBLIC OF CHINA _____________________________ Mr. Gu] [Articles of Association of Huaneng Power International, Inc. Chapter 1 General Principles Article 1 Opinions on Standards for Joint Stock Limited Companies Company Law of the People’s Republic of China Securities Law of the People’s Republic of China Special Regulations on the Overseas Offering and Listing of Shares by Joint Stock Limited Companies promulgated by the State Council Mandatory Provisions] [List of Subsidiaries A list of Huaneng Power International Inc.’s subsidiaries is provided in Note 9 to the consolidated financial statements included in this annual report following Item 19.] [CERTIFICATIONS I, Cao Peixi, certify that: 1. I have reviewed this annual report on Form 20-F of Huaneng Power International, Inc.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements] [CERTIFICATIONS I, Zhou Hui, certify that: 1. I have reviewed this annual report on Form 20-F of Huaneng Power International, Inc.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements] [18 U.S.C. Section 1350, Section 906 of the Sarbanes-Oxley Act of 2002 (2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company. Cao Peixi April 19, 2012 Zhou Hui Chief Accountant (principal financial officer) April 19, 2012] [April 19, 2012 100 F Street, N.E. Commissioners: Very truly yours, PricewaterhouseCoopers Hong Kong April 19, 2012 PricewaterhouseCoopers, 22/F, Prince’s Building, Central, Hong Kong T: +852 2289 8888, F:+852 2810 9888, www.pwchk.com]