[FORM 20-F (Mark One) ¨ OR þ OR ¨ OR ¨ Date of event requiring this shell company report ………………. For the transaction period form ____________ to __________ HUANENG POWER INTERNATIONAL, INC. PEOPLE’S REPUBLIC OF CHINA (Jurisdiction of incorporation or organization) HUANENG BUILDING 6 FUXINGMENNEI STREET, XICHENG DISTRICT, BEIJING, PEOPLE’S REPUBLIC OF CHINA Mr. Du Daming HUANENG BUILDING, 6 FUXINGMENNEI] [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, Peixi Cao, 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, Hui Zhou, 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] [(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.]