[(a Sino-foreign joint stock limited company incorporated in the People’s Republic of China (Stock Code: 902) ISSUE OF SUPER SHORT-TERM DEBENTURES Listing Rules Company As resolved at the 2014 annual general meeting of Huaneng Power International, Inc. (the “ Debentures The Company has recently completed the issue of the second tranche of the Company’s super short-term debentures for 2016 (the] [(a Sino-foreign joint stock limited company incorporated in the People’s Republic of China (Stock Code: 902) ANNOUNCEMENT OF ANNUAL RESULTS FOR 2015 Power generation by domestic power plants: 320.529 billion kWh Consolidated operating revenue: RMB128.905 billion Net profit attributable to equity holders of the Company: RMB13.652 billion Earnings per share: RMB0.94 Proposed dividend: RMB0.47 per ordinary share (inclusive of tax)] [(a Sino-foreign joint stock limited company incorporated in the People’s Republic of China (Stock Code: 902) RESOLUTIONS PASSED AT THE FOURTEENTH MEETING OF THE EIGHTH SESSION OF THE BOARD OF DIRECTORS Listing Rules the Board Board of Directors Company Huaneng Power International Meeting On 22 March 2016, the Board of Directors (“ - 1 - 1. 2. 3. PROPOSAL ON] [(a Sino-foreign joint stock limited company incorporated in the People’s Republic of China (Stock Code: 902) CONNECTED TRANSACTION CAPITAL INCREASE IN HAINAN NUCLEAR - 1 - RELATIONSHIP BETWEEN THE COMPANY, HUANENG GROUP AND HUANENG NUCLEAR The Company and its subsidiaries mainly develop, construct, operate and manage large-scale power plants in China nationwide. It is one of the largest listed power] [(a Sino-foreign joint stock limited company incorporated in the People’s Republic of China (Stock Code: 902) ISSUE OF SUPER SHORT-TERM DEBENTURES Listing Rules Company As resolved at the 2014 annual general meeting of Huaneng Power International, Inc. (the “ Debentures The Company has recently completed the issue of the third tranche of the Company’s super short-term debentures for 2016 (the] [This Form 6-K consists of: 99.1 An announcement regarding issue of super short-term debentures as of March 14, 2016. 99.4 An announcement regarding connected transaction of capital increase in Hainan Nuclear. 99.5 An announcement regarding issue of super short-term debentures as of March 29, 2016. 2 HUANENG POWER INTERNATIONAL, INC. By]