Page 1

Hong Kong Exchanges and Clearing Limited and The Stock Exchange of Hong Kong Limited take no responsibility for the contents of this document , make no representation as to its accuracy or completeness and expressly disclaim any liability whatsoever for any loss howsoever arising from or in reliance upon the whole or any part of the contents of this document . 1 . 華能國際 電力 股份有限公司 HUANENG POWER INTERNATIONAL , INC . ( a Sino - foreign joint stock limited company incorporated in the People's Republic of China ) ( Stock Code : 902 ) THIRD QUARTERLY REPORT OF 2021 Pursuant to the regulations of the Shanghai Stock Exchange , the Company is required to publish a third quarter report . All financial information set out in this quarterly report is unaudited and prepared in accordance with the PRC Accounting Standards ( “ PRC GAAP " ) . This announcement is made by the Company pursuant to Rule 13.09 and Rules 13.10B of the Rules Governing the Listing of Securities on The Stock Exchange of Hong Kong Limited and the Inside Information Provisions under Part XIVA of the Securities and Futures Ordinance ( Chapter 571 , Laws of Hong Kong ) . IMPORTANT NOTICE 1.1 1.2 The board of directors and the supervisory committee of Huaneng Power International , Inc. ( the “ Company ” , “ Huaneng Power International " ) together with the members thereof and the senior management warrant that the information contained in this report does not contain any false statements , misleading representations or material omissions . All of them jointly and severally accept responsibility as to the truthfulness , accuracy and completeness of the content of this report . All financial information set out in this quarterly report is unaudited and prepared in accordance with the PRC GAAP . 1.3 Legal representative , person in charge of accounting function and person in charge of the Accounting Department warrant the truthfulness , accuracy and completeness of the content of the quarterly report . 1.4 This announcement is made by the Company pursuant to Rule 13.09 and Rules 13.10B of the Rules Governing the Listing of Securities on The Stock Exchange of Hong Kong Limited and the Inside Information Provisions under Part XIVA of the Securities and Futures Ordinance ( Chapter 571 , Laws of Hong Kong ) . - 1 -