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 June, 2004 (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: A press release on announcement of tariff adjustments, made on June 17, 2004, in English by Huaneng Power International Inc. 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/ Wang Xiaosong ------------------------------- Name: Wang Xiaosong Title: Vice Chairman Date: June 17, 2004 To: Business Editor [For Immediate Release] Huaneng Power International, Inc. Announces Tariff Adjustments (Beijing, the PRC, June 17, 2004) Huaneng Power International, Inc. (the "Company") [NYSE: HNP; HKEx: 902; SSE: 600011] announced tariff adjustments of some of its power plants. In accordance with documents issued by the National Development and Reform Commission, the on-grid tariffs (including VAT) of the Company's power plants are to be adjusted as follows: ------------------------------------------------------------------------------------------------------------------- Power Plant Approved Tariff Number of Utilisation Tariff Adjustment Effective Date Adjustment Hours Corresponding to for Excessive Approved Tariff Generation ------------------------------------------------------------------------------------------------------------------- Fuzhou Power Adjusted from RMB372/MWh Save for the agreed generation, June 15,2004 Plant to RMB372.5/MWh all generation to be charged in accordance with approved tariff ------------------------------------------------------------------------------------------------------------------- Shang'an Power Adjusted from RMB341/MWh Adjusted from 5,000 Adjusted from June 15, 2004 Plant to RMB324/MWh hours to 5,500 hours RMB194/MWh to RMB196/MWh ------------------------------------------------------------------------------------------------------------------- Shidongkou First Adjusted from Adjusted from 4,800 Adjusted from June 15, 2004 Power Plant RMB266.5/MWh to hours to 5,500 hours RMB224/MWh to RMB281/MWh RMB260/MWh ------------------------------------------------------------------------------------------------------------------- Shidongkou Adjusted from Adjusted from 4,900 Adjusted from June 15, 2004 Second Power RMB375.8/MWh to hours to 5,500 hours RMB224/MWh to Plant RMB374/MWh RMB260/MWh ------------------------------------------------------------------------------------------------------------------- Dezhou Power Generating units 1 to 4 5,500 hours Adjusted from June 15, 2004 Plant adjusted from RMB200/MWh to RMB352.5/MWh to RMB260/MWh RMB354/MWh; generating units 5 and 6 adjusted from RMB320/MWh to RMB321.5/MWh ------------------------------------------------------------------------------------------------------------------- Jining Power Plant Generating units 1 to 4 5,500 hours Adjusted from June 15, 2004 adjusted from RMB200/MWh to RMB280.76/MWh to RMB260/MWh RMB282.26/MWh; generating units 5 and 6 adjusted from RMB320/MWh to RMB321.5/MWh ------------------------------------------------------------------------------------------------------------------- Weihai Power Plant Adjusted from 5,500 hours Adjusted from June 15, 2004 RMB395.5/MWh to RMB200/MWh to RMB397/MWh RMB260/MWh ------------------------------------------------------------------------------------------------------------------- Xindian Power Adjusted from RMB 5,500 hours Adjusted from June 15, 2004 Plant 320/MWh to RMB321.5/MWh RMB200/MWh to RMB260/MWh ------------------------------------------------------------------------------------------------------------------- Shantou Adjusted from All generation to be charged in June 15, 2004 Coal-fired Power RMB443.41/MWh to accordance with approved tariff Plant RMB449.41/MWh ------------------------------------------------------------------------------------------------------------------- Nantong Power Adjusted from Adjusted from Adjusted from June 15, 2004 Plant RMB341/MWh to RMB338/MWh 4,864 hours to RMB240/MWh to 5,500 hours RMB280/MWh ------------------------------------------------------------------------------------------------------------------- Nanjing Power Adjusted from Adjusted from Adjusted from June 15, 2004 Plant RMB341/MWh to RMB338/MWh 4,864 hours to RMB240/MWh to 5,500 hours RMB280/MWh ------------------------------------------------------------------------------------------------------------------- Taicang Power Adjusted from Adjusted from Adjusted from June 15, 2004 Plant RMB372/MWh to RMB365/MWh 4,937 hours to RMB240/MWh to 5,500 hours RMB280/MWh ------------------------------------------------------------------------------------------------------------------- Huaiyin Power Adjusted from Adjusted from Adjusted from June 15, 2004 Plant RMB350/MWh to RMB344/MWh 4,749 hours to RMB240/MWh to 5,500 hours RMB280/MWh ------------------------------------------------------------------------------------------------------------------- Changxing Power Adjusted from Adjusted from Adjusted from June 15, 2004 Plant RMB339.16/MWh to 6,000 hours to RMB261/MWh to RMB371/MWh 5,500 hours RMB328/MWh ------------------- ------------------------- ------------------- ---------------------- -------------------------- Yushe Power Plant Generating units 1 and 5,500 hours Adjusted from June 15, 2004 2 remaining unchanged RMB164/MWh to (i.e. RMB308/MWh); RMB196/MWh Phase Two new generating units 3 and 4 to be fixed at RMB250/MWh ------------------------------------------------------------------------------------------------------------------- The adjustments of tariffs will result in an increase of overall average settled tariff, and will lead to certain increase of the annual income of the Company. The Company develops, constructs, operates and manages large thermal power plants in China nationwide, with a total generation capacity of 15,736MW on an equity basis. The Company wholly owns 14 power plants, and has controlling interests in five power plants and minority interests in three power companies. Today, the Company is one of the largest independent power producers in China. - End - For enquiries, please contact: Ms Meng Jing / Ms Zhao Lin Huaneng Power International, Inc. Tel: (8610) 6649 1856 / 1866 Fax: (8610) 6649 1860 Email: ir@hpi.com.cn Ms Christy Lai / Ms Edith Lui Rikes Communications Limited Tel: (852) 2520 2201 Fax: (852) 2520 2241