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, 2006 (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: The announcement on tariff adjustments of Huaneng Power International Inc. (the "Registrant"), made by the Registrant in English on June 29, 2006. 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/ Huang Long -------------- Name: Huang Long Title: Executive Director Date: June 29, 2006 [GRAPHIC OMITTED] (a Sino-foreign joint stock limited company incorporated in the People's Republic of China) (Stock Code: 902) OVERSEAS REGULATORY ANNOUNCEMENT ADJUSTMENTS OF TARIFFS This announcement is made pursuant to Rule 13.09(2) of the Rules Governing the Listing of Securities on the Stock Exchange of Hong Kong Limited. Huaneng Power International, Inc. (the "Company") announced the adjustments of tariffs of some of its power plants. Pursuant to a notice recently issued by the National Development and Reform Commission (the "NDRC"), the NDRC decided to adjust the on-grid tariffs of the power plants in the power grids of North China, South China, Central China, East China, Northeast and Northwest with effect from 30th June 2006. The main purpose of adjusting the on-grid tariffs is to resolve the conflict arising from the increase of coal price and the desulphurization renovation of power plants. Key aspects of the plan include the following: 1. Coal-electricity Price Linkage Mechanism (the "Mechanisms") to be implemented to appropriately raise on-grid tariffs In order to resolve the problem due to the increase of the average coal price in 2005 exceeding the latest estimates as per Mechanisms in the regions where the Company's power plants are located, the increase of the contract price of coal in 2006, and the impact on on-grid tariffs resulted from the two increases in the railway transportation costs in 2005, the on-grid tariffs are to be appropriately raised. 2. On-grid tariffs will be increased as a result of the cost increase due to the installation of the flue-gas desulphurization facilities In respect of the coal-fired generating units with desulphurization facilities which had been put into operation before the end of 2006 while their on-grid tariffs have not been taken into consideration of the cost of desulphurization, their on-grid tariffs will be increased by RMB15/MWh (including VAT) after passing the examination by the provincial environmental protection departments and obtaining the approval from the provincial pricing bureau. 3. Excess generation tariffs will be abolished for those provinces where excess generation tariffs have been previously applied Such abolition will be implemented in the South Hebei Grid, Hunan Province and Gansu Province where the Company's power plants are located. According to the above-mentioned approved tariff adjustment plan, the average on-grid tariffs (including VAT) of the Company's coal-fired power plant will be increased by RMB9/MWh (exclusive of tariff increase for desulphurization) with effect from 30th June 2006. Pursuant to a document in respect of the tariff adjustments issued by the NDRC, the on-grid tariffs of the Company's power plants will be adjusted as follow: ----------------------------------------------------------------------------------------------------------------------- On-grid Tariff before On-grid Tariff Adjustment Change after Adjustment Remark Power Plants (RMB/MWh) (RMB/MWh) (RMB/MWh) (VAT Inclusive) (VAT Inclusive) (VAT Inclusive) ----------------------------------------------------------------------------------------------------------------------- Liaoning Province ----------------------------------------------------------------------------------------------------------------------- Dalian - Increase RMB15.1/MWh - Dandong - as a result of the - Yingkou - Mechanisms - ----------------------------------------------------------------------------------------------------------------------- Guangdong Povince ----------------------------------------------------------------------------------------------------------------------- Shantou Coal-fired 468.51 29.20 497.71 Inclusive of tariff Phase I increase of RMB15 for desulphurization ----------------------------------------------------------------------------------------------------------------------- Shantou Coal-fired 439.00 14.20 453.20 - Phase II ----------------------------------------------------------------------------------------------------------------------- Jiangsu Province ----------------------------------------------------------------------------------------------------------------------- Nantong 355.70 15.50 371.20 Inclusive of tariff increase of RMB7.5 for desulphurization (700MW desulphurized), to be implemented ----------------------------------------------------------------------------------------------------------------------- Nanjing 355.70 8.000 363.70 - ----------------------------------------------------------------------------------------------------------------------- Taicang 384.20 6.500 390.70 Inclusive of tariff increase of RMB2.5 for desulphurization (300MW desulphurized), to be implemented ----------------------------------------------------------------------------------------------------------------------- Huaiyin Phase I 359.70 19.00 378.70 Inclusive of tariff increase of RMB15 for desulphurization, to be implemented ----------------------------------------------------------------------------------------------------------------------- Huaiyin Phase II 385.70 4.00 389.70 - ----------------------------------------------------------------------------------------------------------------------- Shandong Province ----------------------------------------------------------------------------------------------------------------------- Dezhou Phase II 355.50 25.90 381.40 Inclusive of tariff increase of RMB15 for desulphurization, to be implemented ----------------------------------------------------------------------------------------------------------------------- Dezhou Phase I and III 355.50 10.90 366.40 - ----------------------------------------------------------------------------------------------------------------------- Jining Unit 3 and 4 310.00 20.90 330.90 - ----------------------------------------------------------------------------------------------------------------------- Jining Unit 5 and 6 360.00 10.90 370.90 - ----------------------------------------------------------------------------------------------------------------------- Weihai 400.00 6.00 406.00 - ----------------------------------------------------------------------------------------------------------------------- Xindian 345.00 10.90 355.90 - ----------------------------------------------------------------------------------------------------------------------- Rizhao 396.40 10.90 407.30 - ----------------------------------------------------------------------------------------------------------------------- Shanghai ----------------------------------------------------------------------------------------------------------------------- Shidongkou I 358.00 13.70 371.70 Inclusive of tariff increase of RMB15 Shidongkou II 358.00 13.70 371.70 for desulphurization for Shidongkou I. In order to keep the tariff level of the two plants consistent, the tariffs of both power plants will be increased by RMB7.5, to be implemented ----------------------------------------------------------------------------------------------------------------------- Hebei South Grid ----------------------------------------------------------------------------------------------------------------------- Shangan 341.00 9.50 350.50 - ----------------------------------------------------------------------------------------------------------------------- Zhejiang Province ----------------------------------------------------------------------------------------------------------------------- Changxing 403.80 9.50 413.30 - ----------------------------------------------------------------------------------------------------------------------- Shanxi Province ----------------------------------------------------------------------------------------------------------------------- Yushe Phase I 308.00 16.40 324.40 - ----------------------------------------------------------------------------------------------------------------------- Yushe Phase II 259.00 16.40 275.40 - ----------------------------------------------------------------------------------------------------------------------- Henan Province ----------------------------------------------------------------------------------------------------------------------- Qinbei 321.00 13.20 334.20 - ----------------------------------------------------------------------------------------------------------------------- Chongqing Municipal ----------------------------------------------------------------------------------------------------------------------- Luohuang 308.00 14.40 322.40 - ----------------------------------------------------------------------------------------------------------------------- Hunan Province ----------------------------------------------------------------------------------------------------------------------- Yueyang Phase I 369.00 18.50 387.50 - ----------------------------------------------------------------------------------------------------------------------- Yueyang Phase II 384.00 18.50 402.50 - ----------------------------------------------------------------------------------------------------------------------- Jiangxi Province ----------------------------------------------------------------------------------------------------------------------- Jinggangshan 365.00 13.00 378.00 - ----------------------------------------------------------------------------------------------------------------------- Gansu Province ----------------------------------------------------------------------------------------------------------------------- Pingliang 230.30 8.80 239.10 - ----------------------------------------------------------------------------------------------------------------------- By Order of the Board Huang Long Vice Chairman As at the date of this announcement, the directors of the Company are: Li Xiaopeng Qian Zhongwei (Executive Director) (Independent non-executive director) Huang Yongda Xia Donglin (Non-Executive Director) (Independent non-executive director) Na Xizhi Liu Jipeng (Executive Director) (Independent non-executive director) Huang Long Wu Yusheng (Executive Director) (Independent non-executive director) Wu Dawei Yu Ning (Non-executive Director) (Independent non-executive director) Shan Qunying (Non-executive Director) Ding Shida (Non-executive Director) Xu Zujian (Non-executive Director) Liu Shuyuan (Non-executive Director) Beijing, the PRC 29th June, 2006