Announcement on Adjustments on On-Grid Tariffs

Hong Kong Exchanges and Clearing Limited and The Stock Exchange of Hong KongLimited take no responsibility for the contents of this announcement, make norepresentation as to its accuracy or completeness and expressly disclaim anyliability whatsoever for any loss howsoever arising from or in reliance uponthe whole or any part of the contents of this announcement. DATANG INTERNATIONAL POWER GENERATION CO., LTD. (a sino-foreign joint stock limited company incorporated in the People's Republic of China) (Stock Code: 00991) OVERSEAS REGULATORY ANNOUNCEMENT AND INSIDE INFORMATION ANNOUNCEMENT ANNOUNCEMENT ON ADJUSTMENTS ON ON-GRID TARIFFS This announcement is made by Datang International Power Generation Co., Ltd(the "Company") pursuant to Part XIVA of the Securities and Futures Ordinance(Cap 571 of the Laws of Hong Kong) and Rules 13.09(2)(a) and 13.10B of theRules Governing the Listing of Securities on The Stock Exchange of Hong KongLimited. The Company announces that it recently received the "NDRC's Notice on Reducingthe On-Grid Tariffs for Coal-fired Power and Electricity Prices for Industrialand Commercial Use" (NDRC Prices [2015] No. 748 (the "Notice") issued byNational Development and Reform Commission ("NDRC"). Based on the relevantprinciples of the power system reform and the relevant requirements of thelinkage system for coal and electricity prices, the Notice was issued to makedownward adjustments on the on-grid tariffs for coal-fired power. According to the Notice, the details of downward adjustments on the on-gridtariffs of the Company's coal-fired power generating units in the major serviceregions are as follows: Regional/Cross-regional power transmission Downward adjustmentamount (RMB/kWh (tax-inclusive)) Tianjin 0.0234 Hebei Province (Northern Grid) 0.0170 Shanxi Province 0.0234 Shanxi Province Transmitted to Northern China 0.01778(Plant to grid) Western Area of Inner Mongolia Autonomous 0.0067Region Western Area of Inner Mongolia Autonomous 0.01778Region Transmitted to Northern China (Plant togrid) Liaoning Province 0.0181 Zhejiang Province 0.0127 Jiangsu Province 0.0214 Gansu Province 0.0039 Ningxia Hui Autonomous Region 0.0080 Fujian Province 0.0304 Jiangxi Province 0.0159 Guangdong Province 0.0285 Yunnan Province 0.0163 Chongqing 0.0170 The abovementioned tariff adjustments came into effect on 20 April 2015. Afterthe current on-grid tariff adjustments for coal-fired power, the averageon-grid tariffs for the Company's coal-fired power generating units will bedecreased by approximately RMB1.89 cents/kWh (tax-inclusive). By Order of the Board Zhou Gang Secretary to the Board Beijing, the PRC, 27 April 2015 As at the date of this announcement, the Directors of the Company are: Chen Jinhang, Hu Shengmu, Wu Jing, Liang Yongpan, Zhou Gang, Cao Xin,Cai Shuwen, Liu Haixia, Guan Tiangang, Yang Wenchun,Dong Heyi*, Ye Yansheng*, Zhao Jie*, Jiang Guohua*, Feng Genfu* * Independent non-executive Directors