BEIJING, May 10, 2012 /PRNewswire-Asia/ -- Huaneng Power International, Inc. ("HPI", the "Company") (NYSE: HNP; HKEx:902; SSE:600011) today announced that one 20MW generating unit (Unit 2) of Hunan Yongzhou Xiangqi Hydropower Station (which is wholly-owned by the Company) has completed trial run recently. To date, the Company's total controlled generation capacity has increased from 60,375MW to 60,395MW, and total equity-based generation capacity has increased from 55,350MW to 55,370MW. About the Company The Company is one of China's largest listed power producers with controlled generation capacity of 60,395 MW and equity-based generation capacity of 55,370 MW. The power plants of the Company are located in 19 provinces, municipalities and autonomous regions in China. The Company also has a wholly-owned power company in Singapore. For enquiries, please contact: Huaneng Power International, Inc.Ms. MENG Jing / Ms. ZHAO LinTel: +86-10-6608-6765 / +86-10-6322-6596Fax: +86-10-6641-2321Email: email@example.com Wonderful Sky Financial Group LimitedMr. Hon Fung / Ms. Yolanda Wang / Mr. Tony Chen / Ms. Sharon LauTel: +852-2851-1038Fax: +852-2865-1638Email: firstname.lastname@example.org / email@example.com / firstname.lastname@example.org / email@example.com SOURCE Huaneng Power International, Inc.