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Huaneng Power International

(a Sino-foreign joint stock limited company incorporated in the People’s Republic of China)

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”) announces that a 600MW supercritical air-cooling desulphurization coal-fired generating unit (Unit 5) of the Phase III Project at Huaneng Shangan Power Plant, which is wholly owned by the Company, has obtained approvals from the relevant authorities recently and commenced commercial operation on 1 July 2008. To date, the Company’s total generation capacity on an equity basis has increased from 36,393MW to 36,993MW. Unit 5 of Shangan Power Plant is the first 600MW supercritical air-cooling unit which commenced operation in the PRC. The project represents the integration of high-efficiency and low-consumption supercritical power generating technology with water-saving direct air-cooling technology for the first time in the PRC. The environmental protection benefits in terms of energy saving and water saving are significant.

By Order of the Board

As at the date of this announcement, the directors of the Company are:

Huang Yongda

(Non-executive Director)

Huang Long

(Non-executive Director)

Wu Dawei

(Non-executive Director)

Liu Guoyue

(Executive Director)

Fan Xiaxia

(Executive Director)

Shan Qunying

(Non-executive Director)

Xu Zujian

(Non-executive Director)

Huang Mingyuan

(Non-executive Director)

Liu Shuyuan

(Non-executive Director)

Liu Jipeng

(Independent Non-executive Director)

Yu Ning

(Independent Non-executive Director)

Shao Shiwei

(Independent Non-executive Director)

Zheng Jianchao

(Independent Non-executive Director)

Wu Liansheng

(Independent Non-executive Director)

Beijing, the PRC

13 August 2008