Netjoy Holdings Limited — AGM Information 2012

Jan 5, 2012

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Reply Slip for 2012 First Extraordinary General Meeting

I/(We)of
Telephone number: and Fax number:,
being the holder(s) ofH Share(s)/Domestic Share(s)* of Huaneng Power
International, Inc. (the “Company”) hereby reply that I/(We) wish to attend or appoint a proxy to attend (on my/our behalf) the 2012
First Extraordinary General Meeting (the “EGM”) to be held at 9 a.m. on 21 February 2012 at the headquarters of the Company at
Huaneng Building, 4 Fuxingmennei Street, Xicheng District, Beijing, the People’s Republic of China.

Signature: Date:

Note: Eligible shareholders who wish to attend the EGM are advised to complete and return this reply slip to the Company’s business address at Capital Market Department, Huaneng Power International, Inc., Huaneng Building, 4 Fuxingmennei Street, Xicheng District, Beijing 100031, the PRC by post or by facsimile (Fax no.: (+86)-10-6641 2321). Failure to sign and return this reply slip, however, will not preclude an eligible shareholder from attending the EGM.

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