Netjoy Holdings Limited — Proxy Solicitation & Information Statement 2010

Jan 28, 2010

==> picture [373 x 79] intentionally omitted <==

Reply Slip for the 2010 First Extraordinary General Meeting

I/(We)

of Telephone number:

and Fax number:

,

being the holder(s) of H 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 2010 first extraordinary general meeting (the “EGM”) to be held at 1:30 p.m. on 16 March 2010 at the headquarters of the Company at West Wing, Building C, Tianyin Mansion, 2C Fuxingmennan Street, Xicheng District, Beijing, the People’s Republic of China.

being the holder(s) of

Signature:

Date:

Note: Eligible shareholders who wish to attend the EGM are advised to complete and return this reply slip to the Company at West Wing, Building C, Tianyin Mansion, 2C, Fuxingmennan Street, Xicheng District, Beijing 100031, the PRC by post or by facsimile (Fax no.: (+86)-10-66491860). Failure to sign and return this reply slip, however, will not preclude an eligible shareholder from attending the EGM.

* Please delete as appropriate.