Supplemental Notice of 2015 Fourth EGM

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Datang International Power Generation Co., Ltd.

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

(Stock Code: 00991)

SUPPLEMENTAL NOTICE OF
2015 FOURTH EXTRAORDINARY GENERAL MEETING

Reference is made to the Notice of 2015 Fourth Extraordinary General Meeting (the "EGM") of Datang International Power Generation Co., Ltd. (the "Company") dated 5 November 2015 (the "EGM Notice").

After the date of the EGM Notice, the board of directors of the Company (the "Board") received from its controlling shareholder, China Datang Corporation ("CDC"), a proposal letter for adding additional resolutions for the consideration and approval by the shareholders of the Company (the "Shareholders") at the EGM. Details of the proposal are as follows:

Since the "Resolution on the Provision of Guarantee on the Financing of Datang Energy and Chemical Company Limited" was considered and approved at the twenty-seventh meeting of the eighth session of the Board, it is proposed by CDC to be considered and approved as an additional ordinary resolution by the Shareholders at the EGM.

SUPPLEMENTAL NOTICE IS HEREBY GIVEN that the EGM of the Company will be held at Summer Room of 2/F, The Westin Beijing Financial Street, No. 9B Financial Street, Xicheng District, Beijing, the People's Republic of China (the "PRC") on 22 December 2015 (Tuesday) at 9:30 a.m. to consider and, if thought fit, pass the following additional resolution:

ORDINARY RESOLUTION

3. To consider and approve the "Resolution on the Provision of Guarantee on the Financing of Datang Energy and Chemical Company Limited" (Note 2)

By Order of the Board
Ying Xuejun
Acting Company Secretary

Beijing, the PRC, 2 December 2015

Notes:

1. Save as the additional resolution and other information as set out in this Supplemental Notice of 2015 Fourth General Meeting, all the information set out in the EGM Notice remains unchanged.

2. The Company has agreed at the twenty-seventh meeting of the eighth session of the Board to provide joint and several guarantee, the principal of which being of not more than RMB4 billion for the financing of Datang Energy and Chemical Company Limited ("Energy and Chemical Company") according to actual needs, as the financing of Energy and Chemical Company will be mainly used for Energy and Chemical Company's expenses and financing, such as repayment of due borrowings and payment of interests.

For details of the provision of guarantee for the above financial leasing, please refer to the relevant announcement of the Company dated 24 November 2015.

3. Other Matters

(1) Each of the holders of H shares entitled to attend and vote at the EGM, is entitled to appoint one or more proxies to attend and vote on his/her behalf at the meeting. A proxy need not be a shareholder of the Company.

(2) If holders of H shares have appointed more than one proxy to attend the EGM, the proxies can only exercise their voting rights by way of poll.

(3) To be valid, holders of H shares must deliver the Revised Proxy Form (as define below), and if such revised proxy form is signed by a person on behalf of the appointer pursuant to a power of attorney or other authority, a notarised copy of that power of attorney or other authority, to the Company's H share registrar, Computershare Hong Kong Investor Services Limited at 17M Floor, Hopewell Centre, 183 Queen's Road East, Wanchai, Hong Kong, in not less than 24 hours before the time scheduled for holding the EGM.

(4) A revised proxy form for use at the EGM (the "Revised Proxy Form") is published on the websites of The Stock Exchange of Hong Kong Limited (www.hkexnews.hk) and the Company (www.dtpower.com). The Revised Proxy Form shall supersede and replace the proxy form enclosed with the EGM Notice dated 5 November 2015 (the "Previous Proxy Form") and that the Previous Proxy Form shall be invalid. Shareholders who have signed and returned the Previous Proxy Form should complete and return the Revised Proxy Form in accordance with the instructions provided in this Supplemental Notice of 2015 Fourth Extraordinary General Meeting. Completion and return of the Revised Proxy Form will not preclude a Shareholder from attending and voting at the EGM in person.

(5) The EGM is expected to last for an hour. Attending shareholders and their proxies shall be responsible for their own travel and accommodation expenses.

The Company's office address:

No. 9 Guangningbo Street, Xicheng District,
Beijing, the PRC Postcode: 100033
Telephone: [phone] or (8610) 8800 8682
Fax: [phone]

As at the date of this supplemental notice, the directors of the Company are:

Chen Jinhang, Hu Shengmu, Wu Jing, Liang Yongpan, Ying Xuejun, Cao Xin, Cai Shuwen, Liu Haixia, Guan Tiangang, Yang Wenchun, Jiang Guohua*, Feng Genfu*, Luo Zhongwei*, Liu Huangsong*, Jiang Fuxiu*

* Independent non-executive director