Hong Kong Exchanges and Clearing Limited and The Stock Exchange of Hong Kong Limited take no responsibility for the contents of this announcement, make no representation as to its accuracy or completeness and expressly disclaim any liability whatsoever for any loss howsoever arising from or in reliance upon the whole or any part of the contents of this announcement.



(Stock Code: 902) POWER GENERATION WITHIN CHINA FOR THE FIRST QUARTER OF 2015

This announcement is made pursuant to Rule 13.10B of the Rules Governing the Listing of Securities on The Stock Exchange of Hong Kong Limited.
Huaneng Power International, Inc. (the "Company") announces its power generation for the first quarter of 2015.
According to the Company's preliminary statistics, as of 31 March 2015, the Company's total power generation by the power plants within China on consolidated basis amounted to 82.545 billion kWh, representing an increase of 6.81% over the same period last year. Total electricity sold by the Company amounted to 77.992 billion kWh, representing an increase of 6.64% over the same period last year.
The increase in power generation of the Company was mainly attributable to the acquisition of power plants from its parent company and the generation units which have been recently put into operation.
The decrease in the power generation of some power plants as compared with the same period of last year was attributable to the major reasons: Firstly, in the first quarter of 2015, the economy in China continued to grow slowly, with the deepening of the country's economic restructuring as well as continuing decline in the growth of the power consumption nationwide, the power generation in the areas where the Company's coal-fired generating plants are located decreased correspondingly on consolidated basis over the same period last year. Secondly, the commencement of operation of a number of ultra-high voltage west-to-east power transmission lines in China reduced the power generation market of thermal power generating units in the southeast coastal regions where a high proportion of thermal power generating units of the Company are located, thereby having a relatively greater impact on the Company. Thirdly, the commencement of operation of many hydropower generating units in the southwest region as well as the abundant water supply in the same region contributed to a significant increase in hydro-power generations, which has reduced the power generation market of thermal power generating units in Yunnan Province as well as Shanghai, Zhejiang, Jiangsu and Guangdong where the excessive hydro-powers generated in the southwest

- 1 -

region were provided. Meanwhile, power output from thermal power generating units in Liaoning and Fujian were affected by the commencement in the operation of large nuclear generating units in these two provinces.
The power generation and electricity sold by each of the Company's domestic power plants for the first quarter of 2015 are listed below (in billion kWh):

- 2 -

Power generation for the

Power generation for the

Electricity sold for

Electricity sold for

Domestic Power Plant

first quarter of

2015

first quarter of

2014

Change

the first quarter of

2015

the first quarter of

2014

Change

Tianjin

Yangliuqing Co-generation

1.758

1.880

-6.48%

1.635

1.740

-6.00%

Lingang Combined Cycle

0.078

-

-

0.076

-

-

Shanxi Province

Yushe

0.548

0.578

-5.25%

0.510

0.535

-4.77%

Zuoquan

1.104

1.508

-26.79%

1.034

1.417

-27.06%

Shandong Province

Dezhou

3.535

3.325

6.32%

3.310

3.114

6.30%

Jining

1.277

1.349

-5.38%

1.193

1.262

-5.46%

Xindian

0.833

0.828

0.59%

0.780

0.776

0.56%

Weihai

2.274

2.647

-14.09%

2.160

2.523

-14.36%

Rizhao Phase II

1.824

2.084

-12.41%

1.733

1.983

-12.63%

Zhanhua Co-generation

0.348

0.443

-21.52%

0.318

0.406

-21.79%

Henan Province

Qinbei

4.512

5.326

-15.29%

4.266

5.073

-15.91%

Jiangsu Province

Nantong

1.863

1.728

7.81%

1.781

1.646

8.18%

Nanjing

0.912

0.915

-0.33%

0.864

0.867

-0.39%

Taicang

2.448

2.771

-11.66%

2.333

2.642

-11.71%

Huaiyin

1.724

1.510

14.15%

1.633

1.421

14.92%

Jinling (Combined Cycle)

0.359

0.446

-19.57%

0.351

0.436

-19.52%

Jinling (Coal-fired)

2.967

2.909

1.99%

2.829

2.783

1.68%


- 3 -

- 4 -

Note: The remarks * represented the power plants acquired from parent company in 2014 and the relevant figures (which have not been consolidated into the statistics for 2014) are for reference only.

- 5 -

The accumulated power generation of Tuas Power Limited in Singapore, which is wholly owned by the Company, accounted for a market share of 21.9% in Singapore in the first quarter of 2015, representing an increase of 0.7 percentage point compared to the same period last year.
By Order of the Board Huaneng Power International, Inc. Du Daming

Company Secretary

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

(Executive Director)

Guo Junming

(Non-executive Director)

Liu Guoyue (Executive Director) Li Shiqi

(Non-executive Director)

Huang Jian

(Non-executive Director)

Fan Xiaxia (Executive Director) Mi Dabin

(Non-executive Director)

Guo Hongbo

(Non-executive Director)

Xu Zujian

(Non-executive Director)

Li Song

(Non-executive Director)

Li Zhensheng

(Independent Non-executive Director)

Qi Yudong

(Independent Non-executive Director)

Zhang Shouwen

(Independent Non-executive Director)

Yue Heng

(Independent Non-executive Director)

Zhang Lizi

(Independent Non-executive Director)

Beijing, the PRC
16 April 2015

- 6 -

distributed by