Huaneng Power International, Inc. is principally engaged in the investment, planting, operation and management of power plants. The Company's electricity generation business covers the Northeast China Grid, the North China Grid, the Northwest China Grid, the East China Grid, the Central China Grid and the South China Grid, as well as grid in Singapore. During the year ended December 31, 2008, the Company together with its subsidiaries, generated approximately 184.6 billion kilowatt-hours. As of December 31, 2008, the Company wholly owned 17 operating power plants and had controlling interests in 13 operating power plants and minority interests in five operating power companies within China. Its power plants were located in 12 of China's provinces, including Liaoning, Hebei, Henan, Gansu, Shandong, Shanxi, Jiangsu, Zhejiang, Jiangxi, Hunan, Fujian and Guangdong, and in Shanghai and Chongqing Municipalities. It also had a wholly owned power subsidiary in Singapore.