China Three Gorges South Asia Investment Ltd, an offshoot of the world's largest hydropower operator China Three Gorges Corp, is to offer up to 19 percent of its equity to outside investors, according to a senior executive.

"We're diversifying our shareholding because CTG is dedicated to expanding internationally, and to transforming itself into a market-oriented business," said Wang Shaofeng, vice-president of China Three Gorges International Corporation.

CTG owns 70 percent of CSAIL, with the remainder split (15/15) between the Silk Road Fund, and IFC (International Finance Corporation), a member of the World Bank Group.