The 120MW plant is scheduled to be finished in 2013 enlisting a total investment of $225m, reported US News.
District chief of police Major Theang Leng was quoted by the news agency that the collapse on 1 December resulted from too much water in the dam.
According to a local resident Yeat Thay, the accident had completely emptied the reservoir.
Meanwhile, hydropower development in Cambodia had faced criticism as poorly designed projects can lead to adverse environmental and social impacts in the region.
The company would build and operate the plant for 30 years following which ownership would be transferred to other interested parties.
