HICL Infrastructure has acquired an additional 3.4% stake in a Victorian desalination project for £25.2m.The beneficial interest, held via an Australian company, takes its overall stake in the public-private partnership project to around 9.3%.The purchase was funded from HICL's existing cash and debt resources.The project is the desalination plant in the southern hemisphere, capable of producing 444m litres of drinking water per day. It became fully operational in late 2012.