Hydroelectricity power plant Kraljevac ( HE Kraljevac ) is the first powerplant on the river Cetina, situated close to village Zadvarje near city Omis. Long time ago this was the biggest hydropowerplant in the former Yugoslavia. Average flow is 80 m3/s, and high 1.200 m3/s. Afret building powerplant HE Zakučac 1962. i second part HE Zakučac 1980., and building HE Orlovac, the waterflow is minimised to the bilological minimum, used today. Today average flow is about 5 m3/s. HE Kraljevac is derivation type hidropowerplant. It is built in 1912. and 1932., and 1990. the powerstation is changed to the biological minimum size.