The main topic of my master thesis is the economy of facultative reinsurance from the point of view of a reinsurance company. First, the thesis briefly deals with the general structure of reinsurance and then is focused only on the facultative part. The thesis puts emphasis on the specific characteristics of facultative reinsurance and the creation of reinsurance slip and then uses this knowledge in a case study. The case study shows the risk from the insurance company and reinsurance company side and its aim is to create proper reinsurance structure for a power plant in Bulgaria. The thesis finishes with a chapter about the development of several reinsurance companies in the market.