Abstract: The vapour power plant with hermetic turbogenerator is claimed, such plant provided with the main thermal cycle that works with the low boiling point fluid, and characterized by an additional, internal working fluid cycle that serves to lubricate the slide bearings contained in said hermetic turbogenerator, said additional working fluid cycle consisting of the slide bearings supplying piping connected to the main working fluid cycle at the main cycle pump outlet, of the slide bearings housing, of the return piping that directs the main portion of the working fluid liquid from said slide bearing housing to the working fluid buffer container, and of the emergency slide bearings supply piping that connects said working fluid buffer container, through the emergency slide bearing supply pump, with said slide bearings supply piping, whereby non-return valves are provided before connection point of said slide bearings supply piping and said emergency slide bearings supply piping.