condenser 22 is employed rather than a surface condenser the jet conduit of the mixing condenser being designated by the reference character 23 the outlet of the mixing condenser 22 is connected through a pipe conduit 24 a pump 25 and an air cooler 26 to the jet conduit 23 the jet conduit 23 has a branching off 27 the latter leads into the pipe conduit 10 which in turn is connected with the work gas cooling heat exchanger 5 the branching off 27 includes a pump 28 the operation of the above described embodiment of the power plant according to the invention differs from that of the previous one in that the mixture consisting of water injected through the jet conduit 23 and of the vapour exhausted from the vapour turbine 12 and condensed in the mixing condenser 22 is circulated by the pump 25 through the air cooler 26 one portion of the circulated mixture is conveyed back into the mixing condenser 22 in the form of injected water another portion which corresponds to the amount of precipitated vapour is conveyed by the pump 28 back through the branching off 27 and the pipe conduit 10 to the heat abduction side of the work gas cooling heat exchanger 5 furthermore it is possible to separate a portion of liquid from the liquid flow in the jet conduit 23 which corresponds to the amount of vapour introduced into the pipe conduit 11.