The invention relates to an exhaust turbocharger (1) of an internal combustion engine (2) having a compressor (3), and having a turbine (4), which comprises a turbine housing (5), wherein the turbine housing (5) comprises an evaporator (6), to which heat deriving from the exhaust gases of the internal combustion engine (2) can be admitted for the evaporation of a working fluid, and wherein the evaporator (6) is flow-connected to a line arrangement (7), in which a steam turbine (8) and downstream of that a condenser (9) are arranged, viewed in the direction of flow (S) of the working fluid.