Cogeneration method, according to which a hot source (2) produces steam that is released in at least one turbine (3) having a low-pressure steam outlet (5) linked to a condenser; at least a fraction (Q) of the steam leaving the turbine (3) is directed towards a Venturi thermocompressor (14) into which a fluid having higher pressure and temperature than the outgoing steam is injected, resulting in a fluid having higher pressure and temperature than the outgoing steam, and this mixture is directed towards a second condenser (21) where the heat of the mixture is transferred to an auxiliary fluid of a circuit (23) external to the thermodynamic cycle.