Organic Rankine cycle (300, 400, 500) comprising: - an evaporator where the pressurized fluid is heated, vaporized and brought into subcritical or supercritical conditions using the heat of a source; - a turbine where the fluid while expanding provides the useful work of the cycle; - at least one pump (5, 5 ') where the liquid is brought from the pressure of at least one condenser (4, 4') to the evaporator pressure; - a pre-heater, which using the same source supplies heat to the working fluid, bringing it to a temperature close to the vaporization temperature, said organic Rankine cycle (300, 400, 500) being characterised by - a first recuperator which receives a first portion of organic fluid vapor extracted from the turbine, and is connected to a first condenser, by means of a first circuit at medium pressure, wherein medium pressure is the working fluid pressure at a stage of the cycle where the entire enthalpy drop of the turbine has not been processed, and the first medium pressure circuit originates at the midpoint of the turbine where the entire enthalpy drop has not been processed and includes the first recuperator and the first condenser; - at least one second recuperator (3 ', 403', 404 ') which receives a second portion organic fluid vapor leaving the turbine and is connected to a second condenser, by means of a second low pressure circuit, wherein low pressure is the working fluid pressure at a stage of the cycle where the entire turbine enthalpy drop has been processed, and the second low pressure circuit originates at the turbine outlet at the point where the entire enthalpy drop has been processed and includes the second recuperator and the second condenser; at least one further pre-heater (301, 301') positioned in parallel with one or both of said first and second recuperator (3, 3'). - an evaporator where the pressurized fluid is heated, vaporized and brought into subcritical or supercritical conditions using the heat of a source; - a turbine where the fluid while expanding provides the useful work of the cycle; - at least one pump (5, 5 ') where the liquid is brought from the pressure of at least one condenser (4, 4') to the evaporator pressure; - a pre-heater, which using the same source supplies heat to the working fluid, bringing it to a temperature close to the vaporization temperature, said organic Rankine cycle (300, 400, 500) being characterised by - a first recuperator which receives a first portion of organic fluid vapor extracted from the turbine, and is connected to a first condenser, by means of a first circuit at medium pressure, wherein medium pressure is the working fluid pressure at a stage of the cycle where the entire enthalpy drop of the turbine has not been processed, and the first medium pressure circuit originates at the midpoint of the turbine where the entire enthalpy drop has not been processed and includes the first recuperator and the first condenser; - at least one second recuperator (3 ', 403', 404 ') which receives a second portion organic fluid vapor leaving the turbine and is connected to a second condenser, by means of a second low pressure circuit, wherein low pressure is the working fluid pressure at a stage of the cycle where the entire turbine enthalpy drop has been processed, and the second low pressure circuit originates at the turbine outlet at the point where the entire enthalpy drop has been processed and includes the second recuperator and the second condenser; at least one further pre-heater (301, 301') positioned in parallel with one or both of said first and second recuperator (3, 3').