NOVELTY - The organic Rankine cycle (ORC) method for utilizing the waste heat from biomass- or biofuel combustion for generating electricity, comprises feeding the waste heat from the primary direct-energy generation from biomass or biofuel to an evaporator of an ORC-medium of a low temperature-ORC-system and feeding the evaporated ORC-medium of a turbine or an expander machine, which is connected with a generator for the production of electric energy. The evaporator is construed at the thermodynamically targeted enthalpy difference on the boiling curve before and after the evaporation.    USE - Organic Rankine cycle (ORC) method useful for utilizing the waste heat from biomass- or biofuel combustion for generating electricity.    ADVANTAGE - The organic Rankine cycle method ensures efficient and economical utilization of waste heat from biomass- or biofuel combustion.    DETAILED DESCRIPTION - The organic Rankine cycle (ORC) method for utilizing the waste heat from biomass- or biofuel combustion for generating electricity, comprises feeding the waste heat from the primary direct-energy generation from biomass or biofuel to an evaporator of an ORC-medium of a low temperature-ORC-system and feeding the evaporated ORC-medium of a turbine or an expander machine, which is connected with a generator for the production of electric energy. The evaporator is constructed at the thermodynamically targeted enthalpy difference on the boiling curve before and after the evaporation in which the evaporator is dimensioned and determined, where a controllable heat exchanger is arranged upstream of the evaporator, which is regulated to the difference in enthalpy between the pump and the entrance into the boiling curve of the evaporator. A further heat exchanger is provided after the relaxation of the ORC-medium towards a turbine or expander machine before introducing into the condenser and cools down the enthalpy differences between outlet turbine/expansion machine and to the saturated vapor point on the condensation line. The power of the controllable heat exchanger is regulated by the application of a recuperator so that the enthalpy difference between the inlet of the boiling curve of the evaporator and the outlet at the recuperator is adjusted/controlled over the heat exchanger. The cooling is carried out against outside air and heat reservoir. An INDEPENDENT CLAIM is included for ORC-arrangement for utilizing the waste heat from biomass- or biofuel combustion for generating electricity.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic representation of organic Rankine cycle system (Drawing includes non-English language text).