NOVELTY - The method involves compressing used refrigerants by a factor of about 15 to 25, and conveying and bottom-heating the compressed refrigerants by a recuperator (17). The highly compressed bottom-heated refrigerants are conveyed by a heat exchanger i.e. preheating unit (12), and preheated. The highly compressed and preheated refrigerants are conveyed through another heat exchanger i.e. vaporization unit (11), and heated refrigerant vapor is vaporized. The heated refrigerant vapor is released in a turbine (18) i.e. turbo expansion machine. Released energy is utilized to drive a generator (19).    USE - Method for generating electric current from waste heat of a block-type thermal power station and a biogas plant by organic rankine cycle process.    ADVANTAGE - The method ensures simple transportation and storage of the refrigerant, and enables facilitating significant aspect for the security of the plant. The refrigerant is non-toxic, and has characteristic solvent odor, thus recognizing leakages in the plant in a simple and quick manner. The used refrigerant is chemically stable, and not aggressive to different materials, thus avoiding utilization of gas containers. The method enables reducing temperature of waste heat from 500 degree Celsius to about 120 to 170 degree Celsius in a simple and inexpensive manner, and avoiding additional costly refrigeration of waste heat before the waste heat is conveyed into chimney and ozonosphere damage. The two-stage structure of the refrigerant vaporizer enables a compact and space-saving construction of the device.    DETAILED DESCRIPTION - The refrigerants are azeotrophe mixture based on perfluoropolyether and pentafluorobutane. An INDEPENDENT CLAIM is also included for a device for generating electric current from waste heat.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of an apparatus for recovery of waste heat from exhaust gases.    Vaporization unit (11)    Preheating unit (12)    Recuperator (17)    Turbine (18)    Generator (19)