Method and exergy power plant for decentralised power generation

The method involves displaceably arranging piston (15) of drive unit (20,21) in power plant (43), such that piston is mounted axially in pressure vessel (1). The piston displacement in gas space (16) into two variable-volume chambers (16a,16b) is performed. The impeller turbine is coupled with electric generators, to generate and transport electricity. The transformation of state variable pressure energy into specific technical work is performed, so that energy amount is irreversibly entrained in steady-flow process and is discharged as energy in form of heat to ambient temperature. An independent claim is included for energy power plant.