FIELD: electrical engineering, generation of electric energy by energy system with fuel elements. SUBSTANCE: energy system includes unit of packages 220 of fuel elements, which operate at temperatures different for two or more packages of fuel elements. Package of fuel elements can contain several temperature zones 240, 242, 244 formed along axis of package, several packages of spatially spaced fuel elements can also be utilized to heat reagent from inlet to preset temperature. Packages of fuel elements show working temperatures basically from 20 C to 2000 C. EFFECT: enhanced efficiency of energy system. 151 cl, 17 dwg
