A compact gas turbine installation is described in which, to be compact and easier, the blades of the gas turbine (GT) (void inside) are mounted at the periphery of the rotor of the centrifugal air compressor (AC) with a single compression stage. The air, partially compressed in the AC rotor, is passed and compressed further in the channels of the blades of the GT and is admitted into the toroidal combustion chamber (CC). The flue gas produced in the CC passes through the GT nozzles and the channels between their blades, and then it is exhausted from the installation. A slight preheating of the air takes place in the channels of the GT blades before its admission into the CC.