A scalable transverse self‐sustained discharge maintained between an array of flow‐stabilized cathodes and a common anode has demonstrated specific input powers of 800 W/g/sec and power densities of 100 W/cm3per cathode for CO2‐N2‐He mixtures at pressures of 50–70 Torr. Optical extraction at 15&percent; efficiency has been obtained under nonoptimized conditions in a geometry with the parallel fluid flow and discharge electric field perpendicular to the optical axis.