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Experimental data on a gas discharge obtained for comparatively high currents (4–11 A), powers (5–15 kW), and current density at a liquid cathode (0.8–1.0 A/cm2) are presented. As the electrolyte, a solution of sodium salt in distilled water was used. The losses on the liquid cathode were significantly diminished by decreasing its electric resistance. Regimes in which the thermal efficiency of a discharge apparatus is equal to ∼80% have been determined.