This paper describes extinguishing experiments to verify the possibility of increasing the fire-extinguishing efficiency of low-, medium- and high-pressure water mist by its charging by the electric field of high DC voltage. The experimental results confirmed the effects of the electrical voltage, the configuration of electrodes (anode, cathode), the volumetric water flow rate, water pressure and the type of mist nozzle. Higher fire-extinguishing effect of electrically-charged water mist was shown by a shorter extinguishing time, a smaller volume of water to extinguish the fire and a higher percentage of successful extinguishing attempts. Benefit: faster and more efficient fire-fighting with a smaller risk of injury of persons and smaller subsequent damage in the protected space.