A study of this combined process revealed the role of gas generation during electrical breakdown of the electrode gap. It is shown that the increase in the gas content initiates discharge phenomena and leads to an increase in the proportion of erosion removal in the combined process. The possibility of effectively controlling the EECM process by using the low-voltage component of the voltage and the amplitude and repetition frequency of the high-voltage pulses as the controlling hydrodynamics parameters is confirmed experimentally.