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In this paper, a novel control method using seawater desalination plant instead of battery energy storage system as a controllable load, to suppress the frequency fluctuation is proposed. A high pressure pump is usually installed for reverse osmosis method in the desalination plant. In this research, it is assumed that the power consumption of the high pressure pump can be changed continuously and rapidly through the control of inverter. Since every seawater desalination plant has a storage tank of the produced fresh water, the power consumption of motor can be changed without affecting its daily production. The new method is proposed in this paper for securing regulating capacity while taking into account customer's convenience. A linearized power system model was used to calculate the system frequency or regulating capacity. The results of the study indicate that the fluctuation of the system frequency can be suppressed by the control of power consumed by seawater desalination plant.