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A large integration of renewable energy sources such as wind power generation and photovoltaic generation causes some problems in power systems, e.g., distribution voltage rise and frequency fluctuation. Battery energy storage system (BESS) is one of the effective solutions to these problems. Due to a high cost of the BESS, an application of controllable loads such as electric vehicle (EV) and heat pump water heater (HPWH) to the power system control is considered in this paper for reduction of the required capacity of the BESS. This paper proposes a new supplementary load frequency control (LFC) method by use of a number of both the EVs and the HPWHs as controllable loads. The effectiveness of the proposed LFC method is shown by numerical simulations conducted on the power system model with a large integration of wind power generation and photovoltaic generation.