A power control apparatus includes: a power supply device including multiple power supply elements; a power consumption device; a battery independently arranged from the power supply device and the power consumption device; a supply and consumption balance adjustment device for controlling the power supply device and the battery to supply the electric power to the power consumption device; a prediction device for predicting electric power supply from at least a part of multiple power supply elements and electric power consumption of the power consumption device; a guard value setting device for setting a guard value of a charging and discharging operation of the battery according to a prediction result of the prediction device; and an output device for outputting the guard value to the supply and consumption balance adjustment device.