Charge and discharge control device, discharge lower limit setting device, charge and discharge control method, and recording medium

A charge and discharge control device that controls charge and discharge of an electric vehicle in a residential complex that includes a charge and discharge facility, the charge and discharge control device comprising:

• a first obtainer that obtains a power consumption of the residential complex;
• a first storage that stores first history information including a history of the power consumption of the residential complex;
• a predictor that predicts a first power consumption of the residential complex in future based on the first history information;
• a second obtainer that obtains storage battery information related to charge and discharge of a storage battery included in the electric vehicle;
• a second storage that stores second history information including a history of the storage battery information;
• a setter that sets a discharge lower limit based on the second history information when power is predicted to be scarce in a first period in future based on the first power consumption, the discharge lower limit indicating a remaining battery capacity at which to stop discharge performed for supplying power from the storage battery included in the electric vehicle to the residential complex in the first period;
• and
• a plan creator that creates a charge and discharge plan including the discharge in the first period, based on the first power consumption and the discharge lower limit.