Power control system and power control method

A power control system comprising:

• a monitoring unit configured to monitor a generated electrical power amount which is generated by a power generation device using renewable energy and a purchased electrical power amount purchased by a consumer via an electric power grid;
• a storage amount acquisition unit configured to acquire a storage amount of a storage battery;
• a storage amount target value setting unit configured to set a storage amount target value which is a target value for the storage amount;
• and
• a power storage controller configured to execute:
• first processing of discharging from the storage battery in a first case of the purchased electrical power amount being at least a first threshold;
• second processing of charging to the storage battery in a second case of the generated electrical power amount being greater than 0 and the purchased electrical power amount being no more than a second threshold which is a threshold smaller than the first threshold;
• and third processing of conducting charging and discharging of the storage battery so that the acquired storage amount becomes the storage amount target value in cases other than the first and second cases, wherein
• a power generation amount of the power generation device is controlled so as to increase the purchased electrical power amount, in a case of the purchased electrical power amount remaining no more than the second threshold even after performing the second processing.