Power management system

A power management system includes: a server that manages a status of reservation for use of a shop by a user who uses an electrically powered vehicle in which a battery is mounted and that performs supply/demand adjustment for power in a power grid connected to the shop; and a power charging/discharging station installed in a parking lot of the shop and connected to the power grid. The server performs the supply/demand adjustment using the battery of the electrically powered vehicle while the battery and the power charging/discharging station are connected to each other after the reservation for the use of the shop is made by the user.