POWER CONTROL SYSTEM

An example method includes monitoring a state of charge of one or more energy storage devices that are part of an uninterruptable power supply (UPS) that is connected electrically to a power distribution grid; obtaining information that is based, at least in part, on a voltage on the power distribution grid; and outputting a control signal that is based on the state of charge and the information. The control signal is for controlling power electronics either to output voltage from the one or more energy storage devices to the power distribution grid or to charge the one or more energy storage devices using voltage from the power distribution grid.