Methods, systems, and computer program products for preventing unauthorized movement of energy across grid networks due to portable storage devices are provided herein. A computer-implemented method includes dividing a portable energy storage device into multiple virtual energy storage sub-units, restricting each of one or more energy charging options to one or more distinct charging modes, restricting each of one or more energy discharging options to one or more distinct discharging modes, mapping, in accordance with one or more pre-defined rules, each respective one of the multiple virtual energy sub-units to at least one of one or more of the distinct charging modes and one or more of the distinct discharging modes, and automatically charging and automatically discharging the portable energy storage device based on the mapping and one or more contextual details.