A mobile energy storage system and a method are provided for supplying power to entities at disparate locations. The system includes a set of vehicles. Each of the vehicles in the set includes a battery set having one or more batteries for storing power. Each of the vehicles in the set further includes a power connector having an end connected to the battery set and another end for connecting to a power transfer switch at the entities. The system also includes a central server for scheduling vehicles in the set to provide power to the entities responsive to energy charging requests issued by the entities.