Methods and systems for reconciling a charging event are disclosed. In an embodiment, a method establishes an identity tag at a grid connection point that uniquely identifies the point and receives tag information to uniquely identify the point at a mobile charging device. The method monitors charge event information indicating attributes of the charging event, associates event information with the identity tag information, and sends the information for reconciliation of billing accounts associated with the point and the mobile device. In another embodiment, a method receives an energy storage device for powering a mobile asset, couples the storage device to an electric grid during a connection event, realizes energy services from the connected storage device to the grid, determines a quantity of energy services realized by the storage device during the connection event, and reports the quantity of energy services realized and a unique identifier of the energy storage device.