Bidirectional charging, known as V2G (Vehicle to Grid), reverses the usual energy flow: instead of energy traveling only from the grid to the vehicle, the vehicle can return energy stored in its battery to the electrical grid, to a building, or to another system.
Technically, this requires both the charger and the vehicle itself to support bidirectional communication and conversion — something only a portion of today's electric vehicles support natively, though adoption is growing every year.
For a fleet, V2G opens up a compelling use case: vehicles that aren't out on routes can act as a distributed battery, helping reduce a building's peak consumption or even generating revenue by feeding energy back to the grid during periods of high demand.
While it's still an emerging technology, any company planning its charging infrastructure with a multi-year horizon should at least consider whether its charger and electrical installation leave the door open to adding V2G later on, without having to redo the entire installation.