The term VGI (Vehicle-Grid-Integration) was coined by the California Energy Commission in 2014. It describes how EVs can be aggregated to provide valuable services to the electric grid as well as to lower the Total Cost of Ownership (TCO) of an EV.

The figure above is meant as a initial taxonomy to better understand the terms.

V2L – Vehicle-to-Load
V2H – Vehicle-to-Home
V2B – Vehicle-to-Building
V2G – Vehicle-to-Grid (Transmission or Distribution grid)