Quick definition
Where V2H sends an EV's stored power into a single home, V2G takes that same underlying bidirectional capability further, sending power back into the broader utility grid instead. This turns a parked EV into a genuine grid resource, one that a utility can potentially draw on to help manage demand, particularly during periods when grid support is most valuable.
V2G typically operates through a formal utility program, with the vehicle owner opting in and often receiving payment or bill credit in exchange for making part of the battery's capacity available.
At a glance: V2G availability depends on a genuine combination of compatible vehicle, compatible equipment, and an active local utility program, a combination that's still expanding rather than broadly available everywhere yet. Beyond passenger vehicles, the U.S. Department of Energy's Alternative Fuels Data Center tracks state-level V2G activity like Maine's legislatively directed electric school bus V2G pilot feasibility study.
Why it matters
V2G represents a genuinely different kind of value proposition than V2H. Rather than benefiting only the vehicle owner's own home during an outage, V2G lets that same stored battery capacity provide value to the broader grid, potentially helping utilities manage demand during periods when additional supply is most needed. In markets where V2G programs exist, this can translate into real payments or credits for participating vehicle owners.
This broader grid-support role is exactly why V2G adoption depends on more than just vehicle and charger compatibility. A functioning V2G program also requires a utility actually set up to manage and compensate this kind of distributed, vehicle-based grid participation, a piece of infrastructure and program design that's still developing in many markets rather than a universally available option today. Pacific Gas and Electric's own vehicle-to-everything pilots, summarized by the California Public Utilities Commission, are a real illustration of this gap: as of the pilot's most recent public update, participating automakers still hadn't enabled full V2G functionality for the residential program specifically, even though the underlying vehicles and chargers were already deployed. To see V2G (vehicle-to-grid) in a real example, the battery charge time from solar calculator in our Battery & Storage section applies it to a working system.
As with V2H, the real tradeoff worth understanding is added battery wear against whatever compensation a program offers. V2G participation adds extra charge cycles to the vehicle's battery, which could contribute to somewhat faster capacity fade over time, a cost worth genuinely weighing against the specific financial benefit any given program provides before opting in.
Where you'll see this
The V2G vehicle to grid payback estimator works through the potential financial return from a specific V2G program.
Since both V2G and V2H add battery wear, the EV battery degradation vs home battery comparison compares that tradeoff against a dedicated home battery's own degradation profile.
This term comes up in utility grid modernization programs, in solar and EV integration planning, and any conversation about the broader role electric vehicles could play in supporting the grid beyond just personal transportation.
Related terms
Frequently asked
In markets and utility programs that support it, yes, V2G participation can generate real payments or bill credits in exchange for making a portion of the vehicle's battery capacity available to help support the grid. Availability and payment structure vary considerably by utility and region.
Not yet universally. V2G requires compatible vehicles, compatible charging equipment, and a utility program actually set up to support it, a combination that's still expanding rather than broadly available everywhere. Checking current program availability in your specific area is the reliable way to know what's actually accessible.
It adds extra charge cycles beyond normal driving use, similar to V2H, which could contribute to somewhat faster capacity fade over time. Any compensation offered for V2G participation is worth weighing against this real, if generally modest, added battery wear.
V2G sends power from the vehicle back to the broader utility grid, typically as part of a formal grid support program. V2H sends power specifically to the home it's connected to, most often for backup power during an outage, a related but genuinely different application.