Vehicle-to-grid explained without the hype
V2G lets a parked vehicle send power back out — to your building or the grid. Here's the honest version of what it is and where it stands.
Last updated 15 August 2026
Vehicle-to-grid is one of the most talked-about ideas in fleet electrification, and one of the most over-promised. Here’s the plain version.
What it actually is
Normal charging is one-way: power flows into the vehicle. Vehicle-to-grid (V2G) — part of a wider family called V2X — lets power flow out of a parked vehicle’s battery too, back to your building or the grid. Because a depot fleet sits idle for long stretches, all that parked capacity could, in principle, be tapped when it’s valuable and topped up when power is cheap.
The appeal
It’s the same logic as an on-site battery, but using the batteries you’ve already paid for in the vehicles. In theory it could shave your peaks, store cheap energy, or earn flexibility income — turning a parked fleet into a revenue-generating asset.
The honest status
In practice, V2G needs specific vehicles and chargers that support bidirectional power, plus commercial arrangements to make it pay — and those pieces are arriving, not universal. There are live projects, but for a depot buying today it’s an emerging capability to watch rather than a feature to build the plan around.
What to do about it now
Get your smart-charging foundation right — it delivers most of the available value today. Keep V2G on the radar, and if you’re curious whether it’s worth planning for, that comes down to your vehicles, your chargers and the economics. Treated honestly, V2G is a promising direction, not a finished product.