GM-Funded Study Puts Vehicle-to-Grid at $680 to $2,750 per EV a Year
- Analysis EVs Infrastructure & Grid Connection
Marin Holt
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- 9 minutes read
- V2G value per EV: $680 to $2,750 per year
- One-way managed charging: $100 to $450 per year
- US opportunity: $7 billion by 2030
- GM bidirectional fleet: 250,000 EVs on US roads
GM Energy has published a study that puts a hard number on bidirectional charging. Consultancy E3 finds a vehicle-to-grid EV is worth $680 to $2,750 a year to the grid and its owner. One-way managed charging on the same vehicle returns $100 to $450. That gap runs 5 to 15 times, depending on the market. E3 sizes the national opportunity at roughly $7 billion by 2030.
E3 ran the numbers in RESHAPE-EV, an in-house model that builds charging patterns from the behavior of thousands of individual drivers. The model accounts for home charging access, vehicle type and regional power costs. It covers nine US wholesale markets, with WECC split into three subregions, and applies 2030 price forecasts to each one. The study was commissioned by GM Energy and released in late July 2026.
Where the money is
| Market | V2G value per vehicle, per year (2030) |
|---|---|
| California, downstate New York, Pacific Northwest, Rocky Mountain | $2,200 to $2,750 |
| ERCOT (energy-only market) | $2,270 |
| Remaining WECC zones | $1,700 to $2,200 |
| Southeastern US | About $700 |
| One-way managed charging, all markets | $100 to $450 |
The spread matters more than the headline average. A vehicle in the Southeast earns about a quarter of what the same vehicle earns in California. Market structure, not battery chemistry, drives that difference.
E3 also changed where the value comes from. Capacity payments, transmission and distribution deferral, and discharge during peak hours carry most of the benefit. Energy arbitrage, the old pitch for storage, shrinks by 2030. Utility-scale batteries narrow the price spreads that arbitrage feeds on, so a car competes for a thinner margin.
GM has hardware in the field to back the argument. The automaker says more than 250,000 bidirectional-capable EVs already run on US roads. It has committed to the capability on all currently planned models. It has 52,000 vehicles slated for a Pacific Gas and Electric program by 2030. GM used the study to press utilities on tariffs, permitting and program enrollment.
The Gap
Read the source of the funding first. GM sells the vehicles and the hardware that this value depends on. That does not make the modeling wrong, and E3 is a serious shop, but the framing is a policy ask aimed at utility commissions.
Three things the study does not settle. First, the top-end numbers assume payments high enough to attract owners, which is a tariff design that mostly does not exist yet. Second, the figures are gross grid and customer value. They are not net of charger cost, degradation, or the interconnection study a bidirectional charger triggers. Third, enrollment attrition goes unpriced. A program that pays $2,200 a year is worth nothing on a vehicle whose driver opts out in month four.
The regulatory barrier is also the finding. GM points at pilot rules and export compensation as the limit on value capture. Put plainly, the $7 billion is a forecast about state commissions, not about cars.
Why It Matters
For fleet and facility operators, this study reprices a decision that used to be simple. One-way managed charging was the safe default, because it needs no export approval and no bidirectional hardware. At $100 to $450 a vehicle, that default now looks like leaving most of the value on the table in capacity-short markets.
The screening question is regional. In CAISO, NYISO and ERCOT, the numbers justify the interconnection paperwork on a depot-scale fleet. In the Southeast, at about $700 a vehicle, they mostly do not. Before signing a V2G pilot, ask the utility three things. What is the export compensation rate? Does the tariff survive the pilot phase? Who pays for the bidirectional charger? The answers, not the model, decide the payback.
Critical Perspective
The number that matters to an owner is not the number in the study. E3 modeled value to the grid and the customer combined. Who captures it is a separate fight among the driver, the aggregator and the utility, and that split is set by tariff, not by physics. A $2,750 figure that arrives as $400 on a bill changes the payback entirely.
The top-end estimates also carry a circular assumption. They hold only where payments run high enough to attract owners, which is the tariff that does not exist yet. The study then cites the absence of that tariff as the barrier. That is a coherent policy argument, but it is not a forecast an operator should budget against.
One finding cuts against the pitch and deserves more attention than GM gave it. E3 expects energy arbitrage value to shrink by 2030 as utility-scale batteries narrow price spreads. The same logic applies to capacity value, which carries most of the remaining benefit. If storage build-out is fast enough to flatten arbitrage, it also competes for the capacity payments that make the $2,750 case work.
Sources
- E3 Quantifies the Grid and Customer Value of Vehicle-Grid Integration for GM Energy, E3
- A new study shows why vehicle-to-grid matters now, GM News
- V2G could deliver 15 times more value than one-way managed EV charging: report, Utility Dive
- GM Energy calls for vehicle-to-grid collaboration to cut grid costs by up to $7 billion per year, pv magazine USA
