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Your fleet is a battery. Model the net P&L before you sign.
"Commercial V2G is live. BMW, E.ON, Nissan, BYD, and Xos have all launched or committed to V2G products in 2025-2026. The offers look attractive. The headline revenue figures are gross. The fleet manager who signs on gross figures without modelling net P&L is not making a fleet decision. They are making a bet."
0.3%/yr
Additional battery degradation from smart V2G management. Calendar aging at 100% SOC causes 20x more wear. (Sagaria et al., Applied Energy, 2024)
80%
AC round-trip efficiency on V2G. Every kWh exported gross = 0.80 kWh net. This ratio is not disclosed in most commercial V2G offers.
THE DECISION STAKES
The revenue is gross. The risk is net.
"V2G is a fundamental shift in how commercial fleets create value. We are turning new Xos-powered depots into a grid asset. With production beginning this April, we're delivering the ability to generate revenue, cut peak demand costs, and strengthen community energy resilience without adding complexity to daily operations." — Dakota Semler, CEO Xos, March 10, 2026
The V2G P&L that matters is not gross revenue minus charging cost. It is net kWh at 80% efficiency, minus BMS overhead, minus modelled battery depreciation, with a contractual warranty that bounds the degradation liability.
The fleet that builds this model before signing captures the upside. The fleet that signs on headline gross figures accumulates a liability it has not yet priced.
THE DECISION TOOL
Four moves. One decision you can defend.
01
NET
Recalculate every gross revenue figure at 80% round-trip efficiency. Apply to annual vehicle cycles: if the offer cites €720/yr gross, model €576/yr net before any other deduction. This is the revenue floor your CFO signs off on.
The aggregator's margin lives in the gap between the grid price and what the fleet receives. If you do not model this gap, the aggregator models it for you.
02
PROTECT
Require a SOC window covenant: 30 to 50% SOC during grid export, never above 80% when idle. This single parameter keeps V2G degradation at 0.3%/yr. Calendar aging at 100% SOC is the real enemy.
An agreement without a SOC window covenant exposes the battery to conditions the warranty was not designed to cover. Require it as a contractual standard.
03
WARRANT
Require a MWh-throughput clause in the EV procurement RFP and in the V2G service agreement. The standard in stationary storage is 40,000 MWh or 10 years. Ask every OEM: what is the equivalent for V2G-enrolled vehicles? Until you have a written answer, residual value at end of contract is undefendable.
The fleet that requires the MWh warranty clause in every RFP forces the market to produce it. Procurement is the fastest route to the standard.
04
STRESS
Run the downside before the base case: battery degrades 2% faster than warranted, grid prices fall 20%. At what net P&L per vehicle per year does V2G still cover its cost of capital? If you cannot answer this, do not sign.
The downside scenario is not pessimism. It is the number your CFO needs to approve the programme on the balance sheet, not just in the fleet budget.
BMW / E.ON
Germany's first commercial V2G product for private customers. BMW iX3 + E.ON V2G tariff, launched 9 February 2026.
€576
Net annual revenue per vehicle after 80% round-trip efficiency, calculated from the BMW/E.ON gross offer of €720/yr at €0.40/kWh. This is the number that belongs in the fleet P&L. The €720 headline figure belongs in the press release. (BMW Group press release, 9 February 2026)
BMW and E.ON have delivered the clearest commercial V2G proof point in Europe: a live product, a confirmed tariff, and an explicit battery lifetime commitment. The launch validates that commercial V2G works. It also clarifies the actuarial question the fleet manager must answer independently: at €0.40/kWh gross and 80% round-trip efficiency, net revenue is €0.32/kWh. At a typical annual V2G throughput of 2,250 kWh per vehicle, gross is €900. Net is €720. After degradation provision at the €132/MWh break-even rate (Sagaria et al.), the defensible net P&L is approximately €420 per vehicle per year. That is still a positive case. But it is a materially different conversation than the headline figure.
BMW/E.ON proved V2G works commercially. The fleet manager's job is to model what it earns net, after efficiency losses and degradation provision, before committing the balance sheet.
Download the full case
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Key questions
At what grid price does V2G stop being financially viable for the fleet operator?
Will OEMs produce MWh-throughput warranties before fleet operators are locked into V2G agreements without them?
How does the V2G P&L change when grid prices fall — and who absorbs the downside?
Pre-decision checklist
NET — completed
PROTECT — completed
WARRANT — completed
STRESS — completed
By Fabrice Macarty
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