Vehicle-to-Grid (V2G)
The Future of Mobile Storage

What is V2G?

Vehicle-to-Grid (V2G) is the technology that allows an electric car's battery to return electricity to the grid or building. Unlike simple charging, V2G is bidirectional: electricity can flow both ways.

Three technological variants

• V2G (Vehicle-to-Grid): The car returns electricity to the public grid via the grid operator. Stabilizes the grid and accesses electricity markets. Complex regulation, centralized infrastructure.
• V2H (Vehicle-to-Home): The car exclusively powers your home. Discharges the battery to a home bidirectional inverter. No grid connection. Simpler technically and regulatorily.
• V2L (Vehicle-to-Load): The car powers portable devices via a specialized outlet (DC or AC). Limited power (1-11 kW). Useful for camping, tools, events.

V2G + Solar Synergies

Combining a solar installation and V2G (or V2H) creates a virtuous self-consumption loop by shifting usage over time.

Typical day scenario

Impact on self-consumption

• Without V2G/V2H: Solar self-consumption rate = 30-40% (surplus sent to grid). Remaining time: grid electricity.
• With V2G/V2H: Self-consumption rate = 70-90% (EV battery stores daytime surplus, returns at night). Drastic reduction in peak-hour electricity purchases.
• Economic gain: Avoid buying electricity at 0.25-0.30 €/kWh at night = significant annual bill savings.

Simplified flow diagram

V2G Market Status in 2025-2026

V2G infrastructure is gradually rolling out in France and Europe. Here are the standards, vehicles, and pilots to know.

Bidirectional technical standards

• CHAdeMO: Japanese fast-charging DC standard. Bidirectional since 2010. Used by Nissan Leaf (2012+), Mitsubishi i-MiEV, Subaru e-Boxer. Few V2G stations in France but historically the most mature.
• CCS / ISO 15118-20: European standard combining AC and DC charging. Bidirectionality rolling out 2025-2026. New preferred standard for V2G. Used by Hyundai Ioniq 5, Kia EV6, VW ID.4/ID.5 (with firmware update), BMW iX xDrive50, Mercedes EQE.
• GB/T: Chinese standard (China, Hong Kong). Not compatible with European infrastructure.

V2G/V2H compatible vehicles (2024-2026)

V2G pilots and services in France

• Dreev (Enedis partnership): V2G aggregation platform. Testing with Nissan Leaf, Hyundai Ioniq 5 in Île-de-France and Provence. Estimated compensation 200-300 €/year per participant.
• Nuvve: US V2G operator, pilot in France with electric utilities. Community projects.
• ADVENIR V2G Program: Subsidies for bidirectional Wallbox deployment (up to 40% help). Goal: 1,000 V2G points in France by 2025.
• Energy Partnerships: Volswagen-Elli (Germany), Hyundai-E.ON (Northern Europe), Nissan-Enel (Italy).

V2G Economic Model

V2G generates revenue through three complementary mechanisms.

Three revenue sources

• 1. Aggregation - Load shedding and price arbitrage: V2G aggregator proposes your battery to balance the grid or arbitrage spot prices.
  • Diffuse load shedding (consumption reduction): 20-40 €/MW/h in France
  • Spot price arbitrage (charge low, discharge high): 30-60 €/MW/h per EPEX Spot
  • Reserves (FCR/aFRR/mFRR): 5-15 €/MWh
• 2. Optimized solar self-consumption: Avoid buying electricity at 0.25-0.30 €/kWh. A 60 kWh EV battery used for V2H over 200 days/year = 3,000-3,600 €/year electricity avoided.
• 3. Grid auxiliary services: Voltage stabilization, reactive compensation. Low remuneration currently (~5 €/MWh) but growing.

Realistic annual estimate

• V2G alone (market aggregation): 200-500 €/year for a 60 kWh EV used 80% of the time. Heavily depends on operator and spot prices.
• V2H + solar (self-consumption): 1,500-3,000 €/year electricity avoided on bill + 100-200 € additional aggregation.
• V2G + V2H + solar combined: Maximum gain 2,000-4,000 €/year depending on consumption profile, sunlight, and installed solar power.

Infrastructure costs

• Bidirectional V2G Wallbox: 3,000-5,000 € (installation included). With ADVENIR: 1,800-3,000 € after subsidy.
• Bidirectional inverter (V2H home): 4,000-6,000 € additional if grid isolation needed.
• Bidirectional meter: Provided by distributor (Enedis), cost integrated in network access tariff.

Challenges and Limitations

V2G promises much but faces technical, regulatory, and durability obstacles.

EV battery degradation

Major debate: Does V2G accelerate EV battery wear?

• Arguments for (good news): V2G charge/discharge cycles typically shallow (10-30% capacity). IRENA (2020) and Nissan studies show shallow cycles = limited impact. A battery supporting 1,000 full cycles can support 5,000-10,000 cycles at 20%.
• Arguments against (risk): Each cycle slightly reduces capacity. Long-term (8-10 years), 10-20% loss possible if intensive V2G (> 100 cycles/year at 50% depth). Fast discharge battery temperature = additional thermal stress.
• Verdict: V2H (slow discharge, 1-2 kW) = negligible impact. V2G network (fast discharge, 10+ kW) = measurable but low impact with proper thermal management.

Fragmented regulatory framework

• France: AGEC law (2021) recognizes V2G/V2H but complex frameworks. V2G decrees being finalized. Bidirectional metering = administrative obstacle.
• Europe: Clean Energy Package directive (2019) authorizes V2G but each country implements differently. Germany/Netherlands ahead, France/Italy slower.
• Safety standards: ISO 15118-20, IEC 61851-24 finalizing. Risks: short-circuit, grid overload, involuntary disconnection.

Insufficient grid infrastructure

• Limited V2G/V2H Wallbox count (< 1,000 in France, ~10,000 in Europe).
• High installation cost and property owners often reluctant (condos, rentals).
• Need for bidirectional metering = request to distributor (Enedis), 2-4 month delay.

Manufacturer warranty

• Nissan: Covers battery degradation <5%/year with V2G via CHAdeMO. Hyundai/Kia: Explicit non-coverage V2G if early degradation. Tesla/BMW: Warranty doesn't mention V2G.
• Risk: If battery fails due to V2G, manufacturer may refuse replacement.

Early-stage economic model

• V2G revenues volatile (depend on EPEX spot prices). Poor long-term predictability.
• High fixed costs (Wallbox, bidirectional meter) vs. uncertain annual revenues.
• Few long-term contracts between aggregators and EV owners.

Learn More

Decision making

• V2H for solar self-consumption: Recommended if you have 6+ kWc solar, a CCS-compatible EV, and you'll stay 8+ years at this address. Payback 4-7 years.
• V2G for market aggregation: Wait for maturity (2026-2027). Pilot with Dreev if based in Île-de-France or Provence. Current revenues < 500 €/year.
• V2L in the meantime: If your EV supports V2L (Ioniq 5, EV6), you can power portable devices without costly infrastructure. No revenue but practical utility.

Key resources

• IRENA (2019): "Technology Roadmap - Electric Vehicles and the Power Grid"
• IEA (2021): "Global EV Outlook - Vehicle-to-Grid (V2G) deployment in selected markets"
• RTE (2024): Studies on grid flexibility and V2G potential in France
• Dreev: V2G aggregation platform operational in France - dreev.com
• ADVENIR: V2G subsidy program/fast chargers - advenir.mobi
• EU Commission: Clean Energy Package directives 2019/944 and 2019/941
• Enedis: Bidirectional metering documentation and grid services