V2G Technology: Vehicle-to-Grid Revenue Potential

# V2G Technology: Vehicle-to-Grid Revenue Potential

Vehicle-to-Grid (V2G) technology is transforming electric vehicles from passive loads into dynamic, revenue-generating energy assets. Instead of drawing power from the grid in one direction, V2G-enabled EVs can discharge electricity back into the grid, a building, or a home when demand and prices are high. For fleet operators, charging network owners, and large energy consumers, this bidirectional capability opens new revenue streams that improve the total cost of ownership for electric mobility infrastructure.

The business case for V2G rests on two facts. First, most passenger and light commercial vehicles sit parked more than ninety percent of the time, leaving their batteries underutilized. Second, electricity markets increasingly reward flexible resources that can absorb surplus renewable generation during low-price periods and inject power during peak-price events. V2G connects these two realities, allowing parked EVs to provide grid services, reduce demand charges, and supply backup power.

This article explains how V2G works, the communication standards that make it secure, the revenue models that make it profitable, and the regional pilots and markets that are proving its value. We also examine how FBK POWER's modular DC fast charging platform and all-in-one battery systems integrate with V2G-ready architectures to help operators capture these new revenue streams.

What Is V2G and How Does Bidirectional Power Work?

V2G, or Vehicle-to-Grid, is the capability of an electric vehicle battery to export stored energy back to the electrical grid or to a local load. Traditional charging is unidirectional: alternating current (AC) from the grid is converted to direct current (DC) inside the vehicle or charger and stored in the battery. V2G requires a bidirectional power converter that can reverse this flow, taking DC from the battery and converting it back to AC for the grid or building.

The Bidirectional Power Path

A V2G-capable system contains three main components:

1. Bidirectional On-Board Charger (BOBC): Located inside the vehicle, this unit converts AC grid power to DC for charging and inverts DC battery power to AC for export.
2. Bidirectional Off-Board Charger: In DC V2G architectures, the charger located outside the vehicle handles both rectification and inversion, communicating directly with the vehicle battery management system (BMS).
3. Energy Management System (EMS): Coordinates when the vehicle charges, when it discharges, and at what power level based on price signals, grid conditions, and user preferences.

Bidirectional power can follow several paths, each with its own label:

• V2G (Vehicle-to-Grid): Power flows from the EV battery to the utility grid.
• V2H (Vehicle-to-Home): Power flows from the EV to a residential panel, providing backup or peak shaving.
• V2B (Vehicle-to-Building): Power flows from a fleet or employee vehicle into a commercial building.
• V2L (Vehicle-to-Load): Power flows from the EV to a specific appliance or tool, typically through a standard outlet.

For commercial operators, V2G and V2B are the most economically attractive because they interact with utility tariffs, demand charges, and grid service programs.

DC vs AC V2G

V2G can be implemented through AC or DC coupling. AC V2G uses the vehicle's onboard bidirectional charger and is common in passenger cars such as the Nissan Leaf. DC V2G uses an external bidirectional DC fast charger and is better suited to fleet depots where multiple vehicles must discharge at high power. DC V2G also avoids the thermal and power limitations of small onboard chargers, making it the preferred path for heavy-duty and commercial applications.

ISO 15118 and the Communication Standards Behind V2G

Safe V2G operation is impossible without secure, standardized communication between the vehicle, the charger, and the grid operator. The leading standard for this communication is ISO 15118, which defines the digital handshake and message set for vehicle-to-infrastructure interaction.

ISO 15118-2: Plug & Charge and Basic V2G

ISO 15118-2 introduced two foundational capabilities:

• Plug & Charge: The vehicle and charger authenticate automatically using digital certificates, eliminating RFID cards or mobile apps.
• Basic smart charging messages: The vehicle can communicate its state of charge, charging preferences, and departure time to the charger or EMS.

ISO 15118-20: Bidirectional Power Transfer

The 2022 release of ISO 15118-20 added formal support for bidirectional energy transfer. It defines the messages required for the vehicle to announce discharge capability, negotiate discharge power limits, and receive price or control signals from an energy management system. ISO 15118-20 also improves cybersecurity through stronger certificate management and supports both AC and DC bidirectional charging.

For operators, ISO 15118-20 matters because it removes ambiguity. Without a unified standard, every vehicle and charger manufacturer could implement V2G differently, creating integration costs and stranded assets. With ISO 15118-20, chargers built to the standard can work with any compliant vehicle, simplifying procurement and scaling.

OCPP and Grid Communication

While ISO 15118 handles vehicle-to-charger communication, the Open Charge Point Protocol (OCPP) handles charger-to-backend communication. OCPP 2.0.1 includes extensions for smart charging, demand response, and device management that help operators participate in V2G programs. FBK POWER chargers support OCPP 1.6 today and can be upgraded to support the smart-charging extensions needed for V2G orchestration.

Revenue Models: How V2G Generates Returns

The revenue potential of V2G depends on local electricity market design, utility tariffs, and the type of vehicle fleet. The following table summarizes the primary revenue models available to V2G operators.

Frequency Regulation and Ancillary Services

Frequency regulation is one of the highest-value V2G services because grid operators need resources that can increase or decrease power output within seconds. EV batteries are ideal because they can ramp faster than traditional generators. In markets such as PJM in the United States and National Grid ESO in the United Kingdom, aggregators enroll fleets of V2G-capable vehicles and bid their combined capacity into regulation markets. The vehicles are paid for their availability and for the energy they deliver or absorb.

The key requirement is a reliable communication link. The EMS must receive an automatic generation control (AGC) signal from the grid operator and translate it into charge or discharge commands for each vehicle. Because these events are frequent but shallow, they typically have a minimal impact on battery degradation when managed correctly.

Peak Shaving and Demand Charge Reduction

For commercial and industrial sites, demand charges can represent thirty to fifty percent of the monthly electricity bill. V2G allows a fleet of vehicles to discharge during the site's peak demand window, reducing the recorded peak kilowatt (kW) value and therefore the demand charge. This is often called peak shaving or demand limiting.

Peak shaving is particularly attractive for fleet depots where multiple vehicles return to the site at the end of a shift. Rather than charging all vehicles immediately, the EMS can defer some charging until off-peak hours and use a subset of vehicles with high state of charge to support the building or the charging load. The all-in-one battery systems from FBK POWER can work alongside V2G-capable vehicles to extend peak-shaving capacity.

Energy Arbitrage with Time-of-Use Rates

In regions with time-of-use (TOU) electricity rates, V2G enables energy arbitrage. The operator charges vehicles when rates are low, typically overnight or during midday solar surplus, and discharges when rates are high, typically late afternoon and evening. The margin between low and high prices creates revenue.

Arbitrage requires accurate forecasting of driving needs. A vehicle must retain enough charge for its next trip, so the EMS uses departure schedules, historical driving patterns, and real-time battery state to set safe discharge limits. Fleet operators with predictable routes have an advantage because their energy requirements are easier to forecast.

Backup Power and Resilience

V2H and V2B provide backup power during grid outages. For a hospital, data center, or fleet depot, even a few hours of backup power from a fleet of EVs can avoid the cost of diesel generators, refrigerated cargo loss, or operational shutdown. Backup power is harder to monetize directly than regulation or peak shaving, but it can be valued through avoided outage costs and insurance premium reductions.

V2G Markets and Notable Pilots

V2G has moved from laboratory demonstration to commercial piloting in several markets. Understanding where these pilots are succeeding helps operators identify regions with mature market rules and strong incentives.

Denmark: Early Frequency Regulation Leadership

Denmark has been a global leader in V2G frequency regulation. In Danish pilots, aggregated EVs provided primary frequency reserve to Energinet, the national grid operator. The results demonstrated that a fleet of passenger EVs could respond to frequency deviations within seconds and that the revenue per vehicle was sufficient to offset charging infrastructure costs. Denmark's success relied on clear market rules that allowed small, aggregated resources to participate alongside large power plants.

The United Kingdom: Domestic V2G Trials

The UK government funded the world's largest domestic V2G trial, involving hundreds of households. The trial tested multiple charger and vehicle combinations, different tariff structures, and customer acceptance. Key findings included:

• Customers were willing to participate when they retained control over minimum battery levels.
• Time-of-use tariffs combined with V2G could reduce annual electricity costs by several hundred pounds.
• Standardization across manufacturers was the biggest barrier to scaling.

The UK experience shows that consumer trust and simple interfaces are as important as hardware capability.

California: Vehicle-Grid Integration Policy

California has advanced V2G through policy rather than technology alone. The California Public Utilities Commission has authorized V2G export compensation for customers with bidirectional EVs, and the state's Self-Generation Incentive Program (SGIP) provides incentives for energy storage, including V2G-capable vehicles in some configurations. California's high electricity rates and demand charges make peak shaving economically attractive for commercial fleets.

Japan: Disaster Resilience and V2H

Japan has emphasized V2H for disaster resilience. Following earthquakes and typhoons, households with V2H-capable vehicles can power essential appliances for days. This market driver is different from Europe's grid-services focus but equally important. Japanese automakers have led in developing V2H-compatible vehicles, and the domestic market now supports residential V2H as a mainstream product.

Fleet Operators: The Natural First Adopters

While V2G has residential potential, fleet operators are usually the first to achieve positive economics. The reasons are straightforward:

• Predictable schedules: Delivery vans, buses, and depot trucks return to a central location at known times, making it easy to plan charge and discharge cycles.
• Large aggregate capacity: A depot with fifty 100-kWh vehicles has 5 MWh of storage, enough to provide meaningful grid services.
• Direct utility relationships: Commercial sites often have interval meters and demand charges, giving V2G a clear value proposition.
• Professional maintenance: Fleets manage battery health centrally and can set conservative discharge limits that preserve warranty coverage.

Best Fleet Profiles for V2G

For logistics operators exploring depot electrification, FBK POWER provides specialized fleet solutions that combine high-power DC charging, energy storage, and V2G-ready control architecture.

Technical Challenges and Battery Considerations

V2G is not without challenges. The most frequently cited concern is battery degradation. Every charge and discharge cycle contributes to calendar and cycle aging, and V2G adds cycles that would not occur in normal driving. However, research from multiple universities and pilot programs has shown that when V2G is managed with shallow depth-of-discharge limits and thermal control, the incremental degradation is small and is typically outweighed by revenue.

Degradation Management Strategies

Effective V2G systems use the following strategies to protect batteries:

• State-of-charge windows: Discharging is limited to a narrow band, for example seventy to ninety percent state of charge, avoiding deep cycling.
• Thermal management: Keeping the battery within its optimal temperature range reduces aging. This is one reason liquid-cooled chargers and battery systems are preferred for high-duty V2G sites.
• Revenue-aware cycling: The EMS only dispatches the battery when the expected revenue exceeds the estimated degradation cost.
• Warranty tracking: Manufacturers and operators track equivalent full cycles to ensure V2G participation does not void vehicle warranties.

Grid Code and Interconnection

Connecting a V2G resource to the grid requires compliance with local interconnection standards. These standards specify safety disconnects, anti-islanding protection, power quality limits, and communication requirements. In North America, IEEE 1547 and UL 1741 are commonly referenced. In Europe, the requirements vary by country but generally align with the Network Codes. Operators should verify that their chargers and inverters are certified for grid-interactive operation.

FBK POWER products are designed to meet global certification requirements, including UL, CE, and grid-interconnection standards, reducing the compliance burden for V2G deployments.

V2G-Ready Infrastructure from FBK POWER

V2G cannot deliver value without a robust charging and control foundation. FBK POWER's product portfolio is engineered to support the high-duty cycles, communication standards, and environmental resilience that V2G deployments demand.

Our Split-Type DC Charging Cabinet features a modular architecture spanning 30 kW to 480 kW, an output voltage range of 200–1000 VDC, and full-load efficiency of at least ninety-five percent. The cabinet is rated for ambient temperatures from -25°C to +50°C and carries IP55/IK10 protection, making it suitable for outdoor fleet depots and highway corridors. With OCPP 1.6 support and a firmware roadmap toward OCPP 2.0.1, the platform can integrate with V2G aggregators and EMS platforms.

For sites that need energy storage alongside V2G, the All-in-One Battery System provides a scalable storage layer that can absorb renewable surplus, shave peaks, and extend backup duration. When combined with vehicle batteries, this creates a hybrid storage ecosystem that maximizes available capacity and revenue.

V2G Policy and Regulatory Landscape

Regulatory frameworks determine whether V2G can participate in electricity markets. In many jurisdictions, the rules were written for large power plants and do not easily accommodate distributed vehicle batteries. Three areas dominate the policy discussion.

Interconnection Standards

Grid operators require V2G resources to meet interconnection standards before they can export power. These standards cover anti-islanding, voltage and frequency ride-through, reactive power capability, and power quality. In the United States, IEEE 1547-2018 and UL 1741 SA define the requirements for distributed energy resources, including inverter-based systems. In Europe, the Network Codes and national implementation guidelines serve a similar purpose.

Meeting these standards often requires certified bidirectional inverters and communication gateways. Operators should confirm that their V2G charger or inverter has the appropriate certifications before committing to a revenue model that depends on grid export.

Market Participation Rules

V2G resources must also be allowed to participate in electricity markets. In some regions, only resources above a minimum size can bid directly. Smaller resources must aggregate through a third party. Aggregators combine hundreds or thousands of vehicles into a single resource that meets market size and telemetry requirements.

Examples of markets open to aggregated V2G include frequency regulation markets in PJM, CAISO demand response programs, and local flexibility markets in the Netherlands and Denmark. Each market has its own telemetry, response time, and settlement rules.

Net Metering and Export Compensation

For V2H and small-scale V2G, net metering or export compensation rules determine whether exporting power is economically attractive. Some utilities credit exports at the retail rate, while others pay only the wholesale rate or impose fixed fees. Understanding these rules is essential when modeling residential or commercial V2G returns.

FBK POWER monitors global regulatory developments and designs products to meet the certifications and grid codes required in major markets. Our standards page summarizes the protocols and certifications supported across our product range.

Modeling V2G Revenue: A Depot Example

A concrete example helps illustrate how V2G revenue adds up. Consider a delivery fleet depot with twenty electric vans, each with a seventy-kilowatt-hour battery. The depot has a 500 kW grid connection and operates under a utility tariff with high demand charges and time-of-use energy rates.

Site Assumptions

Revenue Streams

If the EMS dispatches an average of fifty kilowatts per vehicle for frequency regulation and peak shaving, the fleet can provide roughly one megawatt of aggregate capacity. At $40 per kilowatt-year for frequency regulation, this yields $40,000 annually. Peak shaving during the top twenty demand hours could reduce the recorded peak by 300 kW, saving $72,000 per year in demand charges. Energy arbitrage between off-peak and peak rates, assuming a conservative 200 MWh shifted annually, adds $40,000 in energy cost savings.

Combined, the annual value approaches $150,000 before accounting for incremental battery degradation and aggregator fees. Even after fees and conservative degradation assumptions, the net annual benefit can exceed $80,000, significantly improving the total cost of ownership of the fleet.

Sensitivity Factors

Revenue is sensitive to several factors:

• Market depth: Frequency regulation prices vary by region and season.
• Vehicle availability: Vehicles must be plugged in during the hours when services are needed.
• State-of-charge headroom: V2G cannot discharge vehicles below their next-trip requirement.
• Aggregator fees: Typically range from twenty to forty percent of gross revenue.
• Battery degradation: Must be modeled and monetized accurately.

This example shows why fleet operators are the natural early adopters of V2G. Predictable schedules and centralized management make it possible to capture multiple revenue streams simultaneously.

V2G and the Future of Fleet Electrification

Fleet electrification and V2G are converging. As governments tighten emissions rules and fuel costs rise, fleet operators are replacing internal-combustion vehicles with electric alternatives. Each electric vehicle added to a depot increases the available battery capacity and the potential value of V2G services.

Why Fleets Are Ideal for V2G

Fleet vehicles have characteristics that residential vehicles lack:

• Centralized ownership: A single operator controls dozens or hundreds of vehicles.
• Predictable utilization: Routes, dwell times, and energy needs are known in advance.
• Professional maintenance: Battery health and warranty compliance are managed centrally.
• Large scale: Aggregate capacity is sufficient to participate in wholesale markets.
• Direct grid connection: Commercial sites already have interval metering and utility relationships.

These characteristics allow fleet operators to capture V2G value with lower transaction costs and less behavioral uncertainty than residential programs.

The Role of Charging Infrastructure

V2G-ready fleets need chargers that can handle bidirectional power and communicate securely with the EMS. DC fast chargers are preferred because they bypass the vehicle's onboard charger and can discharge at higher power. The Split-Type DC Charging Cabinet from FBK POWER provides the power range and communication interfaces needed for fleet V2G deployments.

Preparing for a V2G-Ready Fleet

Operators planning fleet electrification should consider V2G from the beginning. Retrofitting a depot with bidirectional chargers and interconnection equipment is more expensive than including them in the initial design. Key preparatory steps include:

• Confirming that selected vehicles support bidirectional charging.
• Sizing the grid connection and transformer for both charging and export.
• Selecting chargers and inverters certified for grid-interactive operation.
• Choosing an EMS or aggregator platform that supports local market rules.
• Establishing maintenance procedures that preserve IP ratings and cooling performance.

Action Plan for a V2G Pilot

For operators considering their first V2G deployment, a structured pilot reduces risk and builds internal expertise.

Phase 1: Feasibility Assessment

Evaluate the technical and economic potential of V2G for your fleet. Review utility tariffs, local market rules, vehicle capabilities, and existing charging infrastructure. Estimate annual revenue from frequency regulation, peak shaving, and energy arbitrage. Identify regulatory barriers and required certifications.

Phase 2: Technology Selection

Select bidirectional chargers, an EMS or aggregator, and vehicles that support the chosen V2G architecture. Verify interoperability between components and confirm compliance with ISO 15118-20 or CHAdeMO protocols as applicable. FBK POWER can support technology selection through its standards and certifications documentation.

Phase 3: Deployment and Commissioning

Install the hardware, configure communications, and commission the system with the utility or market operator. Conduct functional tests for bidirectional power, safety disconnects, and telemetry. Train operations staff on the EMS interface and emergency procedures.

Phase 4: Operation and Optimization

Run the system for at least six months to collect performance data. Compare actual revenue and savings to the feasibility model. Refine dispatch strategies, state-of-charge limits, and maintenance schedules. Use the results to build the business case for expanding V2G across the fleet.

The Future Outlook for V2G

Several trends will accelerate V2G adoption over the next decade. Battery costs continue to decline, making the incremental cost of bidirectional hardware easier to justify. ISO 15118-20 is being adopted by major automakers, creating a common language for V2G. Electricity markets are becoming more granular, with real-time pricing and local flexibility markets that reward distributed resources. Finally, fleet electrification is expanding rapidly, increasing the number of vehicles available for grid services.

Regulators also play a role. As more jurisdictions recognize V2G as a form of energy storage, they are updating interconnection rules, tariff structures, and incentive programs. Operators who install V2G-ready infrastructure today will be positioned to capture these benefits as markets mature.

V2G and Battery Second Life

V2G is closely related to the second-life battery market. When an EV battery reaches the end of its useful life in a vehicle, it often retains seventy to eighty percent of its original capacity. These batteries can be repurposed into stationary energy storage systems and then managed by the same EMS that coordinates V2G resources.

The combination of V2G and second-life storage creates a layered energy ecosystem. Vehicle batteries provide short-term flexibility while vehicles are plugged in. Stationary second-life batteries provide longer-duration storage and deeper peak shaving. Together, they reduce the need for new battery production and extend the value extracted from each kilowatt-hour of capacity.

FBK POWER's All-in-One Battery System can integrate both new and second-life cells, giving operators a flexible storage platform that complements V2G-capable vehicles.

V2G Glossary for Fleet Managers

The following terms appear frequently in V2G discussions:

• Bidirectional charger: A charger that can both charge and discharge a vehicle battery.
• Aggregator: A company that combines many small V2G resources into a single market participant.
• Frequency regulation: A grid service that adjusts power output to maintain grid frequency.
• Peak shaving: Reducing the maximum power drawn from the grid during high-demand periods.
• Energy arbitrage: Buying energy at low prices and selling or using it at high prices.
• Depth of discharge: The percentage of battery capacity used during a cycle.
• Anti-islanding: Protection that prevents a resource from energizing the grid during an outage.

Understanding this vocabulary helps fleet managers evaluate V2G proposals and communicate effectively with technology vendors and utilities.

Conclusion: Turn Your Fleet into a Grid Asset

Vehicle-to-Grid technology turns the traditional EV charging model upside down. Instead of treating vehicles as pure loads, V2G treats them as mobile batteries that can earn revenue, reduce costs, and improve grid stability. The strongest near-term opportunities lie in fleet depots, where predictable schedules, large battery capacities, and direct utility relationships create clear economics.

Success requires more than bidirectional vehicles. It requires chargers, energy management systems, and communication standards that work together securely and at scale. FBK POWER provides the charging infrastructure and energy storage platforms that operators need to build V2G-ready sites.

Ready to explore how V2G can generate revenue from your fleet? Contact our engineering team for a site assessment, or request a custom quote for a V2G-ready charging and storage solution.

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This article was researched using [IEEE 2030.5 Smart Energy Profile 2.0](https://standards.ieee.org/standard/2030.5-2018.html), [ISO 15118 Vehicle-to-Grid Communication](https://www.iso.org/standard/77816.html), and [U.S. Department of Energy V2G Research](https://www.energy.gov/eere/vehicles/vehicle-grid-integration). V2G revenue data references [NREL Vehicle-Grid Integration Research](https://www.nrel.gov/transportation/vehicle-grid-integration.html) and [IEA Energy Storage Report](https://www.iea.org/reports/global-ev-outlook-2026).