The impact of electric mobility goes far beyond electric cars themselves. One of the most promising technologies in this field is V2G (Vehicle-to-Grid), a system that transforms electric vehicles into more than just a means of transport. It turns them into energy storage units capable of interacting with the electricity grid.
Due to its growing importance, in this article we explain what V2G is, how it works, its advantages, which vehicles already support it and what alternatives exist within the same technological category.
What Is V2G?
The term V2G, which stands for Vehicle-to-Grid, refers to a technology that allows electric vehicles not only to charge from the grid but also to return electricity when required.
In simple terms, an electric car equipped with V2G can charge its battery like any other electric vehicle. However, it can also send part of that stored energy back to the grid during periods of high electricity demand.
This means that your vehicle can help stabilise the grid, store surplus renewable energy and reduce electricity costs for users. When discussing Vehicle-to-Grid technology, we are referring to a new energy model in which electric mobility becomes a key part of the transition towards a more flexible and sustainable energy system.
How Does Vehicle-to-Grid Work?
V2G technology is based on bidirectional charging and intelligent communication between the electric vehicle, the charging station and the electricity grid. Let us examine its main operating phases.
1. Bidirectional Charging
Unlike traditional chargers, which are unidirectional, V2G systems use bidirectional chargers. These allow electricity to flow both into and out of the vehicle battery.
Energy can move in either direction depending on the needs of the user and the electricity grid.
2. Energy Storage and Discharge
When electricity demand is low, the electric vehicle charges as normal. During periods of high demand, usually peak hours, the vehicle can release part of its stored energy back into the grid.
This transforms thousands of electric vehicles into distributed battery systems that help balance electricity supply and demand.
Benefits for the Grid and for Users
V2G technology offers clear advantages for both electricity networks and electric vehicle owners.
Benefits for the electricity grid include:
- Improved grid stability and frequency control
- Support during peak demand periods
- Better integration and storage of renewable energy
Benefits for users include:
- Financial incentives for supplying electricity back to the grid
- Reduced electricity bills
- Participation in a more sustainable energy system
Advantages of V2G Technology
V2G technology offers several major benefits, which explains why governments, energy companies and vehicle manufacturers are investing heavily in its development.
- Improved Energy Efficiency. V2G allows stored energy in electric vehicle batteries to be used more effectively rather than remaining unused while vehicles are parked.
- Increased Grid Flexibility. Each electric vehicle becomes an energy resource capable of supporting grid stability in real time.
- Cost Savings. Vehicle owners can reduce energy costs by selling stored electricity back to the grid. At the same time, electricity providers can avoid using expensive backup energy sources during peak demand periods.
- Support for Renewable Energy. V2G systems allow surplus solar or wind energy to be stored in vehicle batteries and used when renewable generation is lower.
- Greater Sustainability. By improving energy efficiency and supporting renewable integration, V2G contributes to reducing CO2 emissions and promoting a decentralised energy system.
Which Cars Support V2G?
Although not all electric vehicles currently include V2G technology, several manufacturers have already introduced compatible models, and more are expected in the near future.
Some of the most notable V2G capable or prepared vehicles include:
- Nissan Leaf, one of the pioneers and most recognised models in V2G development
- Mitsubishi Outlander PHEV, one of the first plug in hybrid vehicles with real V2G functionality
- Kia EV6, with partial support depending on infrastructure availability
- Hyundai IONIQ 5 and IONIQ 6, compatible with the ISO 15118 communication standard
- Ford F-150 Lightning, capable of powering an entire home during a power outage
- Volkswagen ID.3 and ID.4, which include hardware prepared for bidirectional charging
- BMW i3, one of the early urban electric vehicles involved in pilot V2G programmes
- Honda e, currently used in pilot V2G projects in some European markets
- Renault Zoe and Renault Megane E-Tech, both involved in multiple European V2G pilot initiatives
- Tesla Model S, Model 3, Model Y and Model X. Tesla vehicles are technically capable of bidirectional charging, although the functionality has not yet been fully enabled through software
- BYD Atto 3 and Han EV, with support for V2X technology that includes V2G compatibility
As international standards become more established, it is expected that many manufacturers will include V2G capability as a standard feature in future electric vehicle models.
Alternatives to Vehicle-to-Grid Technology
Bidirectional energy technology is not limited to V2G. Several related systems explore different ways of using energy stored in electric vehicles.
- V2H (Vehicle-to-Home). This system allows an electric vehicle to supply electricity directly to a home. It is particularly useful during power outages or for smart self consumption.
- V2L (Vehicle-to-Load). V2L allows vehicles to power electrical appliances or devices connected directly to the car.
- V2V (Vehicle-to-Vehicle). This technology enables energy transfer between two electric vehicles, which can be useful in roadside assistance situations.
- V2D (Vehicle-to-Device). Designed for charging small electronic devices such as laptops or mobile phones directly from the vehicle battery.
- V2X (Vehicle-to-Everything). V2X is a broader concept that includes all possible interactions between vehicles and external systems, devices and energy networks.
V2G technology represents a major step forward in the integration of electric mobility and smart energy management. By allowing electric vehicles to store and return electricity, it improves grid stability, supports renewable energy and creates new economic opportunities for users.
Although the technology is still developing, it is expected to play a key role in the future of sustainable energy and intelligent transport systems.
