V2G: How electric vehicles can power the grid and change everything with 2027 regulations

Discover how V2G feeds energy back into the grid, the benefits, standards, and challenges on the path to large-scale adoption.

V2G transforms electric vehicles into mobile batteries connected to the grid, capable of feeding energy back when demand increases. With the right infrastructure and regulations, this feature can increase system reliability and facilitate the integration of more renewables.

What is V2G?

V2G, or vehicle-to-grid, allows electric vehicles to act as dynamic energy storage and distribution units that can send power back to the grid as needed, through a charger capable of operating in both directions.

How bidirectional charging works

Real-time communication between the grid and the vehicle is essential to coordinate when the car should discharge into the grid or recharge, depending on demand conditions.

Energy management systems and smart grids work together to predict demand and ensure there is enough power on the grid without leaving the vehicle without a charge. If there is excess energy, the vehicle can recharge at an opportune time.

Benefits and applications

• Grid stability during peak demand and outages.
• Better integration of renewables by avoiding energy bottlenecks.
• Less need for large stationary batteries, with more flexible storage.
• Reduced dependence on expensive peaker plants, helping to keep prices stable.
• Provides more resilient power for businesses and fleets during power outages.
• Potential to reduce the Total Cost of Ownership (TCO) of fleets.
• For manufacturers, it adds value to vehicles with V2G capability.
• Fleets can generate revenue by synchronizing batteries for utilities.
• Residential customers can sell excess energy to the grid and reduce bills.

V2G, V2X and other applications

Beyond V2G, the V2X set encompasses paths like V2B (vehicle-to-building), V2I (vehicle-to-infrastructure), and V2P (vehicle-to-pedestrian). While V2G focuses on the energy returning to the grid, the other areas deal with local applications and data communication between vehicles and their surroundings.

Challenges and the future

• Energy management software still needs to evolve to support large-scale real-time trades.
• Adoption depends on the maturation of standards like ISO 15118 and CCS2/CHAdeMO technologies.
• The European Union is moving forward with AFIR, which from January 2027 will require bidirectional communication at all charging stations, accelerating the V2G ecosystem.

Standard connections and compatibility

Almost all V2G solutions depend on compatible cars and chargers that manage energy conversion. Today, many systems use CHAdeMO, but there is a move towards CCS2 with ISO 15118 to expand compatibility between vehicles and chargers.

Conclusion

As infrastructure matures, V2G can bring greater reliability to the grid, reduce costs for businesses and families, and turn electric vehicles into valuable energy assets.

What do you think: would you be willing to allow your vehicle to power the grid during times of high demand or outages? Leave a comment below with your opinion and possible uses in your region.