Vehicle-to-grid technology, or V2G, enables electric vehicles to function as mobile energy storage units by returning power to the electrical grid during periods of high demand. A consortium including Eversource, National Grid, EnergyHub, Sunrun, and the Mobility House has initiated a pilot project in Massachusetts, integrating participants into an existing program called ConnectedSolutions. Participating EV owners receive compensation when their vehicles provide power during demand response events, typically occurring only a small number of hours annually rather than on a daily basis.
Utilities are increasingly interested in V2G technology as they confront multiple simultaneous challenges. Electricity demand continues to rise due to data centers and the transition from combustion vehicles to electric models and from gas furnaces to heat pumps. Simultaneously, utilities are shifting away from fossil fuels toward intermittent renewable sources like wind and solar, which require energy storage solutions. While utilities typically address this through battery facilities and transmission line infrastructure, these investments substantially increase costs passed on to customers.
V2G technology offers a potentially cost-effective alternative by leveraging existing EV batteries as flexible energy storage. A typical EV battery contains approximately six times the capacity of a residential backup unit, and vehicles with predictable schedules such as school buses and municipal fleets represent particularly valuable resources. Only a fraction of EV owners need to participate for the system to effectively support the grid, though broader participation increases utility flexibility and reduces reliance on individual batteries.
Coordination mechanisms are being refined through early projects, including applications that allow owners to specify typical vehicle usage patterns. The system is designed to send power back during peak demand periods, such as early evening when people return home, with vehicles recharging during later hours. This approach integrates with active managed charging techniques that stagger charging times throughout the evening and morning, preventing simultaneous demand spikes. As hardware costs decline and standards mature, V2G technology is expected to become increasingly accessible.
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