Electric vehicle owners could earn thousands by supporting power grid

Electric vehicle (EV) owners could potentially earn thousands of dollars annually by using their cars as mobile energy storage units to support power grids, according to a pilot project in Delaware. The study demonstrated that EVs, which are idle and plugged in about 95 percent of the time, can store excess renewable energy during periods of low demand and feed it back to the grid during peak times. This vehicle-to-grid (V2G) technology could provide grid storage at roughly one-tenth the cost of building dedicated battery farms, offering a cost-effective way to balance fluctuating renewable energy supplies from solar and wind sources. The Delaware project involved four Ford electric vehicles equipped with V2G charging capabilities, monitored throughout 2025. Results indicated that each EV could have earned up to $3,359 annually by selling stored electricity at market prices, while simultaneously helping to stabilize the grid. Willett Kempton, who led the study and has researched V2G since 1997, emphasized that widespread adoption of this technology could enhance grid reliability and accelerate the integration of renewable energy. Despite its promise, V2G remains largely experimental, with only limited pilot programs operating globally in the US, Europe, Japan, and China. One of the main challenges hindering broader implementation is the technical complexity of reversing energy flow from the vehicle back to the grid. Power grids operate on alternating current (AC), while EVs use direct current (DC) internally, necessitating safe and efficient conversion equipment. Developing V2G systems requires collaboration among automakers, utility companies, and regulators to establish safety standards and infrastructure. Currently, the simplest V2G setups involve wall chargers capable of converting DC to AC, but scaling this technology demands overcoming regulatory and engineering hurdles. The potential benefits of V2G technology extend beyond individual EV owners’ earnings. By leveraging the existing fleet of electric vehicles as distributed energy resources, power systems could reduce reliance on costly stationary batteries and fossil fuel peaker plants. This innovation could play a crucial role in managing the variability of renewable energy, supporting decarbonization goals, and fostering a more resilient and sustainable electricity grid.