Vehicle-to-grid electric school buses shore up the US grid in a heat wave
WRI data shows fully deployed vehicle-to-grid projects using about 230 electric school buses can return 8 MWh to the US grid and ease peak demand.
Photo by PonerMas s on Pexels
Vehicle-to-grid school buses returned stored power to strained US electricity grids during last week’s heat, according to a July 5, 2026 Electrek report drawing on data from the World Resources Institute (WRI) Electric School Bus Initiative. WRI reports that fully deployed vehicle-to-grid (V2G) projects covering about 230 electric school buses can now supply 8 megawatt-hours (MWh) of power back to the grid at any moment. That is enough to power roughly 1,600 typical US homes for up to four hours and to trim peak demand for the utilities involved.
The figures matter because school buses sit idle in summer, exactly when air-conditioning drives electricity demand to seasonal highs. Their large batteries are available when the grid is most stressed, turning a parked fleet into distributed storage.
How vehicle-to-grid school buses support the grid
V2G lets a bus battery both charge from the grid and discharge back to it. When demand climbs, utilities and fleet operators can draw stored energy from connected buses instead of firing up extra generation. WRI puts the current instantaneous capacity of fully deployed projects at 8 MWh across about 230 buses.
The confirmed figures are set out below.
| Metric | Figure |
|---|---|
| Electric school buses in deployed V2G projects | About 230 |
| Power available to the grid at any moment | 8 MWh |
| Homes powered | About 1,600 US homes for up to 4 hours |
| Oakland Unified School District fleet | 74 buses |
| Oakland annual contribution to the grid | About 2.1 GWh per year |
| Total US school bus fleet | About 480,000 |
| WRI Electric School Bus Initiative goal | Electrify the US fleet by 2030 |
Source: Electrek (July 5, 2026); WRI Electric School Bus Initiative.
California and Oakland lead US V2G
California leads the United States in developing and adopting V2G school bus technology. WRI identifies the Oakland Unified School District as the state’s largest project, with a fleet of 74 buses that adds an estimated 2.1 gigawatt-hours (GWh) of energy back to California’s grid each year, managed through fleet operator Zum. The scale remains early: about 230 buses run fully deployed V2G against a national fleet of roughly 480,000 school buses.
The approach treats parked buses as grid assets, close in principle to microgrids for reliable, localized energy. It also speaks to a common concern about clean power, namely whether renewable energy is unreliable due to intermittency; flexible storage from fleets is one answer to peak-demand stress. The buses themselves are part of the wider shift to electric vehicles.
About the WRI Electric School Bus Initiative
The World Resources Institute is a global research organisation working on climate, energy, food, water and cities. It established the Electric School Bus Initiative in late 2020 with the goal of electrifying the entire US fleet of about 480,000 school buses by 2030. The initiative is backed by a $100 million gift from the Bezos Earth Fund over five years, shared with other WRI climate work. From the start of 2021 to August 2024, the number of electric school buses on US roads or committed grew nearly tenfold. The initiative tracks deployments, advises districts, and documents vehicle-to-grid programmes. Its latest data, cited during last week’s heat, shows how a small but growing set of V2G buses can already return measurable power to the grid at peak demand.
Sources: Electrek; World Resources Institute; CleanTechnica
Featured image: photo by PonerMas s on Pexels (free Pexels license).
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I specialize in sustainability education, curriculum co-creation, and early-stage project strategy. At WINSS, I craft articles on sustainability, transformative AI, and related topics. When I’m not writing, you’ll find me chasing the perfect sushi roll, exploring cities around the globe, or unwinding with my dog Puffy — the world’s most loyal sidekick.
