General Motors is rolling out a software update that will let some U.S. owners of its Ultium-platform electric vehicles sell electricity from their parked cars back to the power grid, turning idle batteries into a potential revenue stream and local grid resource. The move builds on GM Energy’s vehicle-to-home offerings and is one of the clearest attempts yet to treat cars as distributed energy assets. Automakers and utilities have been piloting similar ideas for years, and GM says a broader consumer-facing push is on the way.
As reported by Reuters, the new capability will arrive via a software update and will let eligible owners feed power to utilities under participating programs. Reuters notes that a commercial rollout is likely in the next few months, starting in California and Texas as GM negotiates programs with roughly 10 utilities. GM is already running a pilot with DTE Energy in Michigan that involves about 30 GM employees, and the company would keep a cut of payments when owners sell electricity back.
How the system works
GM's bidirectional setup centers on its PowerShift bidirectional charger, along with an enablement kit and an energy-management system that can move electricity from car to home or grid. The company says drivers will need a compatible Ultium EV, an installed bidirectional charger, the enablement kit and proper interconnection with their local utility. GM's customer literature walks through safety rules, equipment needs and how home-backup service differs from grid services, according to GM.
Utilities and regulators remain cautious
Utilities and regulators are still treading carefully with vehicle-to-grid programs, since grid value, rates and interconnection rules change from one service territory to another and pilots remain selective, according to Microgrid Knowledge. GM is testing programs with PG&E, Southern California Edison and DTE, while state regulators such as the California Public Utilities Commission hold forums to hash out valuation methods and rate design. That patchwork of pilots and experimental tariffs means availability will hinge on where an owner lives and what their utility is willing to offer.
What owners could earn - and what it costs
Owners who join a vehicle-to-grid program could earn payments for exported electricity or trim their bills by discharging during high-price periods, but compensation and eligibility will depend on the specific utility and program. GM has suggested it may share savings or apply credits toward leases, although it has not laid out a universal payout scheme. The hardware itself - a bidirectional charger, an enablement kit and in some cases, stationary storage - can add several thousand dollars to up-front costs, according to reporting from The Drive. Industry experts also point to open questions about battery degradation and program rules, and researchers and automakers are still studying how frequent charge and discharge cycles affect long-term battery health, per MotorTrend.
What to expect next
GM says it will initially target markets where time-of-use pricing, outage-related incentives and pilot funding make the economics easiest, then broaden its reach as utilities and regulators develop clearer rules. Reuters reports that the first commercial push will focus on California and Texas, and notes that wider access will depend on which programs utilities roll out and whether aggregators and utilities can make the numbers work for both owners and grid operators. For now, the software update makes EVs a more visible piece of the energy transition, while the ultimate winners will be determined by local program design and rate structures.
