GM Wants Your Parked EV to Earn Money - But the Price Tag Is Steep

Most electric vehicles spend their nights parked and silent, plugged into chargers while their owners sleep. General Motors sees that as a wasted resource. The automaker is now pushing a plan to turn its fleet of Chevy, Cadillac, and GMC EVs into backup batteries for the nation’s power grids.

The idea is simple: let EVs send electricity back to utilities during peak demand. The execution, however, comes with a hefty price.

In a recent open letter to utility companies and policymakers, GM Energy vice president Wade Sheffer argued that the technology is already on the road. , storing enough combined energy to power roughly 120,000 homes for a week, according to the company. “The technology is already parked outside,” Sheffer wrote.

Bidirectional charging isn’t new. It’s been marketed as a way to keep homes running during blackouts. GM wants to scale that concept to support entire local grids, potentially creating a new income stream for owners. But there’s a catch. To actually participate, drivers need specialized charging hardware that, according to a report from Wired, costs about $20,000 before installation.

At that price, GM acknowledges it could take up to five years for an owner to break even—a timeline that raises questions about the upfront value.

Other obstacles remain. Utility regulations vary widely by state and region, so widespread adoption will require coordination with hundreds of separate organizations. GM is already working with Pacific Gas and Electric in California and DTE Energy in Michigan, but scaling nationwide is a different challenge.

And for many EV owners, the biggest concern is battery wear. Regularly cycling a car’s battery to support the grid could shorten its lifespan, a topic GM did not address in detail.

For now, GM’s vision is more aspiration than reality. But with extreme weather and rising energy demand straining power systems, the idea of parked EVs earning their keep may eventually gain traction—once the math works for the people who own them.