GM's Ohio Battery Plant Has Been Dark Since January. Nobody Can Say When the Lights Come Back On.

Most EV supply chain stories in 2026 have been about tariffs, Chinese competition, or faltering demand. The Ultium Cells situation in Warren, Ohio is all three at once, and it tells a broader story about what happens when industrial policy collapses mid-build.

GM and its joint-venture partner LG Energy Solution idled the Warren, Ohio battery facility in January for six months in response to weak demand for electric vehicles. Around 850 workers have been out of work since January, with approximately 480 laid off indefinitely. This week, news of a partial restart arrived. Ultium said a "small number" of workers would return the week of May 25 for work "related to resuming operations later this year," with the timing for broader production resumption dependent on EV market demand. No specific date was given. No confirmed schedule exists. 

The immediate cause is straightforward. GM and other automakers pulled back on EV manufacturing following the expiration of a $7,500 federal tax credit in late September. While automakers continue to build and sell EVs, they have lowered factory output to match Americans' appetite for electric vehicles. 

Why this is not just a GM story

The Warren plant's situation is the most visible symptom of a much wider US battery manufacturing retreat. Stellantis paused construction on its Kokomo, Indiana StarPlus Energy joint venture with Samsung SDI. Ford delayed full-rate production at its BlueOval SK Battery Park in Kentucky. Honda and LG Energy Solution slowed timelines at their Jeffersonville, Ohio joint venture. The federal Inflation Reduction Act created a buildout premised on sustained incentives. When those incentives were removed, the demand signal that justified the capital investment reversed simultaneously across the industry. 

GM has also sold its stake in a Michigan battery facility to LG, which now supplies that plant's output to Tesla for grid-scale Megapacks under a $4.3 billion contract, and wrote off more than $7.6 billion in EV-related costs during 2025. The Ultium brand itself was retired in late 2024, with GM moving to a multi-chemistry approach and a new cell development partnership with Samsung SDI. 

The pivot toward energy storage rather than EV batteries is the more durable signal. Ultium sunk $70 million into retooling its Spring Hill, Tennessee facility to make energy storage batteries using a lithium-iron-phosphate formula, retraining furloughed workers to support the growing AI data centre industry rather than EV production. The production shift marks Ultium's first major retooling and reflects its evolution as a diversified battery cell manufacturer. 

The exposure for European and Asian companies

For non-US battery manufacturers, the Ohio situation is a useful mirror. The investments made under the Inflation Reduction Act were premised on a sustained incentive environment. Stripped of that foundation, battery makers have faced a choice between absorbing losses, pivoting to adjacent markets, or conceding ground to competitors whose governments have maintained a more consistent long-term position. 

For European automotive and industrial companies sourcing battery cells or EV components through North American supply chains, the uncertainty at Warren is a live data point in supplier qualification risk. A battery plant that cannot confirm its own restart timeline is not a reliable source of supply for production schedules that need certainty six to twelve months out.

The disruption does not arrive as a part shortage. It arrives as a supplier that cannot tell you when it will be back at capacity, and a market whose incentive structure changed faster than anyone's capital investment could adapt.