GM Closing Brownstown Battery Assembly Plant Near Detroit as Lease Ends

What it means for GM's battery footprint

Brownstown is a pack-assembly site, not a cell plant, so the closure removes no cell capacity. Neither TechCrunch nor Notebookcheck gave a capacity figure in GWh or an annual pack count for the plant, so its output cannot be compared with GM's cell factories. Headcount had already shrunk to fewer than a dozen, according to Notebookcheck.

The timing sits against a weaker US EV market. Notebookcheck reports that battery-electric sales fell after the $7,500 federal purchase incentive ended in September 2025, that GM has booked $10.9 billion in EV-related charges since the second quarter of 2025, and that planned Chevrolet Bolt output has been cut to about 35,000 units from an original target of about 150,000. TechCrunch notes that the repeal of federal EV production and sales incentives hit automakers' electrification plans.

GM is still investing in cell technology. TechCrunch says it continues to research lithium-manganese-rich and sodium-ion chemistries and is rolling out a new $900 million facility to speed their commercialization. Voltgrid News reported earlier on Peak Energy's sodium-ion Series B led by GM Ventures.

What is not confirmed yet

GM has not named the plants that will take over Celestiq and E-Ray pack assembly, the exact closing date, or how many of the remaining workers will transfer. The Automotive News original is paywalled, and Voltgrid has not read it directly. Outlets differ on whether the closure reflects GM's EV pullback; GM's stated reason is the lease.