General Motors has idled its Factory Zero electric-vehicle plant, temporarily laying off 1,300 workers at the Detroit-Hamtramck facility.

The plant, retooled from its former Detroit-Hamtramck Assembly role with a $2.2 billion investment announced in 2020, builds the GMC Hummer EV pickup and SUV, the Chevrolet Silverado EV and the Cruise Origin. GM has not publicly detailed how long the layoff will last or which production lines are affected.

The idling puts hard numbers on what GM executives have signaled for months: EV demand is growing more slowly than the company's most aggressive forecasts. GM said in October it would slow some EV-related spending, and CEO Mary Barra has repeatedly framed the company's capital discipline around matching capacity to real orders rather than pushing volume.

For the 1,300 affected workers, the word "temporary" carries weight. Temporary layoffs in US auto manufacturing have historically stretched from a few weeks to several months depending on inventory levels and order rates. Workers typically draw state unemployment benefits plus supplemental unemployment benefits under their UAW contract, but the income gap and schedule uncertainty bite regardless.

What this means for the plant

Factory Zero sits at the center of GM's Ultium-based truck strategy. It is the lead plant for the Hummer EV and Silverado EV, both low-volume, high-price entries so far. Slower ramp of those programs translates directly into plant hours, and 1,300 laid-off workers is a significant share of the site's workforce — the plant employs roughly 2,300 to 2,600 people at full staffing levels, meaning the layoff touches about half the roster.

GM has faced this pattern before at the site. The plant took extended downtime in 2024, and Hummer EV production has run well below the volumes GM once projected for it. The current idling continues that adjustment rather than marking a sudden break.

The demand question

The action also fits a broader industry correction. Ford has cut shifts at its Dearborn EV plant and retooled toward other products. Multiple OEMs have pushed back EV capacity targets as US EV adoption settles at a slower growth rate than the 2021-2022 planning assumptions suggested. Supplier programs tied to EV volume ramps — battery cell offtakes above all — will feel any extended downtime at Factory Zero, since Ultium cell output is calibrated to vehicle assembly schedules.

GM has committed publicly to keeping its EV portfolio intact, and Barra has said the company remains confident its EVs will reach mid-single-digit profit margins in time. An idled plant does not contradict that stance, but it does show how much slack exists between installed capacity and current orders.

What to watch

The next concrete signal is the plant's return-to-work date, which GM must file with the state of Michigan under WARN-adjacent notice procedures for layoffs of this length. Watch also for GM's next quarterly earnings call, where management will face questions on whether the Factory Zero downtime changes its full-year EV production guidance. The third indicator is the Silverado EV order book: if fleet and retail orders firm up, the plant's utilization — and the 1,300 jobs tied to it — recover quickly. If not, "temporary" gets tested.