Walmart Spent Billions on Warehouse Robots. Then Came the Dog Food.

Walmart is building one of the most automated supply chains in human history, robots handling the food that feeds millions, at nearly 200 warehouses across the United States. The small wheeled robots glide through fulfillment centers on motion sensors, sorting and stacking goods bound for grocery shelves and doorsteps. The investment runs into the billions. The vision is simple: faster shipments, fewer out-of-stocks, and eventually far fewer human warehouse workers.

Then came the frozen turkeys. And the jumbo bags of dog food. And a cardboard box that turned out to be an inch and a half too tall.

According to a Wall Street Journal report covered this week, Walmart's automation rollout is hitting a wall made of ordinary physics. The robots work beautifully on standard, predictable freight. The real world keeps sending them things that are heavy, floppy, irregular, or simply awkward, exactly the categories that make up a large share of what Americans actually buy.

The breakpack problem

Take "breakpack," one of the most common tasks in a grocery warehouse. Workers pull individual items out of bulk cardboard boxes so they can be shipped one at a time. For any of Walmart's more than 140,000 warehouse workers, it's trivial: grab, lift, toss. For the new robots, it's a genuine engineering challenge. The boxes are too big for the small machines to carry and unload, and the task requires exactly the kind of dexterous judgment that wheeled warehouse bots don't have.

The fix sounds simple: replace the boxes. And that is what Walmart is doing. But the company has used the same shipping boxes for more than two decades, urging workers to reuse them to save money. Each box costs about $1, and now they're being thrown away by the millions, swapped for new ones that are 1.5 inches shorter and must be taped closed, an extra step that costs extra money.

Philip McIlrath, who manages an Indiana apparel warehouse using the new boxes, called it "a small change," while acknowledging that for workers "it's changing their daily routine quite a bit." His argument: the new boxes will eventually reduce stocking time, which lowers labor costs. But the episode is revealing. A multibillion-dollar automation program is being reshaped, box by box, by an inch and a half of cardboard.

Heavy, floppy, and frozen

The turkeys are worse. A few years ago, workers at a newly automated grocery warehouse in California watched robotic arms fumble large frozen turkeys, just ahead of the Thanksgiving rush. Frozen turkeys are the automation nightmare: heavy, cold, slippery, oddly shaped, and seasonally concentrated in exactly the week when the system cannot afford to slow down. Walmart had to reroute shipments to nearby warehouses with more human workers to get birds to stores on time.

At the Brooksville, Florida warehouse, Walmart's automation test site, about 80% of inventory now moves through automated systems. The remaining 20% is the interesting part: heavy objects like large-screen TVs and jumbo bags of dog food that the robots still cannot manage. Those goods need human hands for the foreseeable future, which means the most physically demanding work, the giant TV, the 50-pound kibble bag, is precisely the work left to people.

The remaining 20% is the interesting part: the heavy, floppy, and frozen items are precisely the work left to people.

Peak complexity

Then there are the maintenance headaches. The bots, built by the Massachusetts robotics company Symbotic, in which Walmart owns a 12.6% stake, break down or need servicing frequently, sometimes from something as minor as dust buildup, according to the Journal's reporting. Symbotic says less than 10% of its product-moving robots were undergoing repairs at any given time last year, and that figure has since dropped to about 5%. Progress, but 5% of a very large fleet is still a lot of downtime.

Rob Montgomery, Walmart's head of US supply-chain operations, who is overseeing the automation of nearly 200 locations, told the Journal the company is "kind of in this peak complexity." It's an honest phrase. The systems are real, they're scaling, and they're straining at the seams simultaneously.

The costs are scaling too. Monthly electricity bills at Walmart's automated grocery facilities can reach $800,000 or more during peak heating or cooling months, compared with roughly $250,000 when operations were mostly manual, the Journal reported, citing a person familiar with the matter. The engineers needed to run the equipment cost more than the workers doing manual warehouse tasks did. Automation was supposed to cut the operating bill. Right now it's raising it.

Why Walmart isn't stopping

And yet the company is pushing forward. By August, more than 65% of Walmart's stores were receiving some automated freight, and over half of its e-commerce inventory was moving through automated systems. Executives expect spending on store remodeling and supply chain automation to peak this year and next, and the board considers the program a worthwhile long-term bet despite the difficulties.

The logic is straightforward: the snags are front-loaded and the payoff is permanent. Replacing every box in the network is a one-time trauma. Dust in the sensors is an engineering problem with an engineering solution. The 80% of Brooksville that already runs on automation isn't going back to manual, and every percentage point gained from here compounds across nearly 200 facilities.

"If we had waited for perfection, it would have taken too long," Montgomery told the Journal. It's a reasonable philosophy for one of the largest physical operations on the planet. Humans will still be needed, Walmart says, for tasks like unloading trailers and maintaining the robotic systems, and the company insists layoffs won't be necessary because warehouses have such high job turnover.

There's a lesson here that extends well beyond retail. The robotics industry has gotten very good at the structured middle of logistics: uniform boxes moving through predictable paths. What's left is the unstructured edges, the frozen turkey, the 50-pound bag, the cardboard box that's an inch and a half too tall. Those edges are where human bodies still win, and they're going to win there for a while. The future of food logistics is arriving one warehouse at a time, and it's being measured not in breakthroughs, but in inches.