Interest in dark factories has spiked recently, fueled by AI advances, persistent labor shortages, and the automation lead held by China and Japan. This article breaks down what dark factories actually are, whether they truly exist, and what it means for US manufacturers weighing their next automation move. We'll explore this through the lens of GLOBAL Automation Technologies, which has spent 18+ years integrating robotic systems into automotive, aerospace, and heavy-equipment production lines.
Key Takeaways
- Dark factories run on robotics, AI, and automated controls with little or no on-site staff
- True 100% lights-out plants remain rare, even in Japan and China; most are lights-sparse hybrids
- No US factory runs fully dark; Tesla's Shanghai plant reportedly hits 95% automation in select processes
- FANUC, Philips, and Xiaomi are the most-cited real-world lights-out examples worldwide
- US manufacturers can gain lights-out benefits today through targeted cells like machine tending, without a full dark factory
What Is an Automated, Dark or Lights-Out Factory?
Siemens defines a lights-out factory (also called a "dark factory") as a facility with such minimal human activity that it can run in darkness with zero human intervention onsite. Remote monitoring is still allowed. Someone might get an alert on their phone at midnight — they just aren't standing on the floor.
That's different from "fully automated," which simply means a process or line requires little human involvement. A factory can be fully automated in one department and staffed everywhere else.
Lights-Out vs. Lights-Sparse
Most real-world facilities fall into a category Siemens calls lights-sparse: unattended operation limited to specific cells, shifts, or product lines rather than the entire plant. This is the practical reality for manufacturers dealing with variable products or complex assemblies.
The technology stack that makes any of this possible includes:
- Industrial robots for physical tasks
- AI/machine learning for decision-making and quality control
- Machine vision for inspection and guidance
- Digital twins for simulation before deployment
- MOM/MES software for production orchestration
- IIoT sensors for real-time monitoring
That stack is new. The goal isn't. IBM built a lights-out keyboard plant in Texas in the 1980s, though fixed tooling made it too inflexible for product changes. GE ran highly automated Pro-80 lightbulb lines in Winchester, Virginia through the late '80s and early '90s, producing over 10,000 units per hour before the plant closed in 2010.
Even Philip K. Dick imagined self-replicating factories in his 1955 story "Autofac." The idea has been around for decades. What's changed is that the technology finally makes it viable.
Are There Fully Automated Warehouses and Factories Today?
Yes, but in limited numbers.
Fully dark factories show up mainly in industries with highly standardized, repeatable products:
- Electronics
- Semiconductors
- Robotics manufacturing itself
Automated warehouses using AS/RS (automated storage and retrieval systems) and AMRs (autonomous mobile robots) are far more common than fully dark production floors. Warehouse logistics involve fewer variable, precision-dependent steps than manufacturing.
Real-World Dark Factory Examples Around the World
Several manufacturers already run extended unattended production—or come close:
- FANUC (Japan) has run lights-out production since 2001, building roughly 50 robots per 24-hour shift. Unattended run reports range from 30 days to 600 hours, with humans stepping in mainly for maintenance.
- Philips (Netherlands) runs an electric razor plant with 128 robot arms on assembly. Humans still supervise each shift; the plant is automated, not empty.
- XPeng Motors (China) uses 210 ABB robots for welding and gluing at its Zhaoqing facility. That is workshop-level automation, not proof the full vehicle plant runs dark.
- Xiaomi (China) describes a fully automated smartphone line that can produce over 1 million flagship phones in a lights-out plant.
- ASE Group (Taiwan), a semiconductor packager, reported 56 lights-out facilities by 2024 and has trained more than 700 automation engineers to support them.
The installed base behind these cases is large: the world now has 4.664 million industrial robots operating, up 9% year over year, with 542,000 new installations in 2024 alone. That infrastructure makes dark-factory-level automation possible, even if most of those robots still work in staffed facilities.
Does the US Have Fully Automated Factories?
No US factory runs 100% lights-out today. The closest comparison is Tesla, which has reported 95% automated production at its Shanghai Gigafactory (though it's unclear exactly how that figure was calculated). That plant is in China, not a US benchmark.
Why the Gap Exists
- China and Japan build new: Greenfield plants designed from scratch around automation
- US manufacturers retrofit: Adding robots to existing, human-designed layouts built decades ago
- Installation numbers reflect this: China installed 295,000 industrial robots in 2024 versus just 34,200 in the US
The Cobot Middle Ground
Hybrid models are more realistic for most US manufacturers. Collaborative robots (cobots) made up 19.6% of 2025 North American robot orders, representing 10.7% of order revenue. That signals a market still leaning on flexible, human-adjacent automation rather than fully worker-free lines.
In practice, this looks like overnight lights-out shifts on existing CNC or semi-automatic equipment: a robot loads and unloads a machining center through the night, and operators return in the morning. That is a dark shift, not a full dark factory—and manufacturers are already running them.
Benefits and Barriers of Going Lights-Out
Key benefits include:
- Lower labor costs through reduced headcount needs
- 24/7 output without shift-change slowdowns
- Fewer errors from consistent, repeatable robotic motion
- Improved worker safety by removing people from hazardous zones
- Smaller footprints with less need for lighting or climate control
Barriers are substantial. In a McKinsey survey of 65 industrial leaders, 71% cited robot capital cost as a challenge and 61% cited a lack of automation experience.
Other common obstacles include:
- Complex retrofits when legacy layouts weren't designed for robots
- Workforce and organizational resistance to change
Full automation works best for high-volume, repeatable production — think automotive, electronics, and semiconductors. High-mix, customized manufacturing is a tougher fit because reprogramming for every variant erodes the efficiency gains.
Who Builds These Systems: Big 4 Robotics and the Role of Integration Partners
Four companies dominate industrial robotics globally: FANUC, ABB, Yaskawa, and KUKA. Reuters identifies FANUC as the world's largest industrial robot maker and ABB as second, with a robotics division generating $2.3 billion in 2024 sales. Yaskawa and KUKA round out the group as ABB's primary rivals.
But buying robots isn't the same as deploying them. Success depends heavily on system integrators: the engineers who design cells, program robots, validate performance, and commission the line before it ever runs production.
GLOBAL Automation Technologies is a Level 5 FANUC Authorized System Integrator and the largest US purchaser of FANUC robots among integrators in 2025. It builds turnkey robotic systems across:
- Welding and painting
- Dispensing and material handling
- Machine tending (CNC loading, press tending, injection molding)
Machine tending cells typically pay for themselves in 12 to 18 months through higher spindle utilization and extended unattended operation.
GLOBAL also pairs its engineering division with a technical staffing arm, supplying the controls engineers and robot programmers manufacturers need to run these systems long-term. For most manufacturers, that combination (a validated automation cell plus the people to sustain it) delivers real lights-out-level results without the cost or risk of building an entire dark factory from scratch.
Frequently Asked Questions
What is an automated factory?
An automated factory is one where raw materials enter and finished goods leave with little to no manual human intervention in the core production steps. It's a broader term than "lights-out," which requires zero onsite human presence.
Are there fully automated factories?
A small number exist, including facilities run by FANUC, Xiaomi, and ASE Group. Most still rely on people for exception handling, maintenance, and quality assurance.
Do dark factories exist?
Yes, but they're rare and concentrated in electronics, robotics, and semiconductor manufacturing, where products are highly standardized and repeatable.
What does "lights-out" mean in manufacturing?
It means production continues without lighting, heating, or human presence on the factory floor. Remote monitoring is still allowed.
Does the US have fully automated factories?
No. The closest examples are hybrid, lights-sparse models like Tesla's Gigafactory operations, which reportedly hit high automation rates in select processes rather than plant-wide.
Who are the big 4 in robotics?
FANUC, ABB, Yaskawa, and KUKA are widely recognized as the leading global industrial robot manufacturers, with FANUC and ABB ranked first and second by market presence.
