A post on X on 6 November, from Arthur MacWaters, said “Terafab is the largest building in human history”. It had more than 340,000 views by 14:00 UTC and quoted Elon Musk’s post that “Terafab is moving fast”. The Terafab website lists Terafab at 100,000,000 ft² next to 10,000,000 ft² for Tesla’s Gigafactory in Texas. By our arithmetic, that is 10 times Giga Texas.
A short explainer on vertical integration. It teaches the general idea only and does not discuss this story.
The key insight: As we read it, the viral claim compares a plan with finished buildings: the companies list Terafab at 100,000,000 ft², 10 times Giga Texas by our arithmetic, while the Grimes County site had been cleared after an August groundbreaking, Spectrum News reported, and SpaceX’s S-1 called Terafab a “general framework”, per Electrek.
Update (7 November, 15:01 UTC): The Information published a report headlined “The Blue Wave May Not Stop Musk’s Texas Data Center Ambitions”. Only the headline was readable to us; we have not read the article, so its details, sources and any company response are not reflected here. Source: The Information (headline).
Tesla’s 6 August post said: “Terafab will be built in Grimes County, Texas”. It added: “In April, we broke ground on our research fab on the North Campus of Giga Texas”, which it called the precursor to Terafab, and: “This is why we’re building the largest chip manufacturing facility ever”.
TechRadar noted that with the Pentagon at 6.6 million square feet, “50 times” would need about 330 million square feet, a number the company has not disclosed. By our arithmetic, the stated 100 million square feet is about 15 times the Pentagon.
Floor area in million square feet. Terafab is the companies’ stated target for the finished site (terafab.ai), not a built figure. Record figures as reported by Dezeen, Fortune and Guinness World Records; sources differ on which building holds the floor-area record. Boeing Everett holds the Guinness record by volume; its bar shows floor area.
What Was Posted on X
Terafab is the largest building in human history
Starship is the largest and most powerful flying object in human history
— Arthur MacWaters (@arthurmacwaters) Nov 06 08:39
Arthur MacWaters’ post of 6 November, the claim this piece checks: “Terafab is the largest building in human history”. It quotes Musk’s post below. The 100 million square feet in its first image is the companies’ stated target for the finished site, not a built figure.
Elon Musk’s post of 6 November: “Terafab is moving fast”. It quotes Herbert Ong’s post about the Fab Lab at Giga Texas, a separate location from the Grimes County site the size figure refers to.
Terafab will be built in Grimes County, Texas
In April, we broke ground on our research fab on the North Campus of Giga Texas – the precursor to Terafab.
Both Tesla & SpaceX will need far more chips than current & future global production can supply.
This is why we’re building the largest chip manufacturing facility ever, with the goal of producing over 1 terawatt of compute per year
Tesla’s post of 6 August naming Grimes County, Texas, as the Terafab site and saying it broke ground on a research fab on the North Campus of Giga Texas in April.
If you want to iterate fast with radically new chip designs, join the Terafab project!
Elon Musk’s post at 23:53 UTC on 6 November, a recruiting call: “If you want to iterate fast with radically new chip designs, join the Terafab project!”
How It Compares With the Record Holders
Sources differ on which building is the largest today. Fortune said the New Century Global Center in Chengdu, with about 18.9 million square feet of floor space, holds the record. Dezeen named the AvtoVAZ main assembly building in Russia, at 65 million square feet (six million square metres).
Guinness World Records lists the Aalsmeer flower auction building in the Netherlands as the largest commercial building under one roof, at 782,599 m² (8.423 million ft²), area correct as at October 2002. It lists Boeing’s Everett assembly plant as the largest building by volume, at 13.4 million m³, with an indoor floor area of 98.3 acres. By our arithmetic, that is about 4.3 million square feet.
By our arithmetic, Terafab’s stated 100 million square feet would be about 5.3 times the New Century figure Fortune cites and about 1.5 times the AvtoVAZ figure Dezeen cites.
What Is Actually Being Built
Musk’s “moving fast” post quoted Tesla commentator Herbert Ong, whose post said the account @FutureAZA “watched the related Fab Lab at Giga Texas go from bare ground to steel in days”. We covered that post on 6 November. Tesla says it broke ground on a research fab on the North Campus of Giga Texas in April. The Grimes County site is a separate location about an hour northwest of Houston, Electrek reported. Spectrum News said its planned footprint is equivalent to over 1,700 football fields.
Update, 6 Nov, 19:51 UTC: Musk on what Terafab is for. Speaking with Ron Baron at the Baron Investment Conference on 6 November, in a chat Baron Capital streamed on X, Musk said: “if you want to get to, say, a terawatt a year of chip production, which is our goal, that’s the reason it’s called the terafab”. He put global output at “around 20 gigawatts of AI chips, maybe 25” this year and “maybe around 35 to 45 gigawatts of AI chips next year”, and said a terawatt means “30 times what current global production will be roughly next year”. The quotes are from our own machine transcript of the broadcast.
In the same exchange our transcript records “It’s going to cost a trillion dollars. But we won’t need that money immediately”; the transcript does not label speakers. By our arithmetic, 1,000 gigawatts is 22 to 29 times the 35 to 45 gigawatts he cited. The rest of the chat, including his SpaceX revenue forecasts, is in our separate piece.
Update, 6 Nov, 23:07 UTC: Musk on the Austin research fab. Later in the same Baron Investment Conference chat, Musk said Tesla is building a research chip fab at Gigafactory Texas in Austin that will try many different approaches to chip-making, adding that “many of those approaches won’t work, but some of them, I’m sure, will work”. He said the improvements would then go to the production Terafab in Grimes County, Texas, near Texas A&M, “where we’ll scale up production of our AI chips”.
He said the Austin fab may combine “logic, memory, packaging” and lithography “under one roof”, and that “something that would normally take a year, I think we may be able to reduce to a month”. Of wafers in today’s chip fabs, he said that “sometimes it’s maybe 20% of the time that something useful is happening to the atoms on that wafer”. The quotes are from our own machine transcript of the replay, which mis-hears “fab” as “app” in this passage; we render it as fab. By our arithmetic, a year cut to a month is a 12x faster cycle. Tesla’s earlier statement on the research fab is quoted above.
The Structural Read
As we read the sources, the record depends on the measure: Guinness gives Boeing Everett the volume record and Aalsmeer the commercial floor-area record, while Fortune and Dezeen name different holders for floor area.
As we read the figures, Musk’s own two comparisons do not match each other: 100 million square feet is about 15 times the Pentagon by our arithmetic, not the 50 times TechRadar quoted him saying.
As we read the posts, the work Musk called fast is at Giga Texas, where Tesla says a research fab broke ground in April, not the Grimes County site the size figure refers to.
Tesla on X, 6 August 2026
“This is why we’re building the largest chip manufacturing facility ever”
Three Implications
FOR READERS OF THE VIRAL POST The 100 million square feet is the companies’ stated target for the finished site, as the Terafab website and Electrek give it.
FOR RECORD WATCHERS Guinness lists Boeing Everett by volume and Aalsmeer by commercial floor area; Fortune and Dezeen name different floor-area holders.
FOR TESLA AND SPACEX INVESTORS Electrek reported that SpaceX’s S-1 called Terafab a general framework with no binding commitments.
The framework says: “You cannot ship silicon without foundries.”
As we read it, Terafab is Tesla and SpaceX’s plan to own that foundry layer themselves, and its size is the scale they say it needs. The framework does not discuss Terafab, building records or Grimes County.
What Is Not Established
No source we read gives Terafab’s floor area under one roof as opposed to the site; Electrek reports the 100 million square feet as the span of the finished site, and the website lists it as ft² without saying whether it is floor area or footprint. Record lists measure buildings differently, by floor area, volume or footprint. The post’s second image ranks rockets by height; we did not examine it. We did not contact Tesla or SpaceX.
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On the companies’ own figure, 100 million square feet, Terafab would be 10 times Giga Texas and larger than any building named by Fortune, Dezeen or Guinness. Today, on the reporting we read, it is a cleared site in Grimes County, with a research fab under way at Giga Texas, so the claim describes a plan, not a building that exists.
A note on sourcing. Terafab’s 100 million square feet is the figure on the companies’ Terafab website and in their August announcement, as reported by Electrek; it is a stated target, not a measured building. Record figures are from Guinness World Records and from Fortune and Dezeen, which name different record holders. Musk’s quotes are as reported by Fortune and TechRadar. The ratios are our arithmetic. We did not contact Tesla or SpaceX.
Gennaro Cuofano is a CRO and tech executive who has worked in AI since late 2015, starting with bringing NLP, natural-language generation, voice and chatbot products to the marketing industry. His background is in law and finance: he holds a Master's degree in Law and an International MBA with an emphasis on corporate finance (LUISS Business School and the University of San Diego, 2012), and worked as a financial analyst at a real-estate investment firm in San Diego and as an assistant controller. His work focuses on business model strategy, business engineering and, more broadly, structural analysis: how companies make money, read from their own filings. He created FourWeekMBA and leads research there and at The Business Engineer, his newsletter on AI and business strategy, with over 95,000 subscribers and more than 1,000 published analyses. His writing has also appeared on Entrepreneur (for example, How to Digitize a Family Business in Europe) and HackerNoon. Find him on LinkedIn and Substack. See how we source.
