October 4, 2026 09:00 AM PST
(PenniesToSave.com) – Elon Musk has never been known for thinking small, and his latest project may be the clearest example yet. SpaceX and Tesla are planning Terafab, a semiconductor plant in Grimes County, Texas, designed with more than 100 million square feet of manufacturing space [3]. If it is built as described, it would be the largest building on Earth by a wide margin [2].
Musk has described the project in sweeping terms of his own, according to remarks first reported by the Express and carried by the Mirror US [3].
“The largest and most valuable building on Earth by far.”
Elon Musk, as reported by the Express via the Mirror US [3]
The reasoning behind the size is practical. Both companies need enormous quantities of advanced chips for artificial intelligence, humanoid robots, and self-driving vehicles [1][3]. Tesla currently buys its chips from outside suppliers, an arrangement Supercar Blondie says has created cost and supply bottlenecks [2].
The stakes reach beyond corporate strategy. The project carries a grant funded by Texas taxpayers, a promise of thousands of jobs, and a direct link to a publicly traded SpaceX whose roughly $2 trillion valuation leans heavily on its AI ambitions [1][3]. The outlets covering Terafab also disagree on several key points, including its cost, its partners, and when construction begins, so the details deserve a careful look.
Quick Links
- What Is Terafab, and Who Is Behind It?
- How Does Terafab Compare With the Largest Buildings Standing Today?
- How Much Will Terafab Cost, and Who Is Paying for It?
- Why Would Tesla and SpaceX Build Their Own Chips?
- What Could Terafab Mean for Jobs and Local Communities?
- What Does Terafab Mean for Savings and Retirement Accounts?
What Is Terafab, and Who Is Behind It?
Terafab is planned as a vertically integrated chip plant. That means it would make, package, and test advanced logic and memory chips under one roof, according to Reuters reporting cited by the Motley Fool [1]. SpaceX has said that combining those steps in a single location could speed technological progress and accelerate the rollout of new computing infrastructure, the Mirror US reported [3].
The sources do not fully agree on who is involved. The Motley Fool describes Terafab as a SpaceX project pursued in partnership with Tesla [1], and the Mirror US also names SpaceX and Tesla [3]. Supercar Blondie calls it a joint venture between Tesla, SpaceX, and Intel, while its own timeline lists xAI as a partner as well [2]. Neither of the other outlets mentions Intel or xAI.
Supercar Blondie also published the most detailed timeline, though it did not say where its dates came from [2]. According to that outlet, Musk first raised the need for an in-house chip plant during a January 2026 earnings call, the joint venture took shape in April, SpaceX filed plans for the Grimes County complex in May, and the companies announced the first phase in August. The outlet says early small-batch runs of Tesla’s fifth-generation AI5 chips are targeted for late 2026, with commercial mass production planned for 2029 [2].
Supercar Blondie’s headline says work begins in December, but the body of its report does not repeat that date, and neither of the other sources gives a start date [2]. The same outlet reports that Terafab could eventually turn out 100 billion to 200 billion AI and memory chips per year, a figure no other source confirms [2].
How Does Terafab Compare With the Largest Buildings Standing Today?
Naming the largest building in the world depends on what gets measured, and the sources use two different yardsticks.
By floor space, Supercar Blondie identifies Chengdu’s New Century Global Center in China as the current record holder, with 18.9 million square feet of usable indoor space [2]. Terafab’s planned 100 million square feet would be more than five times that.
By volume, the Mirror US points to Boeing’s factory in Everett, Washington, which encloses more than 472 million cubic feet, or about 13.3 million cubic meters [3]. The Everett plant covers 98 acres, compared with roughly 85 acres for the original Disneyland park in Anaheim, California. Since opening in 1967, it has produced more than 5,000 wide-body aircraft. When the building was new, clouds would form beneath its 90-foot ceiling from built-up moisture, though air conditioning now keeps that from happening [3].
The Mirror US estimates Terafab’s internal volume at roughly 100 million cubic meters, about 7.5 times Boeing’s capacity [3]. The outlet adds that the plant could stretch for three miles and would cover an area equal to about 1,736 American football fields [3].
Each of these comparisons comes from a single outlet and rests on design projections rather than finished construction. Even so, on paper the plant would far exceed the factory that currently holds the world record for volume, according to the Mirror’s figures [3]. That kind of scale has not been attempted in American manufacturing before, and it raises the bar for how much the companies must deliver to justify it.
How Much Will Terafab Cost, and Who Is Paying for It?
The price tag is where the sources diverge the most, and the gap is large. Supercar Blondie reports that SpaceX and Tesla formally announced a $16.8 billion first phase for the Grimes County campus in August 2026 [2]. The outlet did not cite a filing or announcement for that figure.
The Motley Fool and the Mirror US both quote the same Reuters report, which said a May filing showed SpaceX proposing an initial investment of $55 billion, rising to $119 billion if extra phases are completed [1][3]. Because both outlets rely on one Reuters passage, those numbers amount to a single report rather than two independent confirmations. The Motley Fool separately says SpaceX is expected to spend more than $100 billion to scale the facility [1]. None of the sources explains how the $16.8 billion and $55 billion figures relate to each other.
Public money is part of the package. Texas Governor Greg Abbott’s office announced that SpaceX will receive a $30 million grant from the Texas Enterprise Fund, the Mirror US reported, and said the project is eligible for the state’s Texas Jobs, Energy, Technology, and Innovation program, known as JETI [3].
Measured against the overall cost, the grant is small. It equals about 0.05% of the $55 billion initial figure, or about 0.18% of the $16.8 billion first phase estimate. The vast majority of the money at stake is private capital, put up by the companies and their shareholders rather than by taxpayers. That is a meaningful distinction at a time when many large industrial projects lean heavily on government support.
Even so, public dollars deserve public accountability. Texans have a fair claim to see whether the jobs that helped justify the grant actually materialize, and on what timeline.
Why Would Tesla and SpaceX Build Their Own Chips?
Behind Terafab’s scale is a supply problem. Tesla currently depends on outside chip suppliers such as Samsung, Micron, and TSMC, an arrangement that Supercar Blondie says creates financial and supply chain bottlenecks [2]. A spokesperson quoted by the outlet said the two companies’ combined demand for chips is expected to outrun what the world can currently produce [2].
“One terawatt of compute, which is significantly larger than the current global supply.”
A spokesperson, as quoted by Supercar Blondie [2]
The spokesperson said the companies appreciate their existing suppliers and encourage them to expand production, but described the gap between supply and demand as the core reason for building Terafab [2].
The chips would serve a wide range of Musk ventures. According to the Mirror US and Reuters reporting cited by the Motley Fool, they are meant to power Tesla’s Optimus humanoid robots and autonomous Cybercabs, along with high-power chips for SpaceX’s proposed space-based data centers [1][3].
The broader industry supports the premise that chips are the bottleneck. The Semiconductor Industry Association describes semiconductors as the foundational technology behind AI and a significant share of the value in a modern AI server, the Motley Fool reported [1]. OpenAI CEO Sam Altman has tied revenue growth directly to added computing power, and Anthropic CEO Dario Amodei has said rapid AI adoption could strain the semiconductor industry’s capacity [1].
There is a national angle as well. Supercar Blondie describes Terafab as both a commercial and a geo-strategic move [2]. Keeping more of the most advanced manufacturing steps inside the United States, rather than relying on outside suppliers, is a goal that tends to draw support across the political spectrum.
What Could Terafab Mean for Jobs and Local Communities?
Texas Governor Greg Abbott’s office announced that the first phase of Terafab will create 3,000 new jobs, the Mirror US reported [3]. Supercar Blondie cited the same figure but presented it as a belief rather than a confirmed number [2]. Musk said the project would bring cutting-edge manufacturing to America and create thousands of high-paying jobs in Texas, according to the Mirror US [3].
Projects like this are the kind of private investment that states compete hard to win, and Texas put incentives on the table to land it, including the $30 million Enterprise Fund grant and eligibility for the JETI program [3]. For Grimes County, a facility of this size could mean new demand for construction crews, technicians, and the local businesses that serve them.
There are reasons for patience. The 3,000 job figure comes from state officials who championed the project, and it describes only the first phase [3]. Commercial mass production is not planned until 2029, according to Supercar Blondie [2], so the full payroll may take years to arrive. The conflicting cost figures already reported also suggest the final scope of the project is not yet settled [1][2][3].
For workers and families in the region, the most useful approach is to treat the announcements as promises worth tracking rather than guarantees, and to judge the project by the jobs that actually appear.
What Does Terafab Mean for Savings and Retirement Accounts?
SpaceX now trades publicly on the Nasdaq under the ticker SPCX, and Tesla trades under TSLA [1]. That ties Terafab’s success or failure directly to the stock market. According to the Motley Fool, SpaceX’s IPO prospectus says more than 90% of the company’s long-term growth opportunity relates exclusively to AI, and the outlet argues that if SpaceX cannot scale its AI business, its current valuation of roughly $2 trillion will be very hard to justify [1].
The financials so far show how much is riding on future results. The Motley Fool reports that SpaceX lost about $5 billion in 2025 and $541 million in its most recent quarter, with large capital expenditures still ahead [1]. The Motley Fool piece is written for prospective investors and frames its analysis around when shareholders might profit, so its conclusions should be weighed with that purpose in mind [1].
For most households, the practical lesson is about concentration. A company valued in the trillions on the strength of a building that has not yet been finished carries real risk alongside its potential. Anyone considering buying shares directly should understand the basics of investing in individual stocks, including how much of a portfolio any single company should represent.
Many people already own stocks indirectly through funds, which makes it worth knowing what those funds hold and how heavily they lean toward a handful of large technology names. A primer on how exchange-traded funds work explains how to look up a fund’s holdings before adding money to it.
Final Thoughts
Terafab is, at its core, a large private bet on building advanced technology in the United States. Two of the most ambitious companies in the country are proposing to put tens of billions of dollars, and possibly more than $100 billion, into a single Texas campus so they can control their own chip supply [1][3]. If it works, it could bring a new layer of high-tech manufacturing to American soil and thousands of jobs to Grimes County, according to the project’s backers [3].
The unanswered questions are just as real. The reported cost ranges from $16.8 billion for a first phase to $119 billion for the full buildout, depending on the source [1][2][3]. The partner list differs between outlets, and the December start date appears only in one headline [2]. Mass production is not planned until 2029 [2], and SpaceX is still losing money as it spends heavily to get there [1].
For households, the takeaway is simple. Watch whether the promised jobs and production milestones arrive on schedule, and expect Texas officials to hold the project to the commitments attached to public money. On the investing side, resist the pull of headline-driven bets on any single company. Patient, diversified saving through tax-advantaged retirement accounts does not depend on any one company’s construction schedule.
Works Cited
[1] Vanzo, Ryan. “SpaceX’s Terafab Will Be Bigger Than Any Building on Earth. Here’s When Investors Will Profit.” The Motley Fool, Yahoo Finance, 1 Oct. 2026, finance.yahoo.com/technology/ai/articles/spacexs-terafab-bigger-building-earth-232500302.html.
[2] Renesis, Alessandro. “Tesla and SpaceX Are Starting Work on the Biggest Building in the World in December in Huge 100 Million Square Feet, $16.8 Billion ‘Terafab’ Project.” Edited by Mason Jones, Supercar Blondie, 2 Oct. 2026, supercarblondie.com/tesla-spacex-chip-plant-terafab/.
[3] Dobinson, Chloe. “World’s Largest Building with Own Weather Set to Be Dwarfed by $119bn Texas Megastructure.” The Mirror US, 3 Oct. 2026, www.themirror.com/news/us-news/worlds-largest-building-weather-set-2050466.