Terafab Is More Interesting Than Its 100-Million-Square-Foot Headline

Terafab has been getting attention because Elon Musk says it will eventually become the largest building on Earth, and that part is certainly hard to ignore. The proposed semiconductor complex in Grimes County, Texas, could eventually contain more than 100 million square feet of manufacturing space; Tesla’s entire Gigafactory Texas is around 10 million.

But the size isn’t actually what I find most interesting. Terafab is an attempt to take an industry built around extraordinary specialization and pull an enormous portion of it back under one roof. That is a much bigger experiment.

Modern chips are rarely the product of one company doing everything. SpaceX describes the plan as a closed-loop facility covering lithography-mask design, logic and memory fabrication, advanced packaging and testing. They don’t just want their own foundry—they want to design a chip, make it, package it, test it, discover what is wrong, change the design and start another iteration without moving the work through several companies around the world.

That is very SpaceX. Applying that philosophy to semiconductor fabrication is considerably harder. A rocket factory is complicated. A leading-edge semiconductor fab is one of the most complicated machines humanity has ever built.

There are actually two Terafab-related projects. The first is a research fab on the north side of Gigafactory Texas in Austin; Tesla broke ground in April. Musk has described it as roughly a $3 billion research operation capable of a few thousand wafer starts per month—not the production volume promised for Terafab. Before attempting a factory an order of magnitude larger than anything Tesla has built before, they are building a smaller place to learn how to be a semiconductor manufacturer. That is more believable than announcing a 100-million-square-foot fab and pretending the expertise appears with the building.

The production site is near Gibbons Creek Reservoir in Grimes County. On August 6, SpaceX, Tesla and the State of Texas formally announced the location. The first phase represents more than $16.8 billion in committed investment and at least 3,000 permanent jobs. Earlier tax-incentive filings describe as much as $119 billion across four phases. I would not treat $119 billion as money already committed. What matters is that the site has been selected, the agreements are signed, and land clearing is underway. Terafab isn’t a factory yet—but it isn’t just a rendering anymore either.

Intel joined in April. Musk has said Terafab plans to use Intel’s upcoming 14A process, while Intel has described its role more broadly as helping Tesla, SpaceX and xAI explore ways to “refactor” semiconductor manufacturing. That partnership makes this much more interesting to me. Process control, yield and high-volume production are not things you hire into existence overnight.

The Terafab site currently identifies three major chip families: AI5, AI6, and D3 for SpaceX. The SpaceX side may eventually be the stranger part—putting large amounts of AI compute into orbit explains why SpaceX suddenly cares so much about owning part of the semiconductor supply chain. The stated goal of more than one terawatt of compute per year needs skepticism. It is enormous, not a conventional fab metric, and not yet production.

Power and water may be just as difficult as the chips. SpaceX says it intends to generate much of Terafab’s electricity itself and to use closed-loop water recycling. Those promises deserve continued scrutiny, and people around the site have legitimate concerns. SpaceX’s own filings say it still expects to obtain a significant portion of its compute hardware from third-party suppliers even after Terafab exists.

I would love to see Terafab in person someday. Not because it is an Elon Musk project, but because watching an attempt to rebuild a substantial portion of the semiconductor supply chain inside a 100-million-square-foot building would be far more interesting than the size headline. That is the part I want to follow.

Read Terafab.