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Land clearing underway · Phase 1 committed

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Terafab explainer

Tesla + SpaceX AI chip fab · Grimes County, Texas

Terafab is a planned semiconductor factory — a “fab” — that Tesla and SpaceX said they will build together in Grimes County, Texas. A fab is the plant that turns silicon wafers into finished chips. The companies describe this one as vertically integrated: logic, memory, packaging, and test under one roof, aimed at their own AI hardware rather than selling wafers to the public.

Share on X

Phase 1 investment

~$16.8B

SpaceX + Tesla, committed

Multi-phase ceiling

~$119B

Filings; not all committed

Phase 1 jobs

~3,000

Grimes / Brazos hiring

Planned footprint

~100M sq ft

Full build-out

Compute target

~1 TW / yr

Long-term ambition

A fab, in three steps

1. Wafers

Blank silicon discs enter the line. Patterning and etch define transistors at nanometer scale.

2. Package

Finished die are cut, stacked or placed in a package, and wired to the board.

3. Test & ship

Each part is tested. Reported Terafab intent is to keep those steps on the same campus.

How to read Terafab

What a fab actually is

Chips start as round silicon wafers. A fab runs those wafers through hundreds of lithography, etch, and deposition steps, then the die are cut, packaged, and tested. Most AI companies buy that work from merchant foundries (TSMC, Samsung, Intel Foundry). Terafab is an attempt to do more of that chain in-house so Tesla and SpaceX are not only customers in someone else’s queue.

Where, and who is building it

On August 6, 2026, Texas Governor Greg Abbott and SpaceX said the site is Grimes County — rural land northwest of Houston and near College Station / Brazos County. Tesla is a joint investor. Public statements call Phase 1 more than $16.8 billion of capital and about 3,000 jobs, with many hires expected from Grimes and Brazos counties. SpaceX has said 60–80% of new hires at its other Texas sites have been local.

Why it is called Terafab

“Tera” points at a long-term compute target on the order of one terawatt of AI capacity per year — a scale ambition, not Phase 1 output. Full build-out figures cited in reporting include roughly 100 million square feet and a multi-phase investment ceiling around $119 billion. Only the first phase is described as committed. Treat later phases as optional until a new commitment is on the record.

What the chips are for

Two reported uses. Tesla-side: inference silicon for Optimus humanoid robots and Cybercab robotaxis, so those products are not gated only by outside foundry capacity. SpaceX-side: processors for orbital / space-based data centers — machines Starship is supposed to make cheap enough to launch. That orbital-compute story is why a chip plant shows up on an unofficial SPCX desk even though Tesla is a co-investor.

How this differs from buying Nvidia or TSMC wafers

A captive fab is slower and costlier to stand up than a purchase order. The trade they are making is control: supply, packaging, and a process tuned for their boards. Reporting has said Tesla discussed Intel’s next-generation 14A process for Terafab. That is public commentary, not a finished process qualification or a yield proof.

Where the project actually is

Site selected. Phase 1 capital on the public record. Texas offered a $30 million Enterprise Fund grant; JETI school agreements are signed. Local reporting through August 2026 showed land clearing. Texas comptroller / JETI papers list a construction start around 1 Dec 2026 and completion by end of 2028. There is not yet public confirmation of a finished cleanroom, installed process tools, or wafers out the door.

Why it matters for SPCX holders

Phase 1 is a large, committed cash use. Later phases are optional. If the plant works, SpaceX would own more of the AI-silicon stack that Optimus, Cybercab, and orbital data centers would need — the same vertical-integration idea as Starship and Starlink. That is capex and execution risk, not a booked earnings line, and nothing here is investment advice.

Milestone tracker

Site selected
Done2026-08-06
Grimes County, Texas — Governor Abbott / SpaceX announcement.
Phase 1 committed
Done2026-08-06
~$16.8B capex and ~3,000 jobs on the public record.
Land clearing / site prep
Underway2026-08-10
Local reporting and drone footage of earthwork near the site.
Vertical construction & tools
Ahead2026-12-01
JETI papers cite a construction start around 1 Dec 2026 and completion by end of 2028. No public confirmation of a building shell or tool install yet.
First production
Ahead
Public commentary has pointed at a ~2027 window. Unconfirmed.
Later phases / ~1 TW
Ahead
Optional expansions. Treat as an ambition until a new phase is committed.

Risks — keep it balanced

The ~$119B figure is a multi-phase ceiling from filings, not a committed spend. Chip yields, process choice, power, water, permits, and schedule can slip. A $30M Texas Enterprise Fund grant and JETI qualification help the site; they do not guarantee wafers.

Latest public notes

Sources: Office of the Texas Governor — SpaceX expansion in Grimes County (2026-08-06); Reuters — $16.8B initial Terafab investment (2026-08-06); TechCrunch — multi-phase filings up to ~$119B (2026-08-06); KBTX — land clearing near the Terafab site (2026-08-11). Educational compilation of public reporting. Figures refresh when new copy appears.

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