Elon Musk's Terafab project has moved from filing to construction in Grimes County, Texas, with permits indicating a semiconductor manufacturing campus that could exceed $10 billion in initial capital deployment. The facility, anchored by SpaceX as the design customer, represents the largest private semiconductor bet outside Taiwan in a decade.
Permits filed in Grimes County show a 4.2 million square foot clean room complex, approximately 40% larger than Intel's Fab 42 in Chandler. SpaceX has committed to take 60% of initial wafer output under a seven-year supply agreement, with Tesla and Neuralink holding options on the remainder. The first production line targets 5-nanometer process nodes by Q2 2027, with packaging and test operations online 18 months earlier. Musk has installed former TSMC VP of Arizona operations as site lead, a signal that talent poaching from incumbent fabs is underway.
This matters because it tests whether vertical integration can overcome the capital-intensity moat that has kept semiconductor manufacturing consolidated in Taiwan and South Korea. SpaceX's Starlink program burns through 12 million custom chips annually for phased-array antennas, currently sourced from TSMC at yields Musk has publicly called unacceptable. By internalizing production, Terafab targets sub-$80 cost per chip versus $140 landed from offshore foundries, a 43% reduction that changes the unit economics of satellite deployment. If the model works, Tesla's Full Self-Driving silicon and Neuralink's neural interface ASICs follow the same path, collapsing $2.3 billion in annual chip procurement into internal cost.
The Grimes County site sits 90 miles from Austin, close enough for engineering talent but distant enough to avoid Tesla Gigafactory labor competition. Texas has committed $400 million in infrastructure—power substations, water reclamation, and rail spurs—plus a 15-year property tax abatement. The state's deregulated energy grid, often a liability, becomes an asset here: Terafab has contracted 600 megawatts of behind-the-meter solar with Tesla Megapack storage, effectively building a private utility to derisk uptime.
Operators should track two milestones. First, ASML delivery schedules for extreme ultraviolet lithography tools; Terafab has reportedly secured four EUV systems with 2026 delivery, a allocation typically reserved for TSMC and Samsung. That suggests either Musk negotiated with scale leverage or ASML sees credible volume. Second, SpaceX's Q3 2025 chip orders from TSMC; any 20%+ reduction signals internal production is pulling forward. Construction timelines point to initial wafer output by December 2026, with yield ramps through 2027.
The tell will be whether Terafab becomes a merchant foundry or remains a Musk-entity captive shop. If the former, every hyperscaler with custom silicon needs watches Texas instead of Taiwan.