Tesla Stock Falls as $16.8 Billion Terafab Plan Raises Funding Questions

Key Takeaways

• Tesla stock closed 0.63% lower at $319.53 as investors assessed the financial and operational risks surrounding the Terafab project.
• Tesla and SpaceX plan to invest more than $16.8 billion in the first phase, while a fully expanded facility could cost as much as $119 billion.
• Funding responsibilities, ownership, Intel’s role and the allocation of chip output remain unclear for Tesla shareholders.

Tesla Stock Slips as Terafab Becomes Its Latest Capex Test

Tesla stock ended Thursday at $319.53, down $2.02, or 0.63%, as investors considered the scale of Elon Musk’s latest industrial project. The shares subsequently edged higher in after-hours trading.

The market reaction was relatively modest, but the announcement added another major spending commitment to Tesla’s increasingly capital-intensive strategy. Tesla’s valuation now depends heavily on businesses beyond electric vehicles, including autonomous driving, Cybercabs, artificial intelligence and Optimus humanoid robots.

Terafab could support each of those ambitions by giving Tesla access to a dedicated supply of advanced AI chips. However, it also raises questions about how quickly the investment can generate economic returns and how much of the financial burden will ultimately fall on Tesla.

Those concerns are especially relevant after Tesla spent $5.79 billion on capital expenditure during the second quarter and recorded negative free cash flow of approximately $1.09 billion. The company now expects its total 2026 capital expenditure to exceed $25 billion as it expands AI computing capacity, factories and robotics infrastructure.

Why Elon Musk Wants a Vertically Integrated Chip Factory

Terafab is planned as a 100-million-square-foot semiconductor complex in Grimes County, Texas. Unlike a conventional chip factory that focuses on one part of the supply chain, the facility is intended to manufacture advanced logic chips, produce memory, complete packaging and test finished products under one roof.

Musk argues that existing semiconductor suppliers will not be able to increase production quickly enough to meet the future computing requirements of Tesla and SpaceX. The companies expect their combined demand to eventually exceed one terawatt of computing capacity.

For Tesla, the chips could support Optimus robots, autonomous vehicles and Cybercabs. SpaceX plans to use specialised processors for its proposed space-based AI data centres and computing spacecraft.

Combining several stages of semiconductor production in one location could shorten product-development cycles. Engineers may be able to design a chip, manufacture trial wafers, test the results and revise the design without relying on multiple suppliers across different countries.

The strategy could also reduce exposure to geopolitical disruption and the concentration of advanced semiconductor manufacturing in East Asia. These potential benefits explain the project’s strategic appeal, even though its financial returns remain uncertain.

The $16.8 Billion Investment Is Only the First Phase

The first phase of Terafab represents an investment of more than $16.8 billion and is expected to create approximately 3,000 jobs. The project has also received a $30 million performance-based grant from the Texas Enterprise Fund and qualifies for additional state incentive programmes.

However, the headline figure should not be viewed as the final cost.

Earlier project documents outlined a broader proposed investment of around $55 billion. If all additional phases are completed, total spending could eventually rise to approximately $119 billion.

Estimates from semiconductor analysts also illustrate the size of the challenge. A leading-edge plant capable of producing 100,000 logic wafers per month could require between $30 billion and $45 billion before including all the memory, packaging and testing capacity envisioned for Terafab.

The $16.8 billion commitment therefore appears to be an entry price rather than a spending ceiling. Construction delays, equipment shortages, design changes and weak early production yields could push costs considerably higher.

Intel Brings Expertise, but Its Terafab Role Is Unclear

Intel’s involvement may reduce some of Terafab’s technology risk. The US chipmaker has decades of experience in process development, wafer fabrication and advanced packaging—areas in which Tesla and SpaceX have limited high-volume production experience.

Designing AI chips and operating large factories does not automatically translate into the ability to manufacture leading-edge semiconductors. Chip fabrication requires specialised engineers, access to scarce lithography equipment, strict contamination controls and the ability to achieve commercially acceptable yields across millions of components.

Bringing logic, memory and advanced packaging into one complex introduces further integration challenges. A problem in one part of the production chain could delay the entire manufacturing ramp.

Intel has confirmed its participation, but detailed information about its capital contribution, equipment commitments, intellectual-property rights and operational responsibilities has not been disclosed. It is also unclear whether the proposed 2029 production target refers to experimental wafers, limited production or genuine high-volume output.

Equipment orders, process-node selection, engineering recruitment, trial wafers and production yields will therefore be more meaningful indicators of progress than the size of the factory alone.

Tesla Shareholders Still Need to Know Who Pays

The central concern for Tesla stock is not whether the company needs more AI chips. It is how Terafab’s costs and benefits will be divided between Tesla and SpaceX.

Musk has estimated that approximately 25% of Terafab’s computing output could support Tesla’s Optimus programme, while around 75% may be used by SpaceX’s proposed AI spacecraft. That estimate is not necessarily a final allocation agreement, but it suggests SpaceX could become the facility’s largest user.

If Tesla provides a substantial proportion of the capital while receiving only a quarter of the output, shareholders would need evidence that the arrangement provides an appropriate economic return. Important questions include who will own the buildings and equipment, which company will control the intellectual property and how chips will be priced when transferred between Musk-controlled businesses.

The funding structure is equally important. Tesla and SpaceX could use existing cash, issue debt, raise outside capital or establish a separately financed joint venture. Each option would have a different effect on Tesla’s cash flow, balance sheet and shareholders.

Clear disclosure of capital commitments, ownership percentages and long-term supply contracts would help investors determine whether Terafab is primarily a strategic Tesla asset or a broader Musk-company infrastructure project.

What Could Change the Tesla Stock Narrative?

The bullish case is that Terafab could give Tesla greater control over one of the most important inputs for autonomous driving and robotics. Reliable chip supply, faster design cycles and processors optimised specifically for Optimus and Cybercabs could become a meaningful competitive advantage if these products reach large-scale commercial production.

The bearish case centres on cost escalation and execution. Semiconductor factories frequently take years to reach efficient production, while poor yields can sharply increase the cost of each usable chip. Terafab must also compete for engineers and equipment with established manufacturers such as TSMC, Samsung and Intel.

For Tesla stock, the next important developments will be a detailed funding agreement, clarification of Intel’s responsibilities, confirmed equipment orders and evidence that the pilot facility can produce working chips at acceptable yields.

Conclusion

Terafab addresses a genuine strategic problem: Tesla and SpaceX expect their future AI ambitions to require far more specialised computing capacity than existing suppliers may be able to provide. A vertically integrated US chip complex could strengthen supply security and accelerate product development.

However, the $16.8 billion first phase may represent only a fraction of the final cost. Until Tesla explains its financial contribution, ownership rights and share of the output, investors are likely to treat Terafab as another major claim on the company’s capital rather than a proven growth asset. Tesla stock may therefore remain sensitive to any signs of delays, rising costs or additional financing requirements.