Elon Musk’s Tesla TSLA and SpaceX SPCX are becoming increasingly intertwined. The two companies are now working together across semiconductors, energy storage, AI computing and connectivity. The increasing operational overlap creates potential synergies, but it also raises questions about how much of this demand reflects the open market, and how much simply reflects Musk choosing to buy from himself.
AI Chip Bottlenecks Across TSLA & SPCX
Tesla needs more AI chips to scale Optimus, which Musk identified as a major production constraint on the latest earnings call. SpaceX also needs significant computing capacity for its AI initiatives.
Both companies are therefore working on Terafab, an advanced semiconductor facility intended to address their growing chip requirements. The project involves an initial $16.8 billion investment and is designed to integrate chip manufacturing, packaging, and testing in a single vertically integrated site.
Musk has indicated that Tesla and SpaceX’s combined AI compute demand could exceed 1 terawatt annually, far above current global chip output, positioning Terafab as a critical capacity expansion effort. The chips produced are expected to be optimized for edge computing and inference, powering Tesla’s Optimus robots and Cybercabs, as well as SpaceX’s planned space-based data centers.
SpaceX As a Growing Megapack Customer
SpaceX is already a significant customer of Tesla Energy. It purchased $329 million of Tesla Megapacks in the first half of 2026, following $506 million of purchases in 2025. The demand is linked to SpaceX's expanding AI infrastructure.
Musk said AI training workloads can cause power demand to change by as much as 70% in fractions of a second, making battery storage important for stabilizing the power supply.
SpaceX is targeting 20 GW of power and cooling capacity by the end of 2027, although Musk said 15 GW may be a more realistic target. If SpaceX approaches these capacity targets, its demand for Megapacks could increase significantly. Tesla’s new Megapack 3 and Megablock are set to expand capacity as demand from data centers increases.
Shared AI Computing Infrastructure
Tesla's humanoid robot Digital Optimus is being built around SpaceX's infrastructure. Musk described SpaceX as the “big model” that acts as a manager for Digital Optimus and provides it with tasks.
Grok, developed under SpaceX, is also being integrated into Tesla vehicles. Meanwhile, Macrohard— the joint AI project between Tesla and SpaceX— sits alongside this as another shared bet.
These initiatives are still developing, but they show that computing infrastructure and AI capabilities are increasingly being shared across Musk's businesses.
Starlink Integration in Tesla Vehicles
The relationship also extends to connectivity.
Starlink connectivity is being integrated into Cybercab and is expected to eventually reach most vehicles in supported markets.
For Tesla, reliable satellite connectivity could help address cellular coverage gaps for robotaxis. For SpaceX, Tesla's vehicle fleet provides a large potential distribution channel for Starlink.
Synergies Are Real But With a Related-Party Caveat
These linkages reflect genuine operational synergies. AI systems require stable power. Tesla and SpaceX both need AI chips and computing infrastructure. Autonomous vehicles require reliable connectivity. These needs would exist even if the companies were not controlled by the same person. Also, the pricing disclosed so far for Megapack and Cybertruck purchases appears to be on market terms rather than preferential.
However, related-party transactions still need to be viewed differently from external customer demand. For instance, a large order from a major external customer, such as a hyperscaler or data center operator, would provide better evidence of market demand for Tesla Energy products.
SpaceX's purchases demonstrate genuine demand from SpaceX, but they also reflect Musk's decision to source from another company he controls. The same consideration applies to Terafab and the shared AI initiatives.
For now, the Musk ecosystem is creating real efficiencies across its companies, but investors should distinguish between Musk-driven demand and independently validated market demand.
Both Tesla and SpaceX stocks currently carry a Zacks Rank #3 (Hold). You can see the complete list of today’s Zacks #1 Rank (Strong Buy) stocks here.
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