Musk Drives Vertical Integration of U.S. Solar Supply Chain as Polysilicon Plans Emerge
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Musk is using Tesla and SpaceX to plan a combined 200GW of solar capacity, stretching from cells and modules all the way up to wafers and possibly polysilicon — an attempt to build a full supply chain on U.S. soil without relying on China.
What exactly is Tesla's 100GW factory going to make?
Tesla plans a 100GW manufacturing hub in Texas covering the entire chain: ingot growth, wafer slicing, solar cells, and modules, aimed at the utility-scale solar market.
The chosen technology is TOPCon — a mainstream cell design that boosts conversion efficiency. Equipment orders have already gone to Chinese suppliers Laplace and JSG (晶盛机电).
This means → Tesla is not just assembling panels. It wants every step from raw silicon to finished module done in America.
Why did SpaceX pick a different technology?
SpaceX is building a 10GW cell factory in Austin and Bastrop, Texas, using HJT — heterojunction technology, a higher-efficiency but costlier cell design. The equipment supplier is China's Maxwell (迈为股份).
The use case is different: SpaceX's capacity serves Starlink and future space-based AI computing, which demand higher cell performance — hence HJT over TOPCon.
The project secured regulatory approval before the latest export-control tightening, so equipment delivery faces no major obstacles. This means → SpaceX has a more comfortable timeline than Tesla.
Who won the wafer-stage orders?
The first-phase 10GW wafer line was awarded exclusively to JSG (晶盛机电) for roughly RMB 3 billion, covering 210mm monocrystalline ingot furnaces and slicing equipment. Delivery and commissioning in the U.S. are expected to begin in Q3.
The second-phase 40GW expansion goes to Linton Technologies (连城数控). After acquiring New York-based Kayex, Linton will supply CCZ — continuous Czochralski — crystal-growth furnaces to produce aerospace-grade ultra-thin wafers at 40–50 microns.
In plain terms = Linton's equipment is assembled inside the U.S., qualifying for domestic-manufacturing subsidies while sidestepping tariffs — two birds, one stone.
How real are the polysilicon rumors?
As downstream capacity scales up, upstream polysilicon becomes the critical bottleneck. Musk is reportedly pursuing a dual-track strategy: negotiating with OCI to lock in non-Chinese, high-purity polysilicon from its Southeast Asian plants, meeting IRA (the Inflation Reduction Act — a U.S. subsidy framework for clean-energy manufacturing) incentive requirements.
Separately, Chinese media citing market sources report that Musk may have signed equipment contracts covering 400,000 tonnes of polysilicon capacity, with equipment supplied by Morisimatsu's Shanghai subsidiary and chemical-plant contractors, and engineering design handled by Xi'an Hualu Engineering.
This means → if confirmed, Musk's ambition goes beyond "Made in America" — he wants to control the very top of the supply chain.
Could Chinese export controls derail the plan?
China tightened advanced-manufacturing equipment export controls again in May, timed just before Trump's China visit. Markets worry Tesla's equipment deliveries could face delays.
SpaceX's project, approved before the tightening, is less exposed. Tesla's 100GW equipment orders, however, sit in a sensitive window.
This reflects two core variables behind the entire strategy: the trajectory of U.S.–China equipment export controls and the durability of IRA subsidies — both carrying significant uncertainty today.
Content is for reference only, not financial advice.