Measures target China-dominated polysilicon market as Washington seeks to expand domestic manufacturing for semiconductors, solar power and AI infrastructure
The White House on Thursday imposed a 15% tariff and minimum import prices on polysilicon and related products, targeting a critical raw material dominated by China as President Donald Trump’s administration seeks to strengthen U.S. semiconductor and solar supply chains.
The measures, imposed under Section 232 of the Trade Expansion Act of 1962, are designed to encourage domestic production of polysilicon and its derivatives and reduce U.S. dependence on foreign supply chains considered strategically important to artificial intelligence, energy and national security.
“The plan of action in this proclamation will, among other things, help ensure the commercial viability of United States production of polysilicon and its derivatives that is necessary to meet United States economic and national security requirements,” the order said.
The trade protections will take effect on December 4, giving importers several months to adjust supply contracts before the new regime begins.
Under the White House plan, imported polysilicon will face a minimum price of $21 per kilogram, while polysilicon ingots and wafers will have minimum import prices of $100 per kilogram. Solar cells will face a floor of $0.22 per watt and solar modules, or panels, a floor of $0.38 per watt.
The administration will combine those price floors with a 15% tariff on covered polysilicon products, creating a two-part system intended to prevent foreign suppliers from undercutting U.S. manufacturers through low-cost imports.
The proclamation also authorizes the Commerce Department to establish an incentive programme for companies investing in factories producing polysilicon and derivative products.
The hybrid approach of tariffs and minimum import prices was first reported by Reuters.
A Chokepoint in The AI And Solar Supply Chains
Polysilicon is an ultra-pure form of silicon that sits near the beginning of two strategically important manufacturing chains. In solar manufacturing, polysilicon is converted into wafers, which are processed into solar cells and eventually assembled into panels. In semiconductor manufacturing, highly refined silicon is used to produce wafers that form the foundation of modern chips.
China dominates global polysilicon production, making the material another potential chokepoint in the intensifying U.S.-China technology and industrial competition.
For Washington, the issue extends beyond solar power. The semiconductor industry requires highly refined silicon materials, while the expansion of AI is driving enormous investment in chip factories, data centers and electricity infrastructure.
The Semiconductor Industry Association estimates that the chip industry accounts for only 2.4% of global polysilicon demand. However, the much larger solar industry helps sustain the commercial ecosystem needed to produce polysilicon at scale, making solar demand important to the availability and economics of the material for semiconductor manufacturing.
That creates a strategic link between two industries that are increasingly central to U.S. industrial policy.
The United States currently has two polysilicon factories. Hemlock Semiconductor operates a Michigan plant through a joint venture between Corning and Japan’s Shin-Etsu Handotai. Munich-based Wacker Chemie operates another facility in Tennessee.
“Today’s decision encourages continued investment in U.S. capacity and supports long-term U.S. competitiveness,” a Corning spokesperson said.
Wacker said it was reviewing the measures to assess their full impact.
“We appreciate the Administration’s continued engagement on the issue given the ramifications for semiconductor supply chain resilience, advanced computing infrastructure, and broader U.S. defense and security interests,” the company said in a statement.
The new policy could improve the economics of domestic polysilicon production by limiting the ability of overseas suppliers to compete solely through lower prices. It could also make new U.S. investment more attractive by giving producers greater certainty over the competitive environment.
The key question, however, will be whether the price floors and tariffs are sufficient to justify the enormous capital expenditure required to build and expand polysilicon, wafer and semiconductor facilities in the United States.
Solar Industry Faces Higher Input Costs
The measures were welcomed by U.S. solar manufacturers, which have spent years accusing Chinese producers of dumping solar products into the U.S. market, benefiting from government subsidies and shifting production to third countries to avoid existing U.S. trade barriers.
U.S. solar manufacturing has expanded since Congress introduced tax incentives in 2022, but much of that expansion has focused on final panel assembly. Domestic manufacturers remain dependent on imported wafers and solar cells, which require significantly longer investment cycles to produce at scale.
Companies with U.S. solar operations, including T1 Energy, First Solar and Qcells, the U.S. solar arm of South Korea’s Hanwha, welcomed the new measures.
“This is a decisive win for advanced American manufacturing and investment in domestic energy supply chains,” T1 Energy CEO Dan Barcelo said.
T1 is investing $510 million in a solar-cell factory in addition to its Texas panel plant.
The policy could therefore encourage companies to move further upstream, from panel assembly into cells, wafers and polysilicon. That would support Washington’s broader objective of building a domestic solar supply chain rather than simply assembling imported components in the United States.
The trade-off is potentially higher costs. Solar developers and panel buyers could face more expensive equipment if tariffs and minimum prices increase the cost of imported materials and components. Companies that purchase solar panels have noted that the delayed implementation is necessary to give them time to renegotiate supply contracts and adjust to potentially higher prices.
December Start Could Trigger Import Rush
The four-month gap before the measures take effect creates a potential incentive for companies to accelerate imports.
Tim Brightbill, a trade attorney with Wiley Rein who has brought several trade cases against Chinese solar companies, warned that the delay could produce a surge in imports before December 4 as companies seek to bring products into the United States ahead of the new restrictions.
That possibility could temporarily boost inventories and alter trade flows before the new pricing regime takes effect. The longer-term impact will depend on whether the measures actually stimulate new domestic capacity or primarily raise the cost of imported materials.
That distinction is important because polysilicon production is capital intensive and requires substantial investment, specialized technology and access to relatively inexpensive energy. Establishing a competitive U.S. supply chain cannot be achieved simply by restricting imports.
The announcement adds polysilicon to the expanding list of strategic technologies and materials caught in the broader U.S.-China economic confrontation.
Washington has increasingly sought to reduce reliance on Chinese supply chains for semiconductors, batteries, critical minerals, solar equipment and other technologies viewed as important to national security and economic competitiveness.
The Trump administration’s latest measures therefore serve two objectives: protecting an existing U.S. manufacturing base and encouraging investment in new capacity.
The success of the policy will ultimately be measured not by the tariff rate, but by whether it leads to a deeper domestic supply chain spanning polysilicon, wafers, cells, modules and semiconductor manufacturing.
If new investment follows, analysts expect the measures could strengthen U.S. control over a critical input at a time when AI is accelerating demand for both advanced chips and electricity infrastructure. But if investment fails to materialize, the immediate result could instead be higher costs for U.S. solar and technology manufacturers without a corresponding increase in domestic supply.
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