Trump Imposes 15% Tariff on Polysilicon to Bolster US Solar, Chip Supply

President Donald Trump signed an executive order Thursday imposing a 15 percent tariff on imported products made from polysilicon along with minimum price requirements for certain related goods. The measures take effect December 4 and fall under Section 232 of the Trade Expansion Act of 1962. Officials said the steps aim to strengthen domestic production of the material used in semiconductors and solar panels primarily supplied by China.

Polysilicon serves as a foundational input for silicon wafers that become chips for artificial intelligence systems and cells for solar panels. The United States maintains just two domestic facilities one operated by Hemlock Semiconductor in Michigan and another by Wacker Chemie in Tennessee. Trump stated that decades of foreign practices have eroded American capacity in this sector and that the new policy seeks to restore commercial viability for national security and economic reasons.

Solar company shares rose in premarket trading after the announcement. First Solar advanced more than 7 percent Solaredge Technologies gained 1 percent and the Invesco Solar ETF climbed 4 percent. Domestic manufacturers including a joint venture involving Corning welcomed the action as support for continued investment in American output.

Chinese officials responded by accusing the United States of stretching national security arguments and interfering with normal commerce. They argued that such steps raise costs for businesses and consumers without improving long term competitiveness. American solar producers have long claimed that Chinese competitors benefit from government subsidies and shift production to third countries to avoid earlier duties.

The policy extends a pattern of trade actions intended to insulate supply chains for advanced computing and energy. Historical evidence on similar protections shows they often raise input prices for downstream industries while shielding less efficient producers from market pressures. Polysilicon prices already reflect global oversupply driven by state supported capacity abroad and the new tariff adds a direct cost layer that will likely pass through to chip makers and solar project developers.

Domestic output remains limited relative to demand and expansion depends on sustained higher prices rather than improvements in production efficiency. Consumers ultimately bear higher expenses for electronics and electricity generated from solar installations. Previous rounds of tariffs on related goods produced mixed results with some manufacturing shifts occurring but overall reliance on imported materials persisting.

The executive order cites advice from Commerce Secretary Howard Lutnick and emphasizes the need to meet requirements for economic and security infrastructure. Market reactions reflected expectations of near term gains for listed American solar firms though broader effects on innovation and cost structures will unfold over time.