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

The new duties raise the cost of a critical input for solar panels and semiconductors at a moment when the United States is racing to expand domestic manufacturing capacity in both sectors. Domestic producers stand to gain protection from lower-priced imports, yet buyers of panels and chips face the prospect of higher prices once the measures take hold.

President Trump signed the proclamation on Thursday under Section 232 of the Trade Expansion Act of 1962, citing advice from Commerce Secretary Howard Lutnick. The order places a 15 percent tariff on imported polysilicon products and establishes minimum import prices of $21 per kilogram for polysilicon, $100 per kilogram for ingots and wafers, $0.22 per watt for solar cells, and $0.38 per watt for modules. The changes become effective December 4. The administration framed the steps as necessary to ensure the commercial viability of U.S. polysilicon production for economic and national security reasons.

Two U.S. facilities currently produce the material: Hemlock Semiconductor in Michigan, a joint venture involving Corning and Japan’s Shin-Etsu Handotai, and a Wacker Chemie plant in Tennessee. Corning welcomed the move as support for continued investment. Wacker said it was reviewing the details while noting the importance of supply-chain resilience for semiconductors and defense. T1 Energy, First Solar, and Qcells also issued statements of support. Trade attorney Tim Brightbill warned that the three-month delay could prompt a surge in imports before the rules apply.

China’s Foreign Ministry responded by accusing the United States of overstretching national-security concepts and disrupting normal trade. Spokesperson Lin Jian stated that protectionism would not improve U.S. competitiveness and that China would defend its companies’ interests. The Semiconductor Industry Association has reported that chips account for 2.4 percent of global polysilicon demand, underscoring the material’s dual-use role in artificial-intelligence hardware and solar manufacturing.