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, the critical raw material behind semiconductors and solar panels. The move takes effect December 4 and targets supply chains long dominated by China.

The order, issued under Section 232 of the Trade Expansion Act, follows warnings that foreign producers have undercut domestic output for years through subsidies and market flooding. Polysilicon sits at the base of both advanced computing and solar manufacturing, and officials argue that continued reliance on Chinese sources threatens American economic security and technological edge in artificial intelligence and energy production.

Two American facilities produce the material. Hemlock Semiconductor operates a plant in Michigan as a joint venture involving Corning and Japan's Shin-Etsu Handotai, while Wacker Chemie runs a factory in Tennessee. Spokesmen for both operations welcomed the policy as encouragement for further domestic investment.

Trump stated that past trade practices had eroded U.S. production capacity and left the country vulnerable. The administration framed the tariff and accompanying minimum price rules as steps to restore commercial viability for American makers and to reduce exposure to a single foreign supplier.

Solar company shares rose in early trading after the announcement. First Solar advanced more than 7 percent, while the Invesco Solar ETF gained 4 percent. Industry observers noted that the measures address long-standing complaints from U.S. solar manufacturers about below-cost imports enabled by Chinese government support.

Beijing responded sharply. A foreign ministry spokesman accused Washington of stretching national security arguments and disrupting legitimate commerce. Chinese officials claimed the tariffs would ultimately harm American businesses and consumers by raising costs.

The United States has maintained only limited polysilicon output despite growing demand for chips and panels. Manufacturers have pointed to repeated instances of Chinese firms shifting production to third countries to skirt earlier duties. The new order seeks to close those gaps and support supply chain resilience at a time when both semiconductors and solar power are viewed as strategic priorities.

Domestic producers say the policy provides clearer market signals for expansion. Without such protections, they argue, continued price pressure from subsidized imports would keep new American capacity offline. The administration has tied the action to broader efforts to counter China's position in critical technologies and manufacturing.

Trade analysts expect the tariff to raise the cost of certain imported solar components and chip materials in the near term. Supporters counter that the long-run effect will be renewed investment in U.S. plants and greater control over supply chains essential to national infrastructure.