Trump Sets 15% Polysilicon Tariff and Import Price Floors Effective December 4

The White House said President Donald Trump signed a proclamation on August 6, 2026, imposing duties and import price floors on polysilicon products. The floor for imported solar modules is 38 cents per watt, against a U.S. median of 27.1 cents per watt in Anza Renewables data. The administration grounded the action in semiconductor national security, and the proclamation's findings say chip-grade polysilicon production depends on the larger volume of demand from solar.

The import floor

The proclamation adds a 15 percent ad valorem duty on polysilicon derivatives. Its minimum import prices are $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 rules take effect at 12:01 a.m. Eastern on December 4, 2026.

Importers must certify either that the first arm's-length U.S. sale will occur at or above the floor or that the sale is pursuant to fixed terms in a contract entered into before the proclamation was signed. Without documentation, goods carry a tariff equal to the full floor; when entered value is lower, the importer pays the difference. Customs and Border Protection can permanently bar a noncompliant importer and its affiliates.

Commerce found that the U.S. share of global polysilicon capacity fell from 50 percent in 2005 to less than 2 percent in 2024. Global production grew more than 270 percent since 2020, while inventories reached a record 400,000 tons at the end of 2024. The August 6 proclamation put semiconductor-grade material at only 2.4 percent of global polysilicon production.

Solar pricing

Modules shipping to the U.S. cost 27 cents per watt, against a global average of 11 cents, according to BloombergNEF data. The U.S. median was 27.1 cents per watt in Anza Renewables data, making the floor about 40 percent higher, while domestic modules using domestic cells cost 47 cents per watt. BloombergNEF data also show that solar remains among the cheapest options for electricity in the U.S.

Roth Capital Partners projected that directly imported finished modules would rise from $0.24 per watt before the action to $0.38 afterward. To fully offset the additional capital expenditure from a roughly $0.10-per-watt average increase, power-purchase agreement rates would need to rise by $4 to $5 per megawatt-hour. If the domestic manufacturing boom fails to materialize, the policy would add about 12 percent to the total cost of a solar system, according to Guggenheim Securities.

Domestic capacity

The U.S. had 10.6 gigawatts of operating solar-cell capacity as of summer 2026, according to the Solar Energy Industries Association. Pavel Molchanov, a cleantech analyst at Raymond James, said, "The U.S. will remain dependent on importing cells, wafers, ingots, and/or raw polysilicon for the foreseeable future," and noted that the floor is nearly five times the global benchmark.

"America has made terrific progress rebuilding its solar manufacturing base, but imposing tariffs and prices floors on solar materials will create new challenges for American manufacturers and raise energy costs for families and businesses," said Tim Pawlenty, the association's chief executive.

The U.S. has two polysilicon plants, according to Reuters: Hemlock Semiconductor in Michigan, a Corning and Shin-Etsu Handotai joint venture, and Wacker Chemie's Tennessee facility. Corning described the decision as one that "encourages continued investment in U.S. capacity and supports long-term U.S. competitiveness." Wacker said it was reviewing the action.

The onshoring path

Commerce may approve company plans that commit construction to start by January 20, 2029. Approved companies can import production equipment and covered products without the Section 232 duty during construction. The proclamation does not say how the commerce secretary will weigh onshoring plans beyond factors he "deems appropriate."

Li Shuo, director of the China Climate Hub at the Asia Society Policy Institute, told Bloomberg: "The US is limiting this source of energy when the country so desperately needs more electricity to scale up high tech and AI."

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Marcus Schuler

San Francisco

Editor-in-Chief and founder of Implicator.ai. Former ARD correspondent and senior broadcast journalist with 10+ years covering tech. Writes daily briefings on policy and market developments. Based in San Francisco. E-mail: editor@implicator.ai