Customs Will Permanently Bar an Importer and Its Affiliates Over a Misstated Solar Price

President Trump signed Proclamation 11052 on August 6, 2026, published in the Federal Register on August 11 at 91 FR 51975. It sets four minimum import prices: $21 per kilogram for polysilicon, $100 per kilogram for polysilicon ingots and wafers, $0.22 per watt for solar cells and $0.38 per watt for solar modules. The prices bind on goods entered for consumption, or withdrawn from warehouse for consumption, on or after 12:01 a.m. eastern time on December 4, 2026. A separate 15 percent ad valorem duty on polysilicon ingots and the derivative products in Annexes I and II starts on the same date, on top of any other duties, taxes and charges.

The mechanism is where the file gets unusual. Under clause 2(a), Customs and Border Protection will permit an importer to submit documentation at entry establishing or certifying either that any first arm's-length sale of the imported merchandise in the United States will occur at or above the applicable minimum, or that the sale is pursuant to fixed terms in a contract entered into before August 6, 2026. The certification explicitly extends to downstream products made from that merchandise. An importer that files nothing pays a specific tariff equal to the whole minimum import price. An importer that files documentation but enters at a value below the minimum pays the difference.

That moves the compliance risk on imported solar inputs off the customs value and onto the plant's own future pricing, and clause 3 prices the risk at the loss of the business. If CBP determines that an importer's documentation was materially inaccurate, or that the importer materially failed to comply with its certification, that importer and its affiliates are permanently prohibited from importing polysilicon and polysilicon derivatives into the United States. CBP may add penalties. There is no cure period in the text, no de minimis, and no stated appeal.

The proclamation's own findings explain who is exposed. The Secretary of Commerce found that the United States share of global polysilicon production capacity fell from 50 percent in 2005 to less than 2 percent in 2024, that its share of global semiconductor wafer fabrication capacity fell from 37 percent in 1990 to 10 percent in 2024, and that in the solar sector the United States is virtually entirely dependent on imports of solar ingots, wafers and cells. Those imports are the input stream for the cell and module plants that state and regional agencies have been recruiting.

Three plants show the range. Qcells started cell production at Cartersville, Georgia in June 2026 at what the company calls America's first and only vertically integrated solar factory, running toward 3.3 GW each of ingot, wafer and cell capacity and 3.5 GW of modules with all lines at full rate in the third quarter of 2026. A plant that makes its own ingots and wafers has the least to certify. At the other end, Heliene's Minnesota module lines are being fed by Suniva cells cut from Corning wafers made in Michigan from Hemlock Semiconductor polysilicon, a chain assembled after NorSun told Heliene that its $620 million, 5 GW ingot and wafer plant at the Mingo Development Area near Tulsa was not proceeding. Oklahoma lost the wafer plant; Michigan holds the only wafer factory to come online in the United States in more than a decade. REC Silicon halted polysilicon production at Butte, Montana in February 2024 and shut Moses Lake, Washington with 224 job cuts beginning January 16, 2025, which is why the domestic polysilicon that would take a buyer outside the certification entirely is scarce.

The relief routes are narrower than they look. Products subject to these duties admitted to a foreign trade zone on or after the effective date may be admitted only under privileged foreign status, which fixes the rate at admission and removes zone processing as a way to reduce it. Manufacturing drawback under 19 U.S.C. 1313(a) and (b) survives only where the article is not of a type subject to an antidumping or countervailing duty order, is a product of a Trade Agreement Partner, and, critically, where the polysilicon content of the article is composed entirely of polysilicon from a Trade Agreement Partner country. The partner list is the United Kingdom, the European Union, Japan, Korea, Switzerland, Liechtenstein, Mexico, Canada and any trading partner that concludes a trade and security agreement. Products of Japan, Korea, Taiwan, Switzerland, Liechtenstein and European Union members carry an all-in ceiling of 15 percent covering the Section 232 duty and the Column 1 rate together, and United Kingdom products carry 10 percent.

The onshoring program is the one route that removes the duty rather than reducing it. Commerce may accept plans committing a company to build, refurbish or expand a United States facility producing polysilicon, ingots, wafers or cells, with construction starting by January 20, 2029, and may then let that company import production equipment and covered products duty free in volumes it deems commensurate with the committed investment. The published criteria are discretionary: anticipated construction start date, whether the timeline and milestones are commercially reasonable, anticipated annual output, whether costs and production projections are reasonable, and how the benefit of the reduced rate will be allocated between the applicants. Commerce has not published an application, a form, a deadline or a decision clock.

The strongest objection is that none of this is new pressure. The proclamation itself says the 15 percent duty replaces the narrower safeguard on solar cells and modules that expired in February 2026, so cell and module imports were already taxed and the domestic industry asked for the successor. That is correct. It is also beside the point of the new instrument. The expired safeguard was a rate applied at the border on two product categories. The minimum import price is a certification about a future domestic transaction, it reaches ingots and wafers the safeguard never touched, and its enforcement remedy is exclusion from the market rather than a higher rate.

Pulling volume forward is not a safe answer either. Clause 11 directs the Secretary to monitor imports and, on finding that a company is stockpiling polysilicon or derivatives before December 4, to act with CBP to restrict imports by that company and its affiliates.