Commerce Caps New Solar Importers at 12 kg of Polysilicon a Week Until December 4
- FERC & Federal Policy & Markets Regulatory
Marin Holt
- 0
- 7 minutes read
- Weekly polysilicon cap, new importers: 12 kilograms
- Weekly doped-wafer cap: 7 kilograms
- Weekly cap, cells not in modules: 2,000 units
- Section 232 duties effective: December 4, 2026
Commerce moved on September 22 to stop a pre-tariff buying spree. Its Bureau of Industry and Security issued a temporary final rule capping how much polysilicon and solar hardware a newly registered importer brings in before Section 232 duties start December 4, 2026. Register with Customs and Border Protection on or after August 6, 2026 and you get a weekly ceiling: 12 kilograms of polysilicon, 7 kilograms of doped silicon wafers. Anything landing after December 4 draws a 15% tariff, plus minimum import prices. The rule runs from September 22, 2026 to December 3, 2026.
The ceilings are keyed to tariff codes. Polysilicon under HTSUS 2804.61.00 stops at 12 kilograms. Doped wafers, spread across five 3818.00.00 subheadings, stop at 7 kilograms. Cells not yet assembled into modules, HTSUS 8541.42.00, stop at 2,000 units. The assembled-module line, HTSUS 8541.43.00, stops at 55. Read those figures again. They are small enough to halt a commercial shipment outright, not merely slow it.
Before and after
Proclamation 11052, signed August 6, 2026, had already told the Commerce Secretary to restrict imports by any company found stockpiling ahead of the December adjustments. What it never supplied was a test. This rule supplies one. Commerce weighs an importer’s current volumes against its own weekly averages from 2025 and from January through August 2026. Run substantially above that history and the entries stop, with no covered product admitted before December 4.
The fixed caps exist because a baseline test alone would not bite. A company incorporated last month has no history to exceed, so a purely historical yardstick would leave new entities free to load up. Commerce wrote flat weekly numbers for them instead.
Why It Matters
Developers buying modules for 2027 construction have a contract to reread. Who is the importer of record? That party absorbs the prohibition risk, not the buyer. Where the importer of record is an entity formed for one project, the weekly caps bite, and a procurement plan resting on pre-December delivery stops working.
Critical Perspective
Landing after December 4 costs a 15% tariff, and until then a newly registered importer gets 12 kilograms of polysilicon a week. The half of the rule that binds real volume carries no published number, because established importers face only a test against their own 2025 and early-2026 averages. Commerce spent 2026 setting solar trade policy case by case, finalizing duties on India, Indonesia and Laos, and Customs and Border Protection must now spot a surge in real time. If substantially greater is never quantified before December 4, who decides which importer crossed the line?
Enforcement Reality
Customs brokers are exposed too. Helping an importer evade the limits invites CBP enforcement, reaching broker penalties or proceedings to revoke or suspend a license. That is unusual. It puts the licensed intermediary at risk on every questionable entry, not just the company whose name is on the cargo.
Waivers run through one channel. An applicant emails Commerce at the address named in the rule, documents that scheduled volumes rest on legitimate commercial grounds rather than stockpiling, and commits in binding terms not to stockpile. Commerce intends to answer within 14 days. Against a December 4 wall, 14 days is tight, because a refusal late in the window leaves no time to reroute a shipment.
Domestic manufacturers welcomed it. Hanwha Qcells global chief executive Andy Park cast the pre-policy surge as an old play. “Flooding the U.S. market with large volumes of imported products is a strategy that companies abroad have long used to undermine American manufacturers,” Park said. Clean energy trade groups read the same rule differently, warning that Section 232 duties stacked on minimum import prices and existing trade cases will raise project costs and squeeze cell supply for domestic module assemblers.
One door stays open. Commerce keeps authority to grant relief to manufacturers that submit verified plans to build, refurbish or expand solar production inside the United States.
Sources
- https://www.govinfo.gov/content/pkg/FR-2026-09-24/html/2026-19537.htm
- https://pv-magazine-usa.com/2026/09/28/commerce-restricts-pre-tariff-solar-stockpiling-ahead-of-december-4-deadline/
- https://www.pv-tech.org/us-introduces-polysilicon-import-limits-section-232-tariffs-december/
