New 15 Percent Polysilicon Duty Hits Texas Manufacturers
Solar energy operators face higher import costs as T1 Energy expands domestic production.
Updated on Oct. 29, 2026 in Manufacturing
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T1 Energy is advancing its Texas solar manufacturing footprint with a 2.1 GW solar cell plant in Rockdale. The project arrives as manufacturers brace for a 15 percent duty on imported polysilicon taking effect in December 2026.
Why it matters
The new facility aims to bolster American grid power and manufacturing employment, even as regional operators face rising input costs due to new federal import duties. Balancing supply chain reliance on foreign components against these tariffs will define margin stability for the sector.
T1 Energy is investing $500 million in the first phase of its Rockdale site, which is projected to create 1,500 jobs with a $120 million payroll. The site covers 100 acres and is designed for an eventual 5 GW module facility capacity.
The players
T1 Energy
An energy manufacturing company focused on scaling domestic solar cell and module production capacity.
President of the United States
The head of the executive branch with authority over trade policy, including the issuance of Section 232 proclamations.
Commerce Department
The federal agency responsible for trade enforcement and the granting of industrial import waivers.
The details
T1 Energy is utilizing a Commerce Department waiver to import 1.725 GW of foreign cells to supply its Dallas-area module plant. This procurement strategy functions as a bridge while the company completes the 2.1 GW domestic cell manufacturing facility in Rockdale. Operators in the energy sector must now navigate the 15 percent duty on polysilicon that applies to all derivative products starting December 4, 2026.
Timeline
December 2025: Construction began on the 100-acre Rockdale plant site.
August 2026: President Trump issued a Section 232 proclamation on polysilicon imports.
October 21, 2026: T1 Energy announced updates regarding the G2_Austin facility.
December 4, 2026: A 15 percent duty on polysilicon and derivative products takes effect.
Early 2027: The plant targets the commencement of first production.
Market Landscape
The 15 percent duty on polysilicon follows the enforcement logic of Section 232 of the Trade Expansion Act, which governs tariffs on materials deemed essential to national security. This move signals a tightening regulatory environment for solar supply chains that rely on international raw material sourcing.
Texas operators must account for the December 4, 2026, duty hike when auditing procurement contracts for silicon-based materials. Evaluating the feasibility of import waivers versus local sourcing is essential for maintaining project margins before production ramps up in 2027.
The takeaway
The rise of domestic manufacturing capacity like the T1 Energy site provides a strategic hedge against fluctuating trade policy. Operators should track the specific implementation of polysilicon duties to adjust their 2027 budget forecasts accordingly.
What happens next
The 15 percent duty on polysilicon and its derivative products takes effect on December 4, 2026.
Further reading
For more insight into regional industrial trends, visit the Manufacturing section.
Source note: This article includes information reported by Breitbart.
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