U.S. President Donald Trump signed an executive order on August 6 imposing a 15% tariff on imported polysilicon and related products, along with minimum import price floors aimed at protecting domestic manufacturers from foreign competition. The measures, issued under Section 232 of the Trade Expansion Act of 1962, will take effect on December 4, 2025, according to a White House statement.
The order establishes price floors of $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. Additionally, the Commerce Department will develop an incentive program to support domestic production of polysilicon and its derivatives.
Stock market reaction saw gains in U.S. solar companies ahead of trading. First Solar’s stock rose over 7%, while Solaredge Technologies gained 1%, and the Invesco Solar ETF increased by 4% in premarket trading.
Rationale and enforcement
The White House framed the measures as necessary to counter foreign dumping and protect domestic supply chains in critical industries. Commerce Secretary Howard Lutnick stated the policy aims to prevent Chinese imports from undercutting U.S. producers and to encourage domestic manufacturing. "We’re setting prices so that the Chinese can’t dump anymore, and we’re setting tariffs to say build it here," Lutnick said during a briefing.
The executive order follows a July 2025 Commerce Department investigation under Section 232, which assessed whether polysilicon imports posed a threat to U.S. national security. The investigation concluded that domestic production required protection to ensure supply chain resilience in semiconductors and solar energy sectors.
Industry and policy implications
Polysilicon, a highly purified form of silicon, is a foundational material for solar panels and semiconductor chips. The U.S. has sought to reduce reliance on foreign suppliers, particularly from China, which dominates global polysilicon production. The new measures aim to strengthen domestic manufacturing capacity and reduce vulnerabilities in critical supply chains.
The White House emphasized that the policy combines tariffs and price floors to create a protected domestic market that allows U.S. producers to compete without distortions from foreign subsidies or dumping practices. The incentive program for domestic factories is intended to accelerate investment in polysilicon production and related industries.
Timeline and implementation
The tariffs and price floors will be enforced starting December 4, 2025, giving importers and domestic producers a 120-day transition period to adjust to the new rules. The Commerce Department will oversee compliance and may adjust enforcement mechanisms as needed.
The executive order does not specify exemptions for existing contracts or long-term supply agreements, leaving potential implications for international trade partners unclear. The policy’s long-term impact on solar energy costs and semiconductor manufacturing remains to be seen, as industry stakeholders assess the balance between protectionism and market stability.