President Trump Signs Proclamation Imposing 15% Tariff and Price Floors on Solar and Chip Materials

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On August 7, 2026, United States President Donald Trump signed a national security presidential proclamation imposing a 15 percent ad valorem tariff and establishing mandatory minimum import price floors on polysilicon and its derivative products. The executive trade order, signed in the Oval Office at the White House alongside White House Staff Secretary William Scharf, Deputy Chief of Staff Stephen Miller, and Commerce Secretary Howard Lutnick, directly targets foreign imports of polysilicon—an ultra-pure form of silicon that serves as the essential raw material underpinning solar photovoltaic panels and artificial intelligence semiconductor microchips. The White House officially confirmed that the new trade measures will take effect at 12:01 a.m. on December 4, 2026. Under the explicit provisions of the presidential proclamation, the Trump administration instituted enforceable import price floors across the full polysilicon manufacturing supply chain. The mandatory minimum import prices are established at $21 per kilogram for raw polysilicon, $100 per kilogram for polysilicon ingots and wafers, $0.22 per watt for solar photovoltaic cells, and $0.38 per watt for fully assembled solar modules. In addition to these minimum import price thresholds, importers must pay a 15 percent ad valorem duty on all derivative shipments entering United States ports. President Trump executed the trade action under Section 232 of the Trade Expansion Act of 1962, a federal statute granting presidential authority to adjust imports determined to impair national security. Explaining the rationale during the Oval Office signing, Commerce Secretary Howard Lutnick stated that polysilicon is a foundational material necessary for manufacturing silicon wafers that power AI processors and data center servers. White House Staff Secretary William Scharf affirmed that the proclamation is designed to protect American producers against predatory foreign dumping, onshore vital industrial manufacturing capacity, and safeguard domestic energy infrastructure. Official White House statements noted that the United States currently operates only two primary polysilicon manufacturing plants, leaving domestic technology firms and power grid developers heavily dependent on foreign supply chains. The announcement prompted immediate reactions across international financial markets and foreign governments. In Asian equity trading on Friday, shares of non-Chinese polysilicon manufacturers rallied, with South Korea’s Hanwha Solutions Corporation and OCI Holdings Company posting substantial gains as analysts projected higher profit margins for non-Chinese solar producers. Meanwhile, China’s Ministry of Foreign Affairs issued an official statement opposing the measures. Foreign Ministry spokesperson Lin Jian stated that Washington is overstretching the concept of national security and abusing executive state authority to target foreign enterprises, asserting that the trade policy will increase costs for American consumers and disrupt global economic stability. The new trade restrictions arrive at a sensitive period for the United States economy, as high interest rates and elevated inflation continue to impact consumer budgets and business investment. Industry analysts noted that minimum price floors could elevate capital expenditures for domestic solar project developers and semiconductor supply chains. However, administration officials confirmed that the Department of Commerce will simultaneously implement a specialized investment program to encourage domestic polysilicon factory expansion across the country.