Trump sets polysilicon import floor and 15% tariff under Section 232

President Donald Trump signed a Section 232 trade action on August 6 that will impose a 15% tariff on imported polysilicon and derivative products from December 4, 2026 while setting minimum import prices across the solar supply chain and requiring rising levels of domestic content in U.S. manufacturing. The proclamation covers downstream polysilicon derivatives including ingots, wafers, cells and modules. It sets import floors of $21 per kilogram for polysilicon, $100 per kilogram for ingots and wafers, $0.22 per watt for solar cells and $0.38 per watt for finished modules. Manufacturers must meet a 50% domestic content threshold by 2026, rising to 80% by 2029. The administration framed China's dominance of the solar supply chain as a national security threat and cast the policy as an effort to rebuild a domestic manufacturing base that has largely disappeared over the past two decades. The U.S. currently accounts for less than 2% of global polysilicon production, down from roughly half of world capacity in 2005, while China controls more than 90% of global output. The move builds on earlier U.S. anti-dumping and countervailing duty actions dating back to 2012, which were extended and modified through 2024 but did not stop Chinese manufacturers from shifting production through Southeast Asia. Domestic producers including T1 Energy, First Solar and Qcells have backed the new measures. Analysts and industry observers say the gap between the August announcement and the December 4, 2026 enforcement date could encourage importers to stockpile panels before the tariffs take effect, potentially creating a temporary glut followed by higher prices once the measures bite.