Signal Trump signs proclamation imposing Section 232 tariffs and minimum import prices on polysilicon

Summary

President Trump signed a proclamation on 2026-08-06 imposing tariffs on polysilicon and its derivative products under Section 232 of the Trade Expansion Act of 1962. The proclamation imposes a 15% ad valorem tariff on downstream derivative products such as ingots, wafers, solar cells and solar modules. It also establishes minimum import prices (MIP) 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 solar modules, aimed at blocking low-priced imports. The remedies take effect 120 days after signing, on 2026-12-04. The proclamation additionally authorizes the Secretary of Commerce to establish an incentive program supporting companies that invest in domestic polysilicon production facilities.