The Trump administration is preparing a 15% tariff on polysilicon products, along with a series of price floors, in a move intended to support domestic manufacturers. An announcement could come as soon as Thursday.

Polysilicon is a foundational material for solar panels and semiconductors, making the proposed measures relevant to both clean-energy manufacturing and the technology supply chain. The policy is also framed as an effort to counter competition linked to China.

By raising the cost of imported polysilicon products and setting minimum prices, the administration aims to give U.S. factories greater protection from foreign competition. The announcement is expected to outline how the tariff and price floors will apply.