Key Highlights

  • The Trump administration is expected to announce a 15% tariff and a series of price floors on polysilicon products as soon as Thursday, according to four sources familiar with the matter.
  • The proclamation is expected to include minimum import prices on polysilicon, wafers, cells, and solar panels, alongside the 15% tariff on polysilicon derivatives.
  • The move follows a year-long national security investigation into polysilicon conducted by the Commerce Department and aims to protect U.S. polysilicon factories, including those owned by Hemlock Semiconductor and Wacker Chemie, from growing Chinese competition.
  • The chip industry accounts for only 2.4% of global polysilicon demand, according to the Semiconductor Industry Association, with the material used far more heavily in solar panel manufacturing.

Hybrid Tariff and Price Floor System Expected as Soon as Thursday

The Trump administration will announce as soon as Thursday a 15% tariff and a series of price floors on products made from polysilicon, the key raw material used in solar panels and semiconductors, according to four sources familiar with the matter. The proclamation by President Trump is expected to include minimum import prices on polysilicon, wafers, cells, and modules, or solar panels, in addition to the 15% tariff on polysilicon derivatives. The administration's plan to combine a minimum import price with tariffs reflects a hybrid approach aimed at protecting domestic polysilicon manufacturing capacity.

Investigation Targets Growing Chinese Ambitions in Chip Supply Chain

The move stems from a year-long national security investigation into polysilicon conducted by the Commerce Department, which also carries significant implications for the growing domestic solar manufacturing industry at a time when the administration has scaled back federal support for renewable energy. The tariff and price floor system is intended to protect U.S. polysilicon factories, including those owned by Hemlock Semiconductor and Wacker Chemie, from growing Chinese competition in the broader chip supply chain. Polysilicon sits at the start of both the semiconductor and solar manufacturing supply chains, with manufacturers converting silicon wafers into solar cells before assembling them into panels.

Solar Demand for Polysilicon Far Exceeds Chip Industry's Share

While the investigation is framed around semiconductor supply chain security, the chip industry accounts for only 2.4% of global polysilicon demand, according to the Semiconductor Industry Association, with the solar industry representing the far larger source of demand for the material. Domestic semiconductor manufacturing, a stated priority for the administration, depends in part on the solar industry's larger polysilicon demand to help support production of the material required for chips. The Commerce Department and the White House did not immediately respond to requests for comment on the planned announcement.

Conclusion

The planned polysilicon tariff and price floor system reflects the Trump administration's broader effort to secure domestic supply chains for materials considered critical to both semiconductor and solar panel manufacturing amid growing Chinese competition. The policy's framing around national security and chip supply chains contrasts with the reality that solar manufacturing accounts for the overwhelming majority of global polysilicon demand, illustrating the interconnected nature of the two industries. How domestic manufacturers and downstream solar and semiconductor companies respond to the new pricing structure may become clearer once the formal proclamation is issued.