The US Department of Commerce (DoC) has opened an investigation into imports of polysilicon and its derivatives, citing concerns over domestic production and foreign trade practices.

Initiated earlier this month under Section 232 of the Trade Expansion Act of 1962, the probe will assess the impact of polysilicon imports on the US market, including their effects on domestic manufacturing and the role of global supply chains in meeting domestic demand.

A Federal Register notice, set for publication on Wednesday (16 July 2025), confirms that the DoC will accept public comments for 21 days following the notice’s release. Key areas of interest include:

The feasibility of expanding US production to reduce reliance on imports.

The influence of foreign government subsidies and predatory trade practices on the competitiveness of polysilicon in the US.

The economic consequences of artificially low prices caused by foreign overproduction and unfair trade policies.

This move follows recent US trade actions targeting polysilicon. In December 2024, the Office of the US Trade Representative (USTR) raised tariffs on Chinese polysilicon and solar wafers from 25% to 50% under Section 301, with the hike taking effect at the start of 2025.

The new investigation signals continued scrutiny of global polysilicon trade dynamics, particularly as the US seeks to bolster its domestic clean energy supply chain.