The U.S. Department of Commerce has concluded that revoking the prevailing antidumping duty (AD) and countervailing duty (CVD) on crystalline silicon photovoltaic product imports from China and Taiwan will lead to a recurrence of dumping.

Commerce announced its affirmative final determinations in the second expedited sunset review of AD and DVD orders for the two countries issued in 2015.

As a result of the ruling, the existing AD/CVD on the solar products covered under the orders from the two countries will remain in place.

Commerce determined that revoking the existing AD orders would likely lead to the continuation or recurrence of dumping at margins of 165.04% for China and 27.55% for Taiwan. Revoking the CVD order on China would likely result in the continuation or recurrence of countervailable subsidies at rates ranging from 29.72% to 41.57%.

The AD/CVD orders for the two countries were issued in February 2015 after investigations found that the imported products were being sold in the U.S. at less than fair value, causing injury to domestic manufacturers. The first sunset review of these orders was conducted in 2020.

The U.S. move comes close on the heels of China’s decision to extend the imposition of antidumping duties on imported U.S. solar-grade polysilicon for five years, effective January 14, 2026. South Korean imports were also slapped with the duties.

China’s investigation concluded that terminating the prevailing duties could lead to continued polysilicon dumping from the U.S. and South Korea, as well as recurring damage to China’s solar-grade polysilicon industry.

Separately, Commerce last year commenced an investigation to determine the effects of importing polysilicon and its derivatives on the country’s national security. The investigation aimed to assess the potential for export restrictions by foreign nations, including their ability to weaponize their control over polysilicon and its derivatives.

The U.S. did not name any particular country from which polysilicon enters the U.S., although China dominates the global polysilicon supply chain.