China will continue anti-dumping duties on solar-grade polysilicon imports from the US and South Korea until 2031
US suppliers will face duties between 53.3% and 57%, while South Korean companies will see rates from 4.4% up to 113.8%
China will also keep countervailing duties on US polysilicon at 0% to 2.1%, unchanged from earlier levels, for another 5 years
The Chinese Ministry of Commerce (MOFCOM) has ruled to extend anti-dumping duties (ADD) on imported solar-grade polysilicon from the US and South Korea. The extension of the tariffs will take effect on January 14, 2026, for a period of 5 years.
This covers rod-shaped, block-shaped, and granular polycrystalline silicon products made from chlorosilane as a raw material, as well as processes such as the Siemens and silane processes for the production of crystalline silicon solar PV cells.
The ADD ranges from 53.3% to 57% for US manufacturers on the list, comprising REC Solar Grade Silicon, REC Advanced Silicon Materials, Hemlock Semiconductor Corporation, MEMC Pasadena, and AE Polysilicon Corporation, among others.
For the South Korean companies on the list, including OCI Co. Ltd., Korea Silicon Co. Ltd. of Hankook Silicon, Hanwha Seishin of Hanwha Solutions, SMP, Woongjin Polysilicon, KCC Corp., Korean Advanced Materials, Innovation Silicon, and others.
The effective ADD range for the South Korean companies is 4.4% to 113.8%, according to the MOFCOM notification.
In addition, MOFCOM separately announced the continuation of countervailing duties (CVD) on solar-grade polysilicon imported from the US for 5 years, effective January 14, 2026. The CVD rates remain unchanged from 2014 when the CVD was initially imposed, within 0% to 2.1%.
China initially imposed ADD on solar-grade polysilicon imports from the US and South Korea on January 20, 2014, for a period of 5 years. Duty rates ranged between 53.3% and 57% for US and 2.4% to 48.7% for South Korean companies. It extended the duties for another 5 years on January 20, 2020.
The ministry launched a fresh investigation to conduct a sunset review of the ADD following applications from the Chinese solar-grade polysilicon industry in January 2025. It concluded that if the antidumping measures were terminated, the dumping of the product in question would continue and would harm the Chinese industry. Hence, it decided to continue with the ADD for another 5 years.
Notably, the US has imposed AD/CVD tariffs on Chinese solar companies shipping their solar cells and modules into the US from Cambodia, Malaysia, Thailand, and Vietnam, citing material injury to the local industry (see USITC Issues Final Injury Determination In AD/CVD Investigation).
Chinese solar cells and module imports also face US tariffs under Section 201, and solar-grade polysilicon, wafers, and cells under Section 301. Chinese solar manufacturing equipment is excluded from Section 301 tariffs until November 10, 2026 (see US Extends Section 301 Tariff Exclusions For Solar PV).