The U.S. Department of Commerce has issued final affirmative determinations in its antidumping and countervailing duty investigations targeting crystalline silicon photovoltaic cells and modules imported from India, Indonesia, and Laos.

Commerce reported a finding that manufacturers in all three nations dumped solar components into the U.S. market below fair value and benefited from government subsidies, resulting in material injury to the domestic solar manufacturing sector. The decision marks the conclusion of the Department of Commerce phase of the Solar IV trade litigation, originally brought by the Alliance for American Solar Manufacturing and Trade. Find an International Trade Administration fact sheet here.

In its final determination, Commerce established steep dumping margins and countervailing subsidy rates across mandatory respondents and all other producers in the targeted nations.

For Indian suppliers, Commerce calculated final dumping margins at 123.04% for all producers, alongside a countervailing duty rate set at 126.09%. Indonesian exporters face finalized dumping margins at 94.36% for all producers, with final countervailing duty rates ranging between 73.2% and 173.7%, depending on the specific manufacturer. For imports originating in Laos, Commerce set final dumping margins at 65.43% for all exporters, accompanied by countervailing subsidy rates established between 82.03% and 153.67%.

Unlike broader statutory actions like reciprocal tariffs or Section 232 national security measures, the trade measures are case-specific orders under the Tariff Act of 1930. The final antidumping and countervailing duties will stack directly on top of existing executive tariffs rather than replacing them.

The cases were initiated following petitions from the Alliance for American Solar Manufacturing and Trade, a coalition represented by lead petitioners First Solar, Hanwha Qcells USA, and Mission Solar Energy.

“America’s solar manufacturing sector is poised for a historic resurgence, with domestic module capacity up more than 750% since 2022 and cell production expanding as well,” said Tim Brightbill, co-chair of Wiley’s International Trade Practice and lead counsel to the Alliance. “But that progress is being harmed by dumped and subsidized imports from India, Indonesia, and Laos that have denied American producers a level playing field. Today’s final determinations are an essential step toward enforcing our trade laws and restoring fair competition for U.S. solar manufacturers and the workers they employ.”

Market context

While the Solar IV cases conclude, the market reality on the ground has already shifted. Cell procurement for U.S. module assembly has largely migrated away from the target nations, with primary cell volumes now originating in South Korea, the Philippines, and emerging African manufacturing hubs including Kenya, Nigeria, and Ethiopia. Meanwhile, South Korean cell suppliers face their own trade headwinds following a separate trade petition filed by the coalition American Manufacturers for Energy Resilience.

These finalized duties also arrive alongside structural administrative changes reshaping solar procurement. Federal trade rules recently established Section 232 minimum import price floors across the supply chain, setting statutory minimum entry prices of $21 per kilogram for raw polysilicon, $100 per kilogram for ingots and wafers, $0.22 per watt for solar cells, and $0.38 per watt for modules.

With government-mandated price floors governing imported components, industry observers note that the legal foundation for future antidumping and countervailing duty cases may lessen significantly. Because minimum import prices administratively dictate the baseline cost of foreign solar goods, proving that domestic manufacturers suffer material injury from unfair undercutting or dumped pricing becomes substantially harder to substantiate under U.S. trade law standards.

Next steps

The determination follows the U.S. International Trade Commission final hearing held earlier this week. The proceedings now turn to the Commission for its final injury vote, scheduled for October 14, 2026, to determine whether dumped and subsidized imports from the three nations materially injure or threaten the U.S. solar manufacturing industry.

If the International Trade Commission vote is affirmative, Commerce will issue official duty orders on November 2, 2026, imposing the finalized cash deposit rates. If the panel finds no material injury, the proceedings will terminate and all cash deposits previously collected by U.S. Customs and Border Protection will be refunded.

The Solar IV cases follow the implementation of Solar III duty orders in June 2025 targeting imports from Cambodia, Malaysia, Thailand, and Vietnam, which saw shipments from those four nations fall from $12.2 billion in 2023 to $1.3 billion in 2025.