The U.S. Commerce Department announced on Monday, April 21, the imposition of new tariffs on solar panel imports from four Southeast Asian countries. This marks the conclusion of a yearlong investigation into alleged unfair trade practices in the renewable energy sector.
Which countries will be impacted by these solar tariffs?
Solar manufacturers in Cambodia, Vietnam, Malaysia and Thailand will now face antidumping and countervailing duties, with rates reaching as high as 3,521%. Cambodia received the highest penalties after reportedly failing to cooperate with the investigation.

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The probe, initiated in 2024 during the Biden administration, which itself followed a petition from the American Alliance for Solar Manufacturing, found that companies based in these countries had benefited from government subsidies, allowing them to sell solar components in the U.S. at prices below production costs.
How are American solar manufacturers responding?
Legal counsel for the American Alliance for Solar Manufacturing has voiced support for the increased tariffs, calling the move a “decisive victory for American manufacturing.” The organization also claimed Chinese-headquartered firms were using Southeast Asian facilities to avoid earlier U.S. trade restrictions.
What could this mean for US solar projects?
This move could present challenges for U.S. developers who rely heavily on cheaper imported solar components. Nearly 77% of solar modules imported into the U.S. last year originated from the four nations now affected by the tariffs, according to BloombergNEF. Industry analysts caution the raised duties may drive up project costs and delay timelines for clean energy initiatives.
What happens next?
Before the tariffs can be fully enacted, the U.S. International Trade Commission must vote in June on whether domestic manufacturers were indeed materially harmed by the imports.
Meanwhile, impacted foreign solar companies are reportedly considering strategies to mitigate the effects of the new duties, including shifting operations to other countries not targeted by the tariffs, such as Indonesia and Laos.