The United States is set to impose tariffs of up to 3,521% on solar panels imported via a small number of Southeast Asian nations.

U.S. trade officials finalized steep tariff levels on most solar cells from Southeast Asia, a key step toward wrapping up a year-old trade case in which American manufacturers accused Chinese companies of flooding the market with unfairly cheap goods.

China is accused of paying Southeast Asian companies to sell solar panels below manufacturing costs to hurt US companies.