Chinese companies, however, are not the only ones to decry SolarWorld's petition for more tariffs. A U.S.-based organization called Coalition for Affordable Solar Energy (CASE) sprang up in opposition to SolarWorld. The group comprises more than 90 companies "united in the belief that SolarWorld's actions will kill jobs in the U.S. economy while raising the price of solar energy," according to its website.
Many of those companies will suffer with tariffs on Chinese manufacturers, George Hershman, a division manager for CASE-member Swinerton Renewable Energy, told CNBC last month. He said his group does not support a legal petition on Chinese trade practices when other steps could be taken that won't damage other sectors of the U.S. solar economy.
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"We just think that handling this through the Department of Commerce is a broad-reaching approach to an issue," he told CNBC. "The industry ... recognizes that a settlement is a better solution."
Click here for more on the SolarWorld-CASE disagreement.
CASE released a statement on Wednesday saying it is "deeply disappointed" in the Commerce Department's ruling.
—By CNBC's Everett Rosenfeld, with reporting by Reuters