Trina Solar, the fourth largest manufacturer by 2011 module production, was singled out for a higher duty of 4.73%, while Suntech Power, the No. 2 player according to Lux Research, will face a lower duty of 2.9%. All other Chinese producers face the 3.61% rate.

The DOC finds that the duties are warranted to counteract unfair subsidies provided by the Chinese government to its solar industry in what has been called the largest single trade dispute between the two nations.