German solar company SolarWorld AG (SWV.XE) said Thursday it plans to complain over what it calls unfair competition from China in the European Union.

"We are currently preparing a proceeding," Chief Executive Officer Frank Asbeck told Dow Jones Newswires. He declined to reveal when the complaint will be filed and which other companies will participate.

Wednesday, SolarWold said it has filed a petition with six other companies to the U.S. Department of Commerce and the International Trade Commission alleging that Chinese manufacturers have been dumping solar panels on the
U.S. market and received illegal subsidies from the Chinese government, which has injured U.S. manufacturers.

European and
U.S. solar companies have been struggling for years with increasing competition and cheap imports from China . Pricing pressure has further intensified this year. German companies like Q-Cells SE (QCE.XE) and Solon are fighting for survival and in the U.S. , Solyndra LLC's collapse attracted much attention.