German solar-panel manufacturer Solarworld (SWV.FRA) expects the European Union to impose anti-dumping tariffs as early as May, Bloomberg reported. The company led a group action last year against Chinese energy firms for what they claimed was unfair competition. EU regulators may introduce initial anti-dumping duties on Chinese solar goods on May 1 or June 1, Frank Asbeck, CEO of Solarworld said on Thursday in an interview. He expected the market to be challenging until what he called unfair trade practices were ironed out in Europe. Solarworld will prioritize the US and Japanese markets, where demand for more efficient panels is increasing, he said. The firm will not sell its solar panels in China due to “unfair market entry conditions,” he said. The forecast EU move is in response to a July complaint from 25 European solar firms organized by Solarworld. Shares in the company increased the most in more than a year in Frankfurt.