Four wind companies that manufacture steel filed a trade complaint with the Department of Commerce and the U.S. International Trade Commission last week against China and Vietnam, contending that the two nations are providing unfair subsidies that hurt the domestic industry. The compliant, similar to that made by several solar firms in October, stems from the fact that much of the price of wind turbines comes from the steel used in the towers, which can weigh 350 tons and cost more than $600,000. The department and commission are expected to initiate AD and CVD investigations within the next few weeks, with a preliminary injury determination from the ITC in February and determinations from Commerce within the next six months; a final determination is due in nine to 13 months.