May 31, 2012. The U.S. Commerce Department set duties from 13.74 percent to 26 percent on imports of wind towers from China used by the energy industry, siding with U.S. manufacturers including Broadwind Energy Inc. The agency released preliminary results of its investigation into a complaint from the Wind Tower Trade Coalition, which claims its members are harmed by subsidies on products from China. In addition to Broadwind of Naperville, Illinois, the group includes Otter Tail Corp.'s DMI Industries, Katana Summit LLC and a unit of Trinity Industries Inc.