Proposed U.S. tariffs on wind-energytowers from China and Vietnam were welcomed by a trade group that had complained competitors were dumping products in the American market.

The Commerce Department concluded in preliminary findings yesterday that producers in the nations, which exported $301 million in towers to the U.S. in 2011, sold the utility-scale goods below production costs. The department, which set duties as high as 73 percent for Chinese products and 60 percent for goods from Vietnam, acted on a complaint by U.S. companies such as Broadwind Energy Inc. (BWEN) of Naperville, Illinois. Broadwind rose 13 percent in trading yesterday.

“Commerce has taken an important step to address the significant dumping that is taking place,” Alan Price, an attorney with Wiley Rein LLP in Washington who represents the U.S. group, said in a statement. Duties will help to “force the Chinese and Vietnamese producers to compete fairly.”