Chinese wind turbines  manufacturers pledged on Friday to actively challenge a US investigation that could lead to crippling import duties on more than $100 million worth of wind-energy towers from China and Vietnam.
The pledge came after the US Commerce Department announced on Thursday that it was launching anti-dumping and countervailing duty investigations on utility-scale wind towers from the two countries.
The items covered by the investigation are the steel towers that support the engines and rotor blades used in wind turbines with electrical power-generation capacities in excess of 100 kilowatts, said the Commerce Department in a statement.
It alleged China had a dumping margin of 213.54 percent in windmill generator -tower prices.
The decision adds to recent friction in the clean-energy trade between the world’s two largest economies.
The Commerce Department is already investigating charges that Chinese solar-panel makers engage in unfair trade practices.
The Wind Tower Trade Coalition (WTTC), a group of US wind-tower manufacturers, filed the complaints with the US Commerce Department and the International Trade Commission (ITC), saying that companies from the two countries are dumping wind turbine generator towers at prices lower than the US market cost.
The WTTC had previously said it was asking for anti-dumping duties of 64 percent on imports from China and 59 percent from Vietnam.
But in its announcement, the Commerce Department said China is alleged to have undercut US wind-tower prices by nearly 214 percent and Vietnam by 141 to 143 percent.

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