PIPESTONE, Minn. — Finishing the 20-story climb up a ladder inside a wind-turbine tower, Scott Rowland opened the top hatch to reveal a panorama of flat farmland dotted with dozens of other turbines.

Two of the closest, like the tower he was standing on here, were built by Goldwind USA, where Mr. Rowland is vice president for engineering. “These are very sophisticated machines,” he said.

They are also the only three Chinese-made wind turbines operating in the United States.

That could soon change, though, as Goldwind and other Chinese-owned companies plan a big push into the American wind power market in coming months.

While proponents say the Chinese manufacturers should be welcomed as an engine for creating more green jobs and speeding the adoption of renewable energy in this country, others see a threat to workers and profits in the still-embryonic American wind industry.

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