Workers check photovoltaic panels before packing at the New Material 800MW high-efficiency photovoltaic module production line in Zhangye city, Gansu province, China, April 16, 2024.A coalition of U.S. solar manufacturers petitioned the federal government on Wednesday to impose tariffs on imports from four Southeast Asian nations, alleging that the countries are flooding the U.S. market with cheap products that threaten the domestic industry.First Solar and six other manufacturers allege that companies in C ...