The U.S. imports most of its solar panels. A new ruling may make that more expensive

Workers install solar panels on a rooftop at AltaSea’s research and development facility at the Port of Los Angeles on April 21, 2023. The Department of Commerce has determined that solar panel manufacturers in four Southeast Asian countries are evading U.S. trade rules by using Chinese-sourced materials subject to tariffs without paying applicable duties. Those countries — Vietnam, Malaysia, Thailand, and Cambodia — are responsible for nearly three-quarters of solar modules imported to the United States.

The ruling, unveiled Friday, means that new U.S. solar projects may soon be more expensive: manufacturers whose goods run afoul of Obama-era solar tariffs […]

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