By Workers install solar panels on a rooftop at AltaSea's research and development facility at the Port of Los Angeles on April 21, 2023. Paul Sancya/AP The investigation upended the solar industry, until Biden stepped inThe Commerce Department's investigation began in March 2022 in response to a complaint from a small U. But once Biden's tariff waiver expires in June 2024, costs could go up, stalling growth in the solar power industry