The US government is cancelling tariff exemptions for certain solar imports. The latest step is aimed primarily at China, an economic rival and the second-largest economy behind the United States. The White House said loopholes for imports via third countries were being closed and that tariff exemptions for bifacial, or double-sided, solar modules were coming to an end. Bifacial models can not only convert solar radiation from above into electricity, but also absorb reflected radiation via the back. “These actions will provide a boost to domestic solar producers, but the impact of Chinese over…