South African energy giant Sasol Ltd. said Wednesday it was shelving an $11 billion project on Louisiana’s Gulf Coast, imperiling one of the largest foreign investments on U.S. soil because of the plunge in oil prices. Sasol has spent years planning to expand its chemical factory outside Lake Charles, La., into a sprawling facility to turn natural gas into industrial compounds and diesel fuel. In October, the company committed $8 billion for equipment that produces ethylene, which is used to make plastics and other products. That plant is still going forward, but Sasol said on Wednesday that a bigger project, to use natural gas rather than crude to make diesel, is on hold. Plummeting oil prices have forced it to push back its own 2016 deadline for deciding whether to build […]