ORION TOWNSHIP, MI—A General Motors Co. manufacturing plant in Metro Detroit that was idled during the Detroit automaker’s federally induced bankruptcy is now one of the keys to GM’s future, reports The Detroit News. Orion Assembly is one of two plants where GM is investing $100 million in total to retool for Cruise AV production. The other is the Brownstown battery assembly plant, where roof modules for the Cruise AV are built.