Last November, Gov. Gretchen Whitmer ordered Enbridge Energy to shut down Line 5 by Wednesday.
But the Canadian energy company says that won't happen, arguing the Michigan governor is overstepping her bounds.
As a result, some protests and demonstrations are taking place near the Straits of Mackinac Wednesday and Thursday, in support of the shutdown order.
Meanwhile, GOP lawmakers are frustrated over Whitmer's shutdown order, saying it's just another political stunt by the governor and ignores the region's energy needs.