Shutting down the pipeline would cut off the Upper Peninsula from its supply of cheap propane, but clean energy advocates say there are better alternatives for heating.
The Chippewa tribe in northern Wisconsin says Enbridge could reduce the risk to the Great Lakes by diverting Line 5 oil to another line that runs south to Illinois.
A federal judge ruled against similar language in a South Dakota law last year that was deemed too vague.
A three-member board overseeing the tunnel project for the state is scheduled to hold its first meeting Wednesday.
The remaining six weeks of Michigan Gov. Rick Snyder’s eight-year term will be crucial for the Line 5 pipeline.