I believe 25% of the fuel for Michigan comes from that facility, this could really make things interesting.

The fire took place in the refinery's power house and led to a loss of cooling water that could potentially damage equipment, according to Bloomberg, but the extent of the problems are reportedly limited to a small area of the facility, and no injuries were reported.

The shutdown comes at an inopportune time, just ahead of the harvest in much of the Midwest, and U.S. gasoline supplies are at their lowest August levels since 2015, according to the Energy Information Agency.

The Whiting refinery is a major storage place for crude oil used to make gasoline, and its supplies could be moved to Cushing, Oklahoma, in the event of a long-term closure, according to Bloomberg.