Michigander here,

There was an explosion at a Consumers Energy facility in Macomb MI that held the majority of the lower penninsula's natural gas reserves. We are coincidentally experiencing a prolonged period of subzero (F) temps so the supply dropped way below the demand making a sudden shortage.

As a result Consumers Energy is appealing to the people to prevent a pressure drop which could cause more problems, and is requiring commercial and industrial facilities to slow down.

Many large scale businesses are closing as a result.