DTE Energy is a Detroit-based electric and natural gas utility providing energy services, rebates, and renewable energy options to residential and business customers.

Black Hills Energy provides reliable electric and natural gas utility services, focusing on customer support, energy savings programs, and emergency preparedness.

NiSource is a utility holding company providing natural gas and electric transmission and distribution services to residential and commercial customers in the US.

Piedmont Natural Gas is a natural gas utility company that provides energy services with a focus on sustainability.