Integrys Energy Group, Inc. is an energy holding company, which provides regulated natural gas and electricity, non-regulated renewable energy, and compressed natural gas products and services. The Company operates through four segments: natural gas utility, electric utility, electric transmission investment, and holding company and other. The natural gas utility segment includes the operations of Minnesota Energy Resources Corporation, Michigan Gas Utilities Corporation, North Shore Gas Company, The Peoples Gas Light and Coke Company and Wisconsin Public Service Corporation (WPS). The electric utility segment includes the electric utility operations of WPS. The electric transmission investment segment includes its 34% interest in American Transmission Company LLC. The holding company and other segment include the operations of the Integrys Energy Group holding company, Integrys Transportation Fuels, LLC, WPS Power Development LLC and the Peoples Energy, LLC holding company.