NiSource is an energy holding company. Through its subsidiaries, Co. is a natural gas and electric utility company. Co.'s reportable segments are: Gas Distribution Operations and Electric Operations. For its gas distribution operations, through its wholly-owned subsidiary, NiSource Gas Distribution Group, Inc., Co. owns distribution subsidiaries that provide natural gas to residential, commercial and industrial customers in Ohio, Pennsylvania, Virginia, Kentucky and Maryland. Through its electric operations, Co. generates, transmits and distributes electricity through its subsidiary, Northern Indiana Public Service Company LLC.