NiSource Inc., an energy holding company, operates as a regulated natural gas and electric utility company in the United States. The company operates through two segments, Gas Distribution Operations and Electric Operations. It provides natural gas service and transportation for residential, commercial, and industrial customers; generates, transmits, and distributes electricity; and wholesale and transmission transaction services. The company owns and operates two coal-fired electric generating stations with a capacity of 2,080 megawatts (MW); combined cycle gas turbine with a capacity of 571 MW; three gas-fired generating units with a capacity of 186 MW; and two hydroelectric generating plants with a capacity of 10 MW. It serves approximately 3.5 million natural gas customers in Ohio, Pennsylvania, Virginia, Kentucky, Maryland, and Massachusetts; and 476,000 electricity customers in the northern part of Indiana. The company was formerly known as NIPSCO Industries, Inc. and changed its name to NiSource Inc. in April 1999. NiSource Inc. was founded in 1847 and is headquartered in Merrillville, Indiana.