The parent company of all Columbia Gas locations is NiSource, and corporate headquarters are located at 801 East 86th Avenue, Merrillville, Indiana, 46410. Columbia Gas provides natural gas to around 4.3 million customers in Ohio, Pennsylvania, Maryland, Kentucky, Massachusetts, Virginia and Indiana.
It takes nearly 60,000 miles of pipeline to serve these residential, commercial and industrial customers across seven states. Because natural gas is abundant in North America, NiSource uses domestic supplies to provide service to their customers. In Northern Indiana, NiSource also provides electric service to approximately 500,000 customers, using generation sources of hydroelectric, coal, wind and natural gas for a total electric generating capacity of over 3,000 megawatts.