NiSource Inc. is an energy holding company that owns and operates fully regulated natural gas and electric utility subsidiaries serving millions of customers across six states through two main segments: Columbia Operations, which provides natural gas distribution across the Mid-Atlantic and Midwest, and NIPSCO Operations, which operates gas and electric utilities in northern Indiana. The company generates revenue almost entirely from rate-regulated utility operations, with earnings derived from approved rate structures set by state utility commissions that include cost recovery mechanisms for fuel and operational expenses. In addition to core utility services, NiSource has begun offering customized electric service to data center customers through company-developed generation resources.