NiSource is a fully regulated utility company providing natural gas and electric service to nearly 4 million customers across six U.S. states. Headquartered in Merrillville, Indiana, the company operates under the Columbia Gas and NIPSCO brands, serving residential, commercial, and industrial customers through an extensive network of distribution systems and pipelines built over more than 170 years.
The company's core operations centre on regulated utility services and significant infrastructure investment. NiSource focuses on pipeline operations and maintenance, distribution system management, and electric grid modernization. With approximately 7,700 employees, the organisation balances regulated earnings with ongoing capital investment in modern infrastructure and works closely with regulatory bodies to maintain service reliability and safety across its footprint.
NiSource traces its roots to 1847, with the modern company taking its current form through a 2000 merger. The company underwent a significant corporate restructuring in 2015 with the separation of Columbia Pipeline Group, allowing it to focus on its core regulated utility business. This structure supports long-term value creation for customers and shareholders while maintaining a commitment to infrastructure investment and regulatory partnership.