Serving more than 821,000 natural gas customers and 468,000 electric customers across the northern third of Indiana, Northern Indiana Public Service Company (NIPSCO) is the largest natural gas distribution company, and the second largest electric distribution company in the state. Headquartered in Merrillville, we're one of the six energy delivery companies of NiSource, who together provide essential natural gas and electric service to more than 4 million customers.