Columbia Gas of Massachusetts is one of NiSource’s seven regulated utility companies. NiSource (NYSE: NI) is one of the largest fully-regulated utility companies in the United States, serving approximately 3.5 million natural gas customers and 500,000 electric customers. Columbia Gas of Massachusetts continues to grow as more businesses and homeowners convert from oil and electricity to natural gas. Today, natural gas satisfies 24 percent of our nation’s total energy demand and 18 percent of New England’s energy demand.