1847 – Springfield Gas Light Company founded
1885 – Manufacturers Natural Gas Company (now known as Columbia Gas of Pennsylvania) chartered
1906 – Columbia Gas predecessor companies formed
1912 – Northern Indiana Public Service Co. (NIPSCO) formed
1915 – Thirteen affiliated companies that previously operated separately are merged into Manufacturers Light & Heat. Operations are centered in Pennsylvania, West Virginia and Ohio
1941 - 1945 – 3,500 Columbia and NIPSCO employees serve in World War II
1948 – Company is renamed Columbia Gas System Inc.
1957-1962 – Central Kentucky Natural Gas becomes Columbia Gas of Kentucky; Manufacturers Light & Heat becomes Columbia Gas of Pennsylvania
1974 – Bay State Gas formed through the merger of Brockton, Taunton, Springfield, Northampton and Lawrence gas companies
1981 – Columbia acquires Commonwealth Gas Services (now known as Columbia Gas of Virginia)
2000 – NiSource and Columbia Energy Group merge, forming one of America’s largest gas and electric companies
2015 – NiSource and Columbia Pipeline Group separate, creating NiSource as a stand-alone utility company
2020 – Columbia Gas of Massachusetts sold to Eversource Energy