NiSource Inc. (NiSource) is an energy holding company whose subsidiaries provide natural gas, electricity and other products and services to approximately 3.8 million customers located within a corridor that runs from the Gulf Coast through the Midwest to New England. NiSource operates in three business segments: Gas Distribution Operations; Gas Transmission and Storage Operations, and Electric Operations. NiSource�s principal subsidiaries include Columbia Energy Group (Columbia), a vertically-integrated natural gas distribution, transmission and storage holding company whose subsidiaries provide service to customers in the Midwest, the Mid-Atlantic and the Northeast; Northern Indiana Public Service Company (Northern Indiana), a vertically-integrated gas and electric company providing service to customers in northern Indiana, and Bay State Gas Company (Columbia of Massachusetts), a natural gas distribution company serving customers in Massachusetts.