Delta Natural Gas Company, Inc. is engaged in distributing or transporting natural gas to approximately 36,000 customers. The Company operates in two segments: regulated segment and a non-regulated segment. Its distribution and transmission systems are located in central and southeastern Kentucky and it owns and operates an underground storage field in southeastern Kentucky. It transports natural gas to its industrial customers who purchase their natural gas in the open market and it also transports natural gas on behalf of local producers and customers not on its distribution system. It has three subsidiaries: Delta Resources, Inc., which buys natural gas and resells it to industrial or other customers on its system; Delgasco, Inc., which buys natural gas and resells it to Delta Resources and to customers not on its system, and Enpro, Inc., which owns and operates natural gas production properties and undeveloped acreage. It maintains an active natural gas supply management program.