MDU Resources Group, Inc. is engaged in providing essential products and services through its regulated energy delivery businesses. The Company’s segments include Electric, Natural gas distribution, Pipeline, and Other. The Electric segment generates, transmits and distributes electricity in Montana, North Dakota, South Dakota and Wyoming. The Natural gas distribution segment distributes natural gas in those states, as well as in Idaho, Minnesota, Oregon and Washington. The Pipeline segment provides natural gas transportation and underground storage services through a regulated pipeline system in the Rocky Mountain and northern Great Plains regions of the United States. This segment also provides non-regulated energy-related services, including cathodic protection. Its Other segment includes the activities of Centennial Capital, which, through its subsidiary InterSource Insurance Company, insures various types of risks as a captive insurer for certain of the Company's subsidiaries.