MDU Resources Group Inc operates in five business segments, which includes: Electric segment, which 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; The construction services segment provides a full spectrum of construction services through its electrical and mechanical and transmission and distribution specialty contracting services.