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MDU Resources Group Inc operates in three business segments, which include the 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.
Core Natural Resources Inc is a producer and exporter of coal. The company owns and operates longwall mining operations in the nation and export terminals on the Eastern seaboard. The principal activity involves mining, preparation, and marketing of thermal coal, sold to power generators.