MDU Resources Group, Inc. operates as a natural resource company in the United States. It has six segments: Electric, Natural Gas Distribution (NGD), Construction Services, Pipeline and Energy Services (PES), Natural Gas and Oil Production (NGOP), and Construction Materials and Mining (CMM). The Electric segment generates, transmits, and distributes electricity in Montana, North Dakota, South Dakota, and Wyoming. The NGD segment distributes natural gas in western Minnesota and southeastern North ...