MDU Resources Group Inc.

MDU Resources Group, Inc. engages in the regulated energy delivery, and construction materials and services businesses in the United States. The company operates through Electric, Natural Gas Distribution, Pipeline and Midstream, Construction Materials and Contracting, and Construction Services segments. The Electric segment generates, transmits, and distributes electricity in Montana, North Dakota, South Dakota, and Wyoming. As of December 31, 2016, it served 142,948 residential, commercial, industrial, and municipal customers in 178 communities and adjacent rural areas. The Natural Gas Distribution segment distributes natural gas in Montana, North Dakota, South Dakota, and Wyoming, as well as Idaho, Minnesota, Oregon, and Washington; and offers related value-added services. It served approximately 922,408 residential, commercial, and industrial customers in 335 communities and adjacent rural areas. The Pipeline and Midstream segment provides natural gas transportation, underground storage, processing, and gathering services, as well as oil gathering and processing facilities in the Rocky Mountain and northern Great Plains regions. It also provides cathodic protection and other energy-related services. The Construction Materials and Contracting segment mines aggregates and markets crushed stone, sand, gravel, and related construction materials; and provides integrated contracting services in the central, southern, and western United States, as well as Alaska and Hawaii. The Construction Services segment constructs and maintains electric and communication lines, gas pipelines, fire suppression systems, and external lighting and traffic signalization equipment. This segment also offers utility excavation services, as well as electrical and mechanical services; and manufactures and distributes transmission line construction equipment and other supplies. MDU Resources Group, Inc. was founded in 1924 and is based in Bismarck, North Dakota.